Live Weight Of Broiler Chickens Research Articles

Influence of phytobiotics dose on feed conversion in broiler chickens

The inclusion of Chaga decoction in the compound feed for broiler chickens in the amount of 20 mg, 40 and 60 mg/kg of live weight of the broilers during the entire period of its rearing had a different influence on the digestibility and use of nutrients in the diet. The results of the physiological experiment at the age of 3 weeks of broilers showed that a small dosage of the phytobiotic compared with the control group stimulated an increase in the digestibility of crude protein in the feed by 4.05 abs.%, crude fat by 1.92 abs.%, crude fiber by 1.21 abs.%. With the increase in the dosage of the phytobiotic in the broiler compound feed, the increase in the digestibility of crude fi ber by 2.01–2.12 abs.% was noted. Nitrogen digestibility in poultry with a low rate of Chaga decoction introduction exceeded the control group by 0.16 g, and other experimental groups by 0.13–0.14 g. As a result, the average daily nitrogen deposition in the body of broiler chickens in the group with a low rate of phytobiotic introduction was 2.53 g or 16.1 % higher than in broilers in the control group and 2.3–3.2 % higher than in other experimental groups. At the fi nal stage of broiler chicken rearing, the digestibility of crude protein in the diet of broiler chickens of the 1st experimental group with a low dosage of phytobiotic was higher than in the control group by 3.17 abs.%, crude fat by 4.15 abs.%, crude fi ber by 2.60 abs.%, and nitrogen-free extractive substances by 0.17 abs.%. In broilers of other experimental groups this diff erence was less expressed. A decrease in nitrogen losses with undigested substances in the droppings of broilers of the 1st experimental group increased its deposition by 5.7 %, in other experimental groups only by 0.9–2.1 %. Analysis of the dynamics of live weight of broiler chickens during the rearing period showed that the 1st experimental group with the low dosage of Chaga decoction in the diet increased the absolute gain in live weight in comparison with the control group by 5.0 %, with the 2nd experimental group by 3.4 % and with the 3rd experimental group by 1.4 %, and feed costs accordingly by groups decreased by 4.7 %, 3.2 and 1.5 %.

Mathematical justification of the optimal rate of selenium introduction into mixed feed for broiler chickens

In recent years, many countries worldwide have been revising the existing standards for introducing trace elements in mixed feed for high-performance crosses and poultry breeds, taking into account new scientific data. This also applies to Selenium, which is recognized as an indispensable biotic ultramicroelement according to the modern classification. The norms for introducing selenium into mixed feed for broiler chickens have specific differences and range from 0.1 to 0.5 mg/kg of feed, which are recommended in different countries and at other times. The reason for the disagreement is probably that the experiments were conducted under different conditions, against the background of different diets, on different poultry crosses, and using other selenium-containing compounds. In addition, the norms of selenium additives recommended by foreign and domestic scientists in mixed feed for broiler chickens are not always supported by mathematical calculations, and, in our opinion, they should be evaluated as indicative, requiring further justification and clarification depending on the regional characteristics of poultry feeding. Two scientific and economic experiments were conducted to determine the optimal rate of introducing selenium into mixed feed for broiler chickens, which lasted 42 days each. The study was conducted on broiler chickens of the Coob 500 cross. Selenium was additionally introduced into mixed feeds for broiler chickens of the experimental groups in doses of 0.2, 0.3, 0.4, and 0.5 mg/kg. Poultry in the control group did not receive Selenium supplementation. Statistical processing of experimental data obtained in two scientific and economic experiments, using graphical, variance, and regression analysis methods, allows us to conclude that the optimal dose of Selenium administration in mixed feed for broiler chickens should be considered 0.3 mg/kg. Feeding broiler chickens during the growing period of mixed feed enriched with Selenium in this amount contributed to a likely increase in their live weight in the first experiment by 7.8 % (Р < 0.001), in the second by 5.1 % (Р < 0.01), compared to the control group. Higher doses of Selenium (0.4 and 0.5 mg/kg) in mixed feed, as well as a lower dose (0.2 mg/kg), caused less intensive growth and lower live weight of broiler chickens of other experimental groups, compared to young animals fed mixed feed with the addition of selenium 0.3 mg/kg.

Phitosomin drug and its use in poultry farming

Solving the problem of normalizing metabolic processes and the morphological and functional state of the liver in poultry through the use of pharmacological agents seems to be an important reserve for increasing the effi ciency of industrial poultry farming and food production. Promising in this regard are studies on the development of medicines based on plant resources, which are characterized by structural diversity, multifunctionality of pharmacological action and low toxicity. The purpose of the research was to develop the liposomal drug Phitosomin, study its pharmacological and toxicological properties and substantiate the eff ectiveness of its use in poultry farming. Biopharmaceutical research has been carried out to develop a liposomal drug for veterinary use with a multifunctional pharmacological eff ect. The component composition of the drug Phitosomin represented by lecithin, dihydroquercetin, extracts of milk thistle, common agrimony and hare’s-ear, has been substantiated. A liposomal dosage form of the drug has been developed. Its physicochemical properties and shelf life have been established. The toxicological characteristics of the drug Phitosomin were studied, which made it possible to determine the degree of safety of its use in rearing of broiler chickens. Data were obtained experimentally on the pharmacological eff ects of Phitosomin on laboratory animals and broiler chickens when modeling various pathologies. The pharmacodynamic eff ect of the drug on blood parameters and productive traits of broiler chickens has been established, and the eff ective dose of its use in rearing broiler chickens has been determined. It was established as a result of the production inspection that when Phitosomin was introduced into the main diet of poultry of the experimental group at a dose of 5 g/kg of feed during the growth and finishing periods of feeding, there was an increase in the live weight of broiler chickens by 12,6 % and the livability of livestock by 1,6 abs.% compare with the control group.

Effect of probiotic biopreparation on fatness, organoleptic, and chemical parameters of broiler chicken meat

The relevance of this study was to use the probiotic biopreparation Subtiform in the production of broiler chickens to increase productivity and improve the organoleptic and chemical characteristics of poultry slaughter products. The purpose of this study was to determine the effect of a probiotic biopreparation on the fatness of broiler chickens, the chemical composition of meat and chemical parameters using the developed patented express and optimised methods. The following methods were used: physical, organoleptic, chemical. It was found that the use of Bacillus subtilis and Bacillus licheniformis (2.5×109 CFU/g) with whey powder filler increased productivity, specifically, the live weight of broiler chickens increased by 4.02% (P<0.001) when fed at a dose of 2.0 g/10 dm3 of water and by 4.75% (P<0.001) in experiment 3 compared to the control group. An increase in indicators in the experimental group 3 was found, namely, the average daily weight gain of carcasses – by 8.33% (P<0.001); total weight of the bird carcass and neck giblets – by 26.48% (P<0.001); weight of internal fat – by 1.89 times (P<0.001) compared to the control. Statistical significance (P<0.001) was also found in the increase in the weight of internal organs (stomach, liver, heart, adrenal gland) in experimental groups 2 and 3 compared to the control. The improvement in organoleptic and tasting characteristics of poultry meat and meat broth after feeding the probiotic preparation, specifically in experimental group 3, was summarised. The obtained quantitative and qualitative chemical parameters using express and optimised methods indicated the freshness of broiler chickens meat at (0-4)°C cooling, at which it is allowed to sell poultry carcasses up to 5 days, of control and experimental groups 1, 2, 3. The practical value of this study lies in the use of a probiotic biopreparation by veterinary specialists at broiler chick production facilities to increase the productivity of broiler chickens and improve the quality and safety of their slaughter products

КОРМОВАЯ ДОБАВКА НА ОСНОВЕ КРЕМНИЯ В РАЦИОНЕ ЦЫПЛЯТ-БРОЙЛЕРОВ

The use of a silicon-based feed additive at a dose of 0.1% in the diets of broiler chickens leads to an increase in the live weight of broiler chickens at the end of the experiment. The silicon-based feed additive ensures asynchronous growth of internal organs depending on the dosage, contributing to an increase in growth.

Гистологические показатели мышц цыплят-бройлеров при применении в рационе кормовых добавок

The article presents the results of studying the effect of feed additives «HitAcid» and «Veleguard BG» on the histological parameters of the muscles of broiler chickens of the Ross-308 cross. The study was conducted at the Department of Parasitology and Veterinary and Sanitary Expertise of the Federal State Budgetary Educational Institution of Higher Education «Moscow State Academy of Veterinary Medicine and Biotechnology – MVA named after K. I. Skryabin». During the study, it was found that the use of additives «HitAcid» and «Veleguard BG» stimulate the set of live weight of broiler chickens, and show an increase in the set of muscle mass of carcasses. Indicators of the thickness of muscle fibers and bundles of muscle fibers of the quadriceps femoris and superficial pectoral muscle of broiler chickens of the experimental groups exceed those of the control group. In a comparative assessment of the micromorphometric parameters of the studied muscles, the greatest thickness of muscle fibers and bundles of muscle fibers was noted in the experimental group «HitAcid». The data obtained indicate the expediency of using food additives based on organic acids in the diet of broiler chickens.

Productivity, metabolites of blood serum lipid metabolism and chemical composition of the broiler chicken liver on the background of feeding emulsifiers

Emulsifiers are used in animal nutrition to improve fat emulsification and increase absorption. The liver is the central organ controlling lipid homeostasis. The aim of the research was identification the effect of feeding various types of substances with emulsifying properties: soy lecithin and Lesimaks Premium feed additive on productivity, metabolites of lipid metabolism in blood serum and the chemical composition of the liver of broiler chickens. Our studies show the effectiveness of "Lesimaks Premium" to a greater extent in comparison with soy lecithin. By the end of the experiment, the lead in live weight of broiler chickens compared to the control was 7.9%. In the experiment, both emulsifiers changed the fatty acid composition of the liver, while oleic acid increased and linoleic acid decreased in the liver, against the background of an increase in HDL and a decrease in serum LDL. The study highlights the promising potential for improving broiler performance through the use of emulsifiers in diets.

Effect of mineral feed additive on productivity of broiler chickens

Mineral elements play an essential role in the metabolic processes carried out in the animal body at the cellular level. They support homeostasis, acid-base balance, and osmotic pressure. Lack of mineral elements leads to disturbances in metabolic metabolism, reduced productivity, and increased morbidity in poultry. Therefore, the research aimed to establish the effect of selenium-containing feed additives on broiler chickens' live weight, gains, feed consumption, slaughter, and hematological indicators. Selenium – exchanges proteins, fats, and carbohydrates to regulate enzymatic and redox reactions. The introduction of selenium into animals' rations contributes to the normalization of metabolism, preventing the accumulation of toxic oxidation products and damage to the cell membrane. The experiment lasted 42 days. Two groups of Ross-308 cross-broiler chickens, 20 heads each, were selected for the experiment. In addition to compound feed, the second experimental group used a mineral feed additive at the rate of 100 g per 1 ton of compound feed. When broiler chickens were fed a mineral feed additive, live weight increased by 4.9 %, average daily weight gain by 4.8 %, and absolute weight gain by 5.0 %, relative to control counterparts. It was established that using a mineral feed additive in feeding broiler chickens of the 2nd group, the consumption of feed per 1 kg of growth decreased by 9.0 %, compared to control analogs. It was found that the pre-slaughter live weight of broiler chickens of the 2nd group increased by 5.0 %, the weight of non-carcass carcass by 5.6 %, half-carcass by 5.5 %, and carcass weight by 6.2 %, compared to the control value. In addition, under the influence of the studied feed additive, the mass of the pectoral muscles in broilers of the 2nd group increases by 16.0 % (Р ≤ 0.05) and thigh muscles by 36.0 % (Р ≤ 0.001) relative to control indicators. It was found that in the broilers of the 2nd group, under the influence of the additive, the slaughter yield of the thigh muscles increased by 29.4 % (Р ≤ 0.05) compared to the control group. It was established that under the action of the mineral supplement, the level of hemoglobin in broiler chickens of the 2nd group increased by 5.3 % (Р ≤ 0.05) relative to the control value.

Saving and productivity of broiler chickens for feeding an optimal dose of zinc proteinate

On the basis of conducted scientific research, it was set that the use of inorganic salts of trace elements in animal and poultry feed leads to environmental pollution with heavy metals due to their low biological availability for the animal organism. Therefore, in recent years, a number of investigations have been conducted to study the effectiveness of using organic trace elements in animal and poultry feed. The article deals with the results of a scientific and economic experiment on the investigation of the influence of domestically produced zinc proteinate in combination with zinc sulfate on indicators of preservation, growth intensity and feed conversion in broiler chickens. Broiler chickens of the control group were fed with a complete ration balanced in terms of necessary nutrients, in accordance with the age periods of the growth of the poultry, with the addition of 50 g per ton of zinc sulfate. Then, the broiler chickens of the research groups were received the same compound feed, but with the addition of 50 g and 30 g per ton of zinc proteinate compound feed. The live weight of broiler chickens of the research groups was significantly higher than the control. At the age of one week, it tended to increase in the chickens of the 2nd and 3rd research groups, and at the age of 14, 21, 28, 35 and 42 days, the live weight of the chickens of the 3rd research group exceeded the live weight of the poultry of the control group, respectively , by 15.8 g (Р < 0.05); 37.0 (P < 0.01); 96.8 (P < 0.05); 115.9 (P < 0.01) and 177.7 g (P < 0.05), or by 4.7 %, 4.6, 7.6, 6.5 and 7.1 %, while the chickens of the 2nd research group at this time exceeded the control group chickens in terms of live weight, but were slightly behind the peers of the 3rd research group. The researched doses of zinc proteinate contributed to the increase in the preservation of poultry stock by 4–5 %, the average daily weight gain of broilers in the research groups compared to the control, respectively, by 5.1–7.2 %. The European index of efficiency of broiler chickens growing for zinc proteinate feeding was increased by 48.4 and 76.7 units compared to the control group which were fed with zinc sulfate and at the same time feed costs per 1 kg of growth was decreased by 2.4–3.2 %.

Effect of additives with chelated forms of trace minerals on growth performance of broiler chickens, feed nutrient digestibility, and carcass characteristics

Demand for chicken meat has been growing in recent years, requiring prominent production levels and efficient feed conversion. The purpose of this study was to determine the productivity, preservation, and slaughter performance of broiler chickens, feed conversion on the background of feeding with additives with chelated forms of trace minerals. Poultry growth intensity was determined according to zootechnical methods, slaughter indicators – according to morphological methods, and statistical analysis of the results was used. By the end of the rearing period, the live weight of broiler chickens in the groups where the dietary supplement with chelated trace minerals (second group) and copper chelate complex (third group) was significantly higher than in the control group – by 6.9% and 13.8%, and the relative increase was 4.5 percentage points and 8.5 percentage points, respectively. The growth rate of broilers in terms of average daily weight gain is higher in these groups by 6.8% and 14.2%, respectively. The safety of poultry in the experimental groups is 4% better than in the control group. The feed conversion of a diet with chelated trace element additives is higher. Feed consumption in the experimental groups was reduced by 2.8% when feeding the selected additive and by 9.7% when feeding the copper chelate complex. The results of balance studies revealed an increase in the digestibility of nutrients in the diet of broiler chickens. Additives with micronutrient chelates are effective in increasing slaughter yield, meatiness of the thighs and shins, and pectoral muscles by 5.3-6.2 percentage points. The broilers of the experimental groups had a higher meatiness of the thighs and shins. The highest growth rate was found in broilers fed a copper chelate complex in their diet. The lower feed conversion in the control group is due to the lower body weight of these chickens. Based on the research data obtained, the possibility of effective introduction of additives with chelated microminerals into the diet of broiler chickens was established, which helped to increase the growth rate and meat yield. The results can be used in farm poultry farms to produce more products and reduce the cost of chicken production

Changes in the indicators of the intestinal normoflora of broiler chickens when L–asparaginates and Phytases are added to the feed

In 2021, in the vivarium of the FNC "VNITIP" of the Russian Academy of Sciences, an experiment was conducted on 4 groups of broiler chickens of the SGC "Smena 8" breeding with the use of a mineral supplement in the form of Lasparaginates in the amount of 7.5% of the accepted norms, both with and without phytase. As a result, it was found that Lasparaginates and microbial phytase contributed to the enhancement of biological activity, providing better assimilation of metals. With a low proportion of lactobacilli in the intestinal flora of broiler chickens of all groups, there was a tendency to increase them in the fourth group of birds that received 7.5% of L-asparaginates from the accepted norms in combination with phytase in the diet.phytase in the diet. Among the cellulolytic bacteria in the intestinal microbiome, the highest rates were found in the first and third groups of broilers that received both an inorganic form of mineral supplement in the form of premixes (the first group) and organic, in the form of L-asparaginates in combination with phytase (the third group), which compensated for the low proportion of lactobacilli in the intestines of birds of these groups. The obtained results testified to the positive effect of the studied mineral supplement and phytase on the safety indicators, the live weight of broiler chickens and the microflora of their intestines.

INFLUENCE OF COUMARIN ON PRODUCTIVITY, IMMUNITY AND ANTIOXIDANT STATUS OF HEALTHY BROILERS

Background. Coumarins are natural compounds (secondary metabolites of plant origin) that have a wide range of biological activity, mainly due to their ability to interact with various enzymes and receptors in living organisms. The relevance of their use in feeding poultry is obvious, in view of the active search for alternatives to feed antibiotics.
 The aim of the study was to evaluate the effect of coumarin on the productivity and antioxidant status of broiler chickens.
 Materials and methods. Objects of study: broiler chickens of the Arbor Acres cross, 7-hydroxycoumarin. The experiment was carried out on 180 heads of 7-day-old broiler chickens (n=45). Control - the main diet (OR), 1 experimental – OR + coumarin (at a dose of 1 mg/kg of feed/day, 2 experimental – OR + coumarin at a dose of 2 mg/kg of feed / day, 3 experimental – OR + coumarin in at a dose of 3 mg/kg feed/day. Hematological parameters (number and type of leukocytes) were taken into account on an automatic hematological analyzer URIT-2900 Vet Plus (URIT Medical Electronic Group Co., Ltd, China). Biochemical analysis of blood serum was performed on an automatic biochemical analyzer CS-T240 (Dirui Industrial Co., Ltd, China).
 Results. The inclusion of 7-hydroxycoumarin in the diet contributed to an increase in live weight in the experimental groups by 8,6–19,4%; (by 9,2–21,1%), slaughter yield (up to 4,76%), against the background of a decrease in feed consumption per 1 kg of live weight gain (by 3,5–15,7%). showed a decrease in total protein, albumin, ALT (groups 1 and 2 (p≤0,05)), bilirubin (by 38,3–68,6%), cholesterol (in group 3 by 16,4% (p≤0,05)), triglycerides (groups 1 and 2, p≤0,05), urea (41,8–65,1%; p≤0,05), against the background of elevated iron levels (groups 1 and 2, p≤0,05). Depending on the dose of 7-hydroxycoumarin, a decrease in the number of leukocytes (group 1, p≤0,05), neutrophils (groups 1 and 2, p≤0,05), monocytes, eosinophils and basophils (p≤ 0,05). Antioxidant indicators were characterized by a decrease in the level of malondialdehyde (by 63,7–77,3%), superoxide dismutase activity (22,4–71,5%) and an increase in catalase activity (by 24,3–46,1%).
 Conclusion. Thus, the inclusion of 7-hydroxycoumarin (2 mg/kg feed/day) in the diet contributed to an increase in the live weight of broiler chickens, feed intake, slaughter yield, against the background of a lower feed consumption per 1 kg of live weight gain; had a positive effect on the parameters of the liver (ALT, total bilirubin), lipid and nitrogen metabolism (triglycerides, urea), the antioxidant status of the body of broiler chickens.

Efficiency of using fodder meal of animal origin in the rearing of broiler chickens of the Ross-308 cross

Studies on the effectiveness of the use of fodder meal of own production prepared from poultry waste as an ingredient of diets for feeding broiler chickens are presented. Scientific-economic and physiological experiments were carried out under production conditions in the Novosibirsk region in 2021, 2022. The object of the study were broiler chickens of the Ross-308 cross from 5 to 40 days of age. In the diet of the control group meat and bone meal in the amount of 5% of the diet structure was used, which in the two experimental groups was replaced by animal fodder meal of own production sterilized at different temperature regimes. In the 1st experimental group young animals consumed fodder meal sterilized at 135 °С, in the 2nd experimental group - at 150 ◦С. Sterilization was carried out in the boiler BC 10,000. The data obtained indicate that the live weight of broiler chickens was high in all groups, with the young birds of the control and 1st experimental groups significantly exceeded the 2nd experimental group by 3.1 and 2.6% (p <0.05) in terms of live weight. Energy of growth, keeping stock and feed expenses were close in all groups and were at the level of 71.1-73.4 g, 97.0-98.0% and 1.49-1.56 kg per 1 kg of growth respectively. Digestibility of crude protein and fat was high, differences between groups were insignificant. Digestibility of crude fiber was almost the same in the control and 1st experimental groups, in the 2nd experimental group it decreased by 1% relative to the control (p < 0.05). The maximum slaughter yield of meat (75.8%) was observed in the 1st experimental group, while in the control group this indicator was slightly lower (by 2.3%). In the 2nd experimental group, it was lower compared to the control and 1st experimental groups by 3.0 (p < 0.05) and 4.3% (p < 0.01), respectively. In the 2nd experimental group, the productivity index was lower compared to the other groups. Economic efficiency was high in all groups, but production efficiency increased by 16% when feed flour sterilized at 135 0C was fed to young animals.

The use of oilseed processing products in compound feed for poultry and aquaculture

Recently, the oil processing industry has been actively developing in the Lower Volga region, the by-products of which are presscake and extracted meal. The purpose of our research was to study the infl uence of feeding local non-traditional feed sources as part of compound feed on the live weight of broiler chickens and rainbow trout. Studies on broiler chickens of the cross Ross 308 were carried out at the Research Center for the safety and eff ectiveness of feed and Additives of the Volgograd State Agrarian University. The chickens of the control group received compound feed with sunfl ower presscake, and in the diet of poultry of the 1st, 2nd and 3rd experimental groups sunfl ower presscake was replaced with amaranth presscake – 50, 75 and 100 %, respectively. Scientifi c and economic experiment on the study of the possibility of including protein concentrate Gorlinka in compound feed for rainbow trout was carried out at the enterprise SO Kalmykova I. O. The fi sh of the control group received compound feed with sunfl ower extracted meal, and individuals of the 1st, 2nd and 3rd experimental groups received compound feed, in which sunfl ower extracted meal was replaced by Gorlinka concentrate – 50, 75 and 100 %, respectively, by groups. It was concluded on the base of conducted studies that the introduction of amaranth presscake into the formula of compound feed had a positive eff ect on the meat productivity of broiler chickens of the cross Ross 308. So, during the period of the experiment the live weight of poultry was increased by 2,15–5,26 %, and the slaughter yield increased to 0,29 abs.%. The use of mustard protein-containing concentrate Gorlinka in compound feed for rainbow trout contributed to the increase in the total live weight gain by 2,83–6,93 %.

Growth-stimulating and antioxidant effects of vanillic acid on healthy broiler chickens.

Phytobiotics are a safe alternative to feed antibiotics in industrial poultry farming that increases productivity by stimulating various digestive enzymes to reduce the number of pathogenic microorganisms in the intestines and improve antioxidant status and immune response. This study aimed to evaluate the effect of vanillic acid in its pure form and in combination with gamma lactone on weight growth and the physiological parameters of broiler chickens. The studies were performed on 120 Arbor Acres broiler chickens (7 days old) that were randomly divided into four groups with five replicates (cages) and six birds per replicate. The control group was fed the basal diet (BD) only. Group I was fed the BD + gamma lactone (average dose 0.07 mL/animal/day). Group II was fed the BD + vanillic acid (average dose 0.07 mL/animal/day). Group III was fed the BD + gamma lactone + vanillic acid in a 1:1 ratio (average dose 0.07 mL/body/day). Live weight of broiler chickens for all group was assessed at the end of each period (age of 7, 14, 21, 28, 35, 42 days). At the end of the experiment (on day 42), 10 broilers with an average live weight were selected for blood sampling from the axillary vein. The results showed a growth-promoting effect of vanillic acid when fed with a diet free of synthetic antioxidants. Groups I and II had increased live weights throughout the entire experiment and a significant increase at the end of the experiment (8.2%-8.5%; p ≤ 0.05) compared to the control group. Toxic effects were not found in the biochemical blood serum analyses of Groups II and III. The metabolic processes in the experimental groups were intensified, especially in the enzyme associated with amino acid metabolism (gamma-glutamyl transferase) in Groups I and III (p ≤ 0.05). Vanillic acid, whether fed alone or in combination with gamma lactone, exhibited high antioxidant activities, protected cells from oxidative damage by inducing total antioxidant, catalase, and superoxide dismutase activities (p ≤ 0.05), and reduced the level of malondialdehyde (p ≤ 0.05) measured. No significant changes in the morphological blood parameters were found. The use of vanillic acid alone and in combination with gamma lactone increases the digestive enzyme activities in blood plasma, increases body weight, and has a positive effect on lipid metabolism and the antioxidant status of broiler chickens. These findings indicate the significant potential use of vanillic acid and gamma lactone in poultry due to their antioxidant properties.

Опыт применения отечественного витаминно-минерального комплекса и его влияние на биологическую полноценность продуктов убоя цыплят-бройлеров

The article considers the issue of increasing the biological usefulness of the products of slaughter of broiler chickens when using domestic feed additives in the diet. It has been established that the vitamin and mineral complex «Productive® Forte» has a positive effect on the dynamics of the live weight of broiler chickens, while the mass of edible parts increases. We noted a higher protein content in the pectoral and femoral muscles of broiler chickens, as well as an increase in the content of polyunsaturated fatty acids. The vitamin content in the liver of broiler chickens of the experimental group significantly exceeds the control.

Productivity of broiler chickens using the optimal dosage of zinc proteinate

According to the results of the conducted research, a positive influence of the use of zinc proteinate on the dynamics of live weight and average daily growth of broiler chickens was set. The advantages of using zinc proteinate over sulfate are shown, and the defined prospects of its use in the content of compound feed for broiler chickens are determined. As a result of the conducted research, it was found that feeding zinc proteinate makes it possible to reliably increase the live weight and average daily growth of broiler chickens in different age periods of their growth. Thus, using zinc proteinate in doses corresponding to the input of 50 and 30 g of the element per 1 ton of compound feed increases the live weight of broiler chickens of the second and third experimental groups by 125.7 and 177.7 g or 5.1 and 7.2 %. The average daily weight gain for the entire growing period was: in chickens of the first control group, 58.4 g, in the second experimental group – 61.4 g, and in the third experimental group, 62.6 g. According to the results of the conducted scientific and economic experiment, it was set that the use of zinc proteinate in a dose corresponding to 30 g of the element per 1 ton of compound feed contributes to better use of feed nutrients, which leads to a probable increase in the average daily growth of broiler chickens starting from the second decade of cultivation while reducing costs fodder. Using zinc proteinate in a dose corresponding to 50 g of the element per 1 ton of compound feed also contributes to better use of feed nutrients. However, it leads to a probable increase in the average daily growth of broiler chickens only starting from the third decade of cultivation. According to the results of control weighings, it was found that the live weight of broiler chickens of experimental groups 2 and 3 began to exceed the live weight of broiler chickens of the control group starting from 14 days of age and until the end of fattening (Р < 0.05). The research showed the advantages of introducing zinc to compound feed in the form of proteinate over sulfate. The dose corresponding to introducing 30 g of the element per 1 ton of compound feed is more effective.

Продуктивное влияние новых сортов сурепицы при выращивании цыплят-бройлеров

Studies have been carried out to determine the effect of seeds of varieties of coleseed (Brassica rapa L.) on the productivity of broiler chickens of the "Cobb 500" cross. According to the scheme of the experi-ment, the control compound feed did not contain coleseed seeds, 7.5% (by weight) were taken into the compound feed of the first experimental group seeds of winter coleseed of the Zarya variety, and in the compound feed of the second experimental group — 7.5% seeds of spring coleseed of the Nadezhda va-riety. The introduction of coleseed seeds into the starting and finishing compound feeds for broiler chick-ens reduced the use of soybean meal and sunflower oil by 3.7 and 4.0% (rel.). The data of physiological experience showed that the digestibility of the nutrients of the compound feed of all groups was at a high level. The digestibility of crude protein was at the control level. Lower digestibility of raw fiber by chick-ens of the first experimental group (less by 3.06%) is associated with a higher content of lignin in the seed shell of the Zarya variety. By the end of the experiment, the live weight of broiler chickens increased 66.8 times, 66.4 times and 66.9 times, respectively, according to the control of the first and second experimen-tal groups. Inclusion of coleseed seeds (7.5% by weight) slightly reduced the consumption of compound feeds by chickens of the experimental groups — by 1.43 and 1.13%, compared with the control. This was facilitated by the higher energy saturation of experimental compound feeds with coleseed seeds, contain-ing a high level of crude fat. The reduction in the use of compound feed and its lower cost affected the efficiency of growing an experienced bird. The efficiency index of poultry meat production by groups in the control was 97.62% and 113.41, 114.54% in the 1st and 2nd experimental groups, respectively.

THE EFFECTIVENESS OF ADDING SEAWEED TO FEED IN REDUCING FAT AND CHOLESTEROL LEVELS IN BROILER CHICKENS

This study aims to determine the effectiveness of adding seaweed to feed in reducing fat and cholesterol levels in broiler chickens. This type of research is experimental. This research method used a completely randomized design (CRD) consisting of 4 treatments with three replications. The treatments given were Ration without the addition of seaweed (K), R1 (Ration with the addition of seaweed 7 %), R2 (Ration with the addition of 9% seaweed), and R3 (Ration with the addition of 11%). The parameters observed were a decrease in meat fat content, a decrease in cholesterol levels, and the live weight of broiler chickens. Fat content was measured using the Soxhlet method, and cholesterol levels were measured using the Esey Touch GCU. The data analysis technique used is the Analysis of Variance (ANOVA) at the confidence level = 0.05; if the ANOVA results show a significant difference, proceed with Duncan's further test. The results showed that adding seaweed to the feed reduced broiler chickens' fat and cholesterol levels. Treatment with the addition of 7% seaweed reduced the fat content of the meat and cholesterol levels in broiler chickens and did not reduce the live weight of broiler chickens. Meanwhile, the 9% and 11% treatments reduced meat fat content, cholesterol levels, and reduced live weight of broiler chickens. So it can be concluded that the addition of 7% seaweed proved effective in reducing broiler chickens' fat and cholesterol levels.

Meat productivity of broiler chickens depending on the conditions of keeping and feeding when using microbial additives in the diet

The publication presents the results of the study of the influence of conditions of keeping and feeding with the use of a microbial feed additive in the diet of broiler chickens of the Ross 308 cross. The birds were kept both in the outdoor way and in cages. The additive is a lyophilized mass of beneficial microorganisms (Bifidobacterium lactis, Lactobacillus acidophilus, Streptococcus thermophilus, Lactobacillus delbrueckii ssp. bulgaricus) and vegetable fillers (edible citrus fiber and maltodextrin). The conducted scientific, production and laboratory studies have demonstrated that the conditions of broiler chickens did not have a significant impact on the studied parameters, however, the use of probiotics in the poultry diet contributed to the improvement of the safety, live weight and meat productivity of the cross. It was found that the safety of the experimental poultry contained by outdoor and cage methods, which additionally received the studied microbial additive in the diet, increased compared to similar groups, but without additives by 4.0 and 6.0 %, the live weight of broiler chickens on the last day of the experiment was 5.5 and 5.6 % more, there was also a decrease in feed costs by 1.0 kg of poultry growth by 3.9 and 4.4 %. The use of microbial additive contributed to an increase in the slaughter yield of the gutted carcass of experimental groups of broiler chickens by 3.2-4.0 % with statistically significant differences in the mass of the body parts of experimental birds compared with control groups.