Hen Meat Research Articles

Physical Characteristics, Moisture Content and Organoleptic Properties of Afkir Laying Hen Meat with Different Marination Durations in Pineapple Crown Extract

Afkir laying hen meat has a tough texture, making it less desirable to consumers. Pineapple crown extract is known to improve the texture of spent laying hen meat due to its bromelain enzyme content. This study aims to determine the effect of marination duration using pineapple crown extract on the pH, cooking loss, water content, water holding capacity, texture, and organoleptic value of spent laying hen meat. The study was conducted using a Completely Randomized Design with 4 treatments (different marination times of 0, 2, 4, and 6 hours) and 5 replications. The parameters observed in this study included pH, cooking loss, water content, water holding capacity, texture, and organoleptic values. Test data were analyzed statistically using Analysis of Variance with a 5% significance level, and if significant effects were found, the analysis was followed by Duncan’s Multiple Range Test. Organoleptic test data were analyzed with the Kruskal-Wallis method, and if there were significant effects, further analysis was conducted using the Mann-Whitney test. The results showed a significant effect (P<0.05) of marination time using pineapple crown extract on the pH, water content, and organoleptic parameters, including taste, texture, color, and overall preference, with no significant effect (P>0.05) on cooking loss, water holding capacity, or the aroma attribute in the organoleptic test. Marination time also decreased the toughness of afkir laying hen meat texture, as analyzed descriptively. Marination for 2-6 hours decreased pH and water content, tenderized the texture, and improved meat preference. Keywords: Afkir laying hen; bromelain; tenderness; pineapple crown; marination

Effect of NaCl partial replacement by KCl, Ca-ascorbate, and spent hen meat hydrolysate on the physicochemical properties and quality of Cantonese sausage.

A large amount of NaCl is usually used to provide a unique flavor and extend the shelf life of meat products. However, excessive sodium intake may cause diseases such as cardiovascular diseases. Spent hen meat hydrolysate (SHH) as an efficient NaCl substitute was developed with inefficient research related to SHH application in food systems. Therefore, the effects of NaCl replacement with SHH, KCl, and Ca-ascorbate on the quality of low-sodium Cantonese sausage were investigated. Four groups of salt formulation, I (100% NaCl), II (NaCl/KCl/Ca-ascorbate=60%/30%/10%), III (NaCl/KCl/Ca-ascorbate/SHH=50%/30%/10%/10%), and IV (NaCl/KCl/Ca-ascorbate/SHH=30%/30%/10%/30%), were used to produce Cantonese sausages. The moisture and nitrite content decreased, the microbiological growth was inhibited, and the protein content increased after adding SHH for Cantonese sausages with NaCl substitution degrees of 50% and 70%. The saltiness, overall flavor, color, and texture of low-sodium Cantonese sausages with SHH were maintained or improved compared to the Cantonese sausage without sodium replacement. The proportion of peptides with molecular weight<1kDa in Cantonese sausages increased after adding SHH, which may improve the overall flavor by interacting with peptides or other compounds. SHH combined with KCl and Ca-ascorbate is an efficient NaCl substitute, which can maintain and even improve Cantonese sausage quality and reduce sodium content up to 70%. These findings offer a promising reference for SHH application in the food industry and promote the development of salt taste-enhancing hydrolysate in food science.

Alterations of meat quality, lipid composition and flavor in breast meat of laying hens with fatty liver hemorrhagic syndrome

Fatty liver hemorrhagic syndrome (FLHS) has a high incidence rate in laying hens, and lots of FLHS-affected meat products enter the market every year. At the same time, the meat of laying hens is an important component of the human diet. However, the impact of FLHS on meat of laying hens is unknown, which could have a negative impact on consumers. To explore the effects of FLHS on chicken breast meat, a total of 36 twenty-five-wk-old Jingfen laying hens were used in the experiment. The hens were randomly divided into Control group and Model group, with 6 replicates per group and 3 hens per replicate. All chickens were raised in double-story step cages with individual pens. After a 3-wk acclimation period, the formal experiment began at 28 wk of age and lasted for 8 wk. Blood, liver, and breast meat samples were collected for the study of FLHS effects on breast meat. The impact of FLHS on meat quality was assessed by measuring indicators such as water-holding capacity and tenderness of the breast meat. Absolute quantitative lipidomics was employed to reveal the impact of FLHS on the lipid composition of chicken breast meat, and then validated by using RT-qPCR. Moreover, the volatilomics was utilized to detect changes in volatile organic compounds (VOCs) in chicken breast meat and to elucidate the resulting flavor changes. This research results showed that the meat quality of chicken breast meat decreased under FLHS, mainly manifested as reduced water holding capacity and decreased tenderness. The lipid content in the breast meat of FLHS-affected hens was significantly increased (P < 0.05). Among the affected lipids, 38 triglycerides exhibited notable elevation, possibly linked to heightened gene expression, such as lysophosphatidylcholine acyltransferase 3. The breast meat of laying hens with FLHS demonstrated an increased presence of VOCs, with 20 differential VOCs identified. Notably, 14 VOCs, particularly in 2-Undecenal, trans-Geranylacetone and ethyl nonanoate, exhibited substantial increases. These 3 VOCs had been identified as playing an important role in the formation of flavor in the breast meat of FLHS-affected laying hens. Correlation analysis suggested that the increase in these 3 VOCs might be related to the increase in lipid molecules such as phosphatidylethanolamine (38;3e) and acyl carnitine (10:3). In summary, FLHS reduced the breast meat quality of laying hens, altered its lipid profiles, and enhanced its flavor. These findings underscore the profound impact of FLHS on lipid and VOC profiles in chicken breast meat, offering valuable insights for chicken meat quality affected by FLHS.

Sensory And Physical Characteristics Of Burger Made From Different Percentages Of Spent Hens Meat

An experiment to study the Sensory and physical characteristics of burger made from different percentages of spent hens meat. The experiment included five treatments in which spent hens meat was introduced in different proportions to the beef burger mixture. The proportions of chicken and beef meat in the burger meat mixture were as T1 beef 100% + 0% spent hens meat . T2 beef 75% + 25 % spent hens meat. T3 beef 50 % + 50 % spent hens meat. T4 beef 25 %+ 75 % spent hens meat .T5 beef 0% + 100 % spent hens meat. the experiment was conducted in the poultry laboratory of the College of Agriculture - Wasit University . To conduct the research, beef and spent hens meat were purchased from local markets in the city of Kut after slaughter and cooling. The burger was cooked by hot air tablets at a temperature of 220 degrees Celsius for a period of 24 minutes. Sensory evaluation scores were determined for the characteristics of flavor, tenderness, juiciness, general acceptability, shape, appearance color, and structure, the sensory and physical properties of a burger made from different proportions of beef and spent hens meat. The results showed that adding spent hens meat can significantly improve the flavor, tenderness and juiciness of the burger. The sample containing an equal proportion of aged beef and chicken meat (50/50) was the most balanced in the properties studied and had the highest overall acceptance

Optimization of Level of Incorporation of Different Dietary Fiber in the Development of Spent Hen Meat Snack Sticks

The study was conducted from October to December, 2021 in the Department of Livestock Products Technology, College of Veterinary Science, Jabalpur, Madhya Pradesh, India to prepare spent hen meat snack sticks (SHSS) by partially replacing rice flour (RF) from the product formulation with healthy, dietary fiber rich oat, finger millet and amaranth flours (OF, FMF and AF) at different levels. Four batches of SHSS were prepared by substituting RF with different levels of OF, FMF and AF each at 0%, 5%, 10% and 15%. The optimum level of incorporation of dietary fiber from each set of products was standardized based on sensory evaluation of SHSS for various attributes. A combination of steaming, drying and frying (170°C for 45 sec) was found to be the most suitable cooking method for SHSS. Substitution of RF with 15% OF resulted in a significant decrease in flavour, crispness, and overall acceptability of the snacks while lower levels did not affect the sensorial attributes. FMF at 5% level did not alter the sensory attributes while at higher levels of replacement a significant decrease in color, flavor, crispness, and overall acceptability scores were noted. Higher levels of AF (15%) significantly improved flavour and overall acceptability of SHSS. The study clearly revealed that OF (10%), FMF (5%) and AF (15%) can be used efficiently for substitution of RF in the formulation of healthier and sensorially acceptable products. Snacks crafted with spent hen meat and dietary fiber will enhance the nutritional value especially with respect to amino acids, flavour, taste and technological functionality.

Effects of ultrasound-assisted marination on spent hen meats: Microstructure, textural and technological properties

The purpose of this study was to investigate the effects of ultrasound-assisted marination in distilled water, kiwi, and lemon juices on the water holding capacity, pH, color (L*, a*, b*), cooking loss, and textural and sensory qualities of spent hen breast meat. In addition, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) images of the meats were determined. When compared to the marination method used alone, the water-holding capacity and drip loss of the spent hen meat samples increased as a result of ultrasound-assisted marination (P < 0.05). When compared to the other samples, the group marinated in lemon juice with ultrasonic assistance had a lower cooking loss value (P < 0.01). The results showed that the samples marinated in lemon juice had the highest L* and b* values, however, the samples marinated in lemon juice with and without ultrasound assistance had the lowest a* values. In terms of textural characteristics, the sonication treatment further reduced the shear force, even if the marination with the lemon and kiwi juices only slightly reduced it as compared to the control. The samples marinated in lemon juice with sonication support exhibited the lowest hardness value. According to DSC, the ultrasound-assisted marination process decreased the thermal denaturation temperatures of meat proteins. In terms of the SEM analysis results, it was observed that the inter-myofibrillar spaces were more evident in the chicken breast meats that underwent ultrasound-assisted marination compared to the only marination groups.

Evaluation of storage stability of dietary fibre incorporated aerobically packaged spent hen meat snacks at ambient temperature

PurposeThe purpose of the study was to produce a healthier, convenient and traditional ready-to-eat (RTE) snack option with increased nutritional value, using spent hen meat, dietary fibre (DF) and simple technological methods. The product was designed to be stable without refrigeration and be easily adoptable by local self-help groups, rural women and youth and entrepreneurs in urban and semi-urban areas.Design/methodology/approachConventional binder used for making snacks, i.e. rice flour was partially replaced by different sources of antioxidant DFs, i.e. oat flour (T1 – 10%), finger millet flour (T2 – 5%) and amaranth flour (T3 –15%) to prepare spent hen snack sticks (SHSS). The snacks were then packaged in low density polyethylene (LDPE) pouches and evaluated for their storage stability at ambient temperature for a period of 35 days. Their physico-chemical, sensory and microbiological quality was evaluated at a regular interval of 7 days. The proximate composition of developed SHSS was compared to commercially available snack products (chakli/murukku – snacks without meat).FindingsThe fibre-enriched SHSS showed significant improvement in nutritive value, as they contained more fibre (p = 0.001) and protein (p = 0.029) than control SHSS. When compared to commercially available snack product SHSS showed three-fold significant increase in protein (p = 0.000) and ash content (p = 0.001) and only 11%–12% total fat as compared to 31% fat in the market-available product. The most acceptable treatment in terms of overall sensory quality and nutritional aspects was T3; however, T2 was more shelf-stable during the storage period. The study showed that fibre-enriched snacks can be stored at ambient temperature for up to 35 days without substantial loss in physico-chemical, sensory and microbial quality. Hence, substituting rice flour with DFs can lead to the development of products with better sensory attributes and improved functionality.Social implicationsThe simplicity of the product in terms of composition, machinery and low production costs makes it an easily adoptable one by small-scale entrepreneurs, especially those belonging to semi-urban areas.Originality/valueIncorporation of spent hen meat, a relatively cheap but abundant source of protein, in RTE products can serve as an effective way to alleviate protein malnutrition, whereas addition of fibre further improves the functionality of the product. The methodology can be easily taken up by small-scale entrepreneurs and create a market for snack-based functional meat products.

Investigation of the peptides with calcium chelating capacity in hydrolysate derived from spent hen meat.

Calcium peptide chelates are developed as efficient supplements for preventing calcium deficiency. Spent hen meat (SHM) contains a high percentage of proteins but is generally wasted due to the disadvantages such as hard texture. We chose the underutilized SHM to produce peptides to bind calcium by proteolysis and aimed to investigate chelation between calcium and peptides in hydrolysate for a sustainable purpose. The optimized proteolysis conditions calculated from the result of response surface methodology for two-step hydrolysis were 0.30% (wenzyme/wmeat) for papain with a hydrolysis time of 3.5h and 0.18% (wenzyme/wmeat) for flavourzyme with a hydrolysis time of 2.8h. The enzymatic hydrolysate (EH) showed a binding capacity of 63.8±1.8mg calcium/g protein. Ethanol separation for EH improved the capacity up to a higher value of 68.6±0.6mg calcium/g protein with a high association constant of 420M-1 (25°C) indicating high stability. The separated fraction with a higher amount of Glu, Asp, Lys, and Arg had higher calcium-binding capacity, which was related to the number of ─COOH and ─NH2 groups in peptide side chains according to the result from amino acid analysis and Fourier transform infrared spectroscopy. Two-step enzymatic hydrolysis and ethanol separation were an efficient combination to produce peptide mixtures derived from SHM with high calcium-binding capacity. The high percentage of hydrophilic amino acids in the separated fraction was concluded to increase calcium-binding capacity. This work provides foundations for increasing spent hen utilization and developing calcium peptide chelates based on underutilized meat.

The Effect of Catfish Meat Substitution on the Physical and Organoleptick Quality Of Meatbals with Rejected laying HenMeat

The Effect of Catfish Meat Substitution on the Physical and Organoleptick Quality Of Meatbals with Rejected laying HenMeat

ОЦЕНКА БЕЗОПАСНОСТИ КОММЕРЧЕСКИХ ПОЛУФАБРИКАТОВ ИЗ МЯСА КУР ПРИ НАРУШЕНИИ РЕЖИМА ИХ ХРАНЕНИЯ

The situation has been modelling in the article of possible violations of temperature storage regimes minced hen meat and chunks from this meat. These products inconsistency has been found in sanitary and hygienic standards of microbiologic traits in these conditions.

The Effect of Temperature and Storage Duration on the Quality and Attributes of the Breast Meat of Hens after Their Laying Periods.

The purpose of this study was to evaluate the effect of temperature (2 °C and 6 °C) and storage duration on the quality and attributes of hens' breast meat after their laying periods. The study included physicochemical characteristics (pH, drip loss, colour, shear force), microbiological quality (total Enterobacteriaceae family and Pseudomonas count), and sensory quality. Bacterial identification was performed using matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry. The increased meat pH and drip loss was greater at 6 than 2 °C (p < 0.05). An increase in the tenderness of the meat stored at 6 °C was found as early as day 4, as well as at 2 °C on day 8 of storage (p < 0.05). On day 4 of storage, the meat was characterised by a darker colour than on the first day, but the darkening was greater at 6 °C than at 2 °C (p < 0.05). At 6 °C, on day 4 of storage, there was an increase in yellow saturation (b*) of the meat, which was higher at 6 °C than at 2 °C (p < 0.05). At 2 °C, the total bacterial count and number of Pseudomonas spp. in the meat gradually increased along with increasing storage duration, reaching 4.64 log cfu/g and 4.48 log cfu/g, respectively, on the 8th day of storage. At 6 °C, on the sixth day of storage, the total bacterial count in the meat exceeded 7 log cfu/g, considered the limit of microbiological safety. The meat stored at 2 °C had an acceptable sensory quality until the 8th day of storage. The study shows that storage at 2 °C preserves the sensory characteristics and microbiological safety of the hen meat longer at an acceptable level after the laying period. Extended storage life may be of importance to consumers and the meat industry.

The interaction of chia mucilage-based edible film and transglutaminase enzyme on spent hen meat nuggets

ABSTRACT 1. The aim of this study was to utilise low-value spent hen meat and investigate the possibility of using chia (Salvia hispanica L.) as a mucilage-based edible film to prevent loss of quality in meat products. For this purpose, spent hen meat was reconstructed with the addition of transglutaminase (TGase) at different concentrations (0.5, 1 and 1.5%) and used to produce nuggets. These were covered with chia mucilage-based film and kept at 4°C for 7 d. 2. The addition of transglutaminase and coating with film decreased meat pH (P < 0.01). Samples containing transglutaminase had higher thiobarbituric acid (TBA) value (P < 0.01), while the DPPH value of the samples was not affected by the transglutaminase and edible film (P > 0.05). Hence, mucilage-based edible film did not prevent or delay the oxidation of nuggets. 3. Transglutaminase improved the texture characteristics of the nuggets and the edible film reduced fat retention in the samples. The combined use of transglutaminase and film decreased cooking loss and increased water holding capacity (P < 0.01). In the sensory analysis, nuggets with transglutaminase and film had more overall acceptability scores, although the results were not statistically significant.

Prevalence of food additive in hen meat products

The present investigation aimed to assess chemical monosodium glutamate as flavoring agent in processed hen meat products. One hundred random of processed hen meat samples were estimated. The highest concentration mean± SE chemical Food additive Monosodium glutamate (mg/g.) as an flavoring agent was found in samples of canned hen (3.950 ± 0.51) than in hen pannae samples (1.850 ± 0.28), hen minced meat samples were the highest concentration (2.750 ± 1.05), followed by hen shawerma samples (1.730 ± 0.220), and fried hen meat samples (1.470 ± 0.850) mg/g. of chemical Food additive Monosodium glutamate as flavoring agent. So, the current estimated chemical Food additive Monosodium glutamate as flavoring agent contents in the examined processed hen samples were less than the acceptable levels stated by Egyptian Standards, FDA stated that contamination of the examined chicken meat samples in this study revealed that the amount of chemical monosodium glutamate as flavoring agent causing reactions in human being ranged from 0.500 to 3.00 mg. so a typical serving of a foodstuff with added chemical Monosodium glutamate as flavoring agent has less than 0.50 g. of Monosodium glutamate as flavoring agent. Reduction the public health hazards of exposure to these food additives as flavoring agent. The corrected and safe doses of chemical Food additive Monosodium glutamate as flavoring agent in food of human.

Prevalence and Characteristics of Campylobacter and Salmonella in Meat Derived from Spent Hens

Meat derived from spent hens as well as broilers is destined for human consumption. There are many reports on the prevalence and antimicrobial resistance of Campylobacter and Salmonella in broiler meat, but few in spent hen meat. Therefore, we investigated the prevalence and antimicrobial resistance of these genera in spent hen meat collected at chicken processing plants. Campylobacter and Salmonella were isolated from 47 (92.2%) and 18 (35.5%), respectively, of breast meat derived from 51 spent hen flocks. Campylobacter jejuni accounted for 87.5% of Campylobacter isolates. The highest resistant rate in C. jejuni isolates was found for ampicillin (45.3%), followed by tetracycline (14.3%) and ciprofloxacin (14.3%). There was no Campylobacter isolate resistant to erythromycin, which is recommended as a first-choice antimicrobial for humans when Campylobacter enteritis is strongly suspected. Of Salmonella isolates, the first and second most frequent serovars were Salmonella Corvallis (30.4%) and S. Braenderup (21.7%), respectively. Of Salmonella isolates, 30.4% were resistant to streptomycin. There was no Salmonella isolate resistant to ciprofloxacin, which is one of the recommended antimicrobials for humans against Salmonella enteritis. This study shows that one third of spent hen meat is contaminated with Campylobacter or Salmonella, and administration of erythromycin or cefotaxime is an effective option for patients with Campylobacter- or Salmonella- enteritis, respectively, caused by consumption of spent hen meat.

Effect of Tenderization with Citric Acid on some Physical Traits of Spent Hen Meat

In this study, spent hen meat, at the market was used after slaughter and cleaning, which were tenderized with citric acid. The treatments were as follows: T1 negative control treatment (soaking with distilled water only) for 12 hours. T2: Positive control treatment (tenderizing with vinegar at a rate of 100 ml/L distilled water) for 12 hours. As for T3, T4 and T5 they are tenderized with citric acid at a concentration of 100, 200 and 300 ml of citric acid solution per liter of distilled water for 12 hours, respectively. The results indicate that all tenderizing treatments with citric acid led to a significant increase in water carrying capacity, with a significant decrease in the loss in the exudate compared to the negative control treatment, with a significant decrease in the weight loss during cooking at the high level of the treatment.

Intake of toxic metals through dietary eggs consumption and its potential health risk assessment on the peoples of the capital city Dhaka, Bangladesh

Around the world, hen meat and eggs are very widely consumed in dishes like curries, processed cuisine, and fast food. The ingestion of contaminated eggs poses a biochemical risk from the perspective of food safety due to the presence of heavy metal and trace element residues in hen eggs. The purpose of this study was to examine the concentrations of heavy metals in eggs from commercial chicken farms from capital city and hens from local area in order to identify the most significant heavy metal concentration in hen eggs. The concentrations of Cd, Cr, Cu, Pb, Mn, Ni, Fe, Zn, Co and As in samples of hen eggs collected from different locations were measured in the present study and concentrations of these selective metals were found to be between < 0.001, 0.01–0.89, 0.81–0.015, 0.81–58.8, 0.32–1.9, 0.05–1.03, 0.04–0.38, 10.6–104.02, 2.41–48.46, 0.04–0.5 mg/kg-fw and BDL respectively. The findings showed that Cu, Pb, Fe and Zn had levels over the dietary food's maximum permissible limit (MPL). Multivariate statistical studies showed that human activity was the main contributor to the presence of heavy metals in the sampled diets. Estimated daily intake (EDI), target hazard quotient (THQ) of individual heavy metals, and carcinogenic risk (CR) for lifetime exposure were used to evaluate the risks to human health associated with dietary intake of these metals through consumption of hen eggs. Provisional tolerable daily intake values (PTDI) for Pb, Cu, Zn, and Fe were higher, indicating that these metals might be harmful to human health if consumed in eggs by both children and adults. The evaluated foodstuffs can be consumed with low or less risk of exposure to heavy metals because the computed values of THQ and CR were below their respective allowed thresholds.

Pengaruh penambahan konsentrasi cuka apel berbeda terhadap karakteristik kimia dan organoleptik kaldu ayam petelur afkir

Laying hen meat is a food ingredient that contains high enough nutrition. The weakness of rejected laying hens is that the meat is very tough, so it is not accepted by most consumers. One way to make chicken meat attractive is to use it as processed broth. Chicken meat and bones contain high levels of minerals and fat, so you need to add apple cider vinegar to remove these substances. This study aims to determine the chemical quality (fat content, ash content, and pH) and organoleptic quality (color, taste, and aroma). This study used 4 treatments, namely P0 (0%), P1 (1%), P2 (2%), and P3 (3%) each repeated 4 times to obtain a total of 16 research samples. The designs used were Completely Randomized Design (CRD) and Randomized Block Design (RAK). The results showed that the average value of chemical quality parameters (fat content, ash content, and pH) along with the addition of the highest concentration of apple cider vinegar was produced by P3 of 3.25%, 0.37%, 5.89. The average organoleptic values ​​(color, taste, and aroma) along with the addition of the highest concentration of apple cider vinegar were produced by P3 of 4.48 in the category of creamy brown color, 4.36 in the category of meaty aroma, and 4.20 in the category of savory taste. It could be concluded that the addition of apple cider vinegar to the culled laying hen broth had a significant effect (P&lt;0.05) on the chemical and organoleptic quality of the culled laying hen broth.

Veganism and Oral Health—An Overview through the Perspective

AbstractWhen meat and dairy products are no longer consumed, the practice of veganism, which forgoes the use of animal products, substantially impacts diet. The prevention and treatment of diseases like rheumatoid arthritis, diabetes, neurodegeneration, hypertension, and vascular diseases are usually aided by vegan diets. Vegan diets are associated with improved cardiovascular health and better nutrition quality than omnivorous diets. Vegans and vegetarians have a lower risk of periodontal disease but may be more prone to tooth erosion and dental caries due to deficiencies in vitamin B12 and lower saliva pH. A vegetarian or vegan diet may increase the risk of developing tooth erosion, but an omnivorous diet may increase the risk of periodontal disease and dental caries. Further clinical research must be performed to produce more statistically significant results and to support future studies that contrast omnivore, vegetarian, and vegan diets and their effects on dental health status.

Effect of Using Slaughtering Animal Fats in Meatballs Produced From Layer Hen Meat on Product Quality

Çalışmada yumurta verimi azaldığı için yaklaşık 2 yaşında kesime gönderilen yumurtacı tavuk etlerinden köfte üretilmiş ve üretimde koyun kuyruk yağı ve gömlek yağlarının farklı oranlarda (%0, 10 ve 20) kullanım olanakları araştırılmıştır. Üretilen köfteler pişirildikten sonra vakumla paketlenerek 4±2°C’de 21 gün süresince depolanmış ve depolama boyunca belirli sürelerde (0., 7., 14. ve 21. gün) fiziksel, kimyasal, duyusal ve mikrobiyolojik özellikler açısından incelenmiştir. Köfte örneklerinin depolama süresi boyunca ölçülen ortalama fizikokimyasal değerleri; pişirme kaybı %36.53, pH değeri 6.21, nem içeriği %57.32, protein içeriği %22.68, kül içeriği %2.57, tuz içeriği %1.76 ve TBARS değeri 0.279 mg MA/kg olarak bulunmuştur. Ortalama duyusal genel beğeni puanı ise 5 üzerinden 3.17 olarak tespit edilmiştir. Yağ içeriği en yüksek köfte gruplarının %22.57 ile %20 kuyruk ve %22.58 ile %20 gömlek yağlı gruplar olduğu belirlenmiştir. Köfte örneklerinde toplam aerobik mezofilik bakteri (TAMB) sayısı ortalama olarak 6.17 log kob/g tespit edilmiş olup ürün gruplarının hiçbirinde Salmonella spp. ve Clostridium perfringens varlığı gözlenmemiştir. Yumurtacı tavuk etlerinden üretilen köftelerde farklı koyun yağları hayvan yağı kullanımının, ürünlerin fiziksel, kimyasal ve duyusal özellikleri üzerinde olumlu yönde etkileri olduğu tespit edilmiştir.

A comprehensive study on effect of electrical stimulation on biophysical and biochemical parameters of spent hen meat using discriminant function analysis

The objective of this study was to assess the effect of electrical stimulation (ES) on breast and thigh muscles in spent hen. A total of 24 spent hens (White Leghorn) were slaughtered and split into two halves, each half was either treated with postmortem ES (150V) or was used as a non-stimulated (NS) control. Breast and thigh muscles were excised and analysed for biophysical, colour and sensory qualities after ageing for 24 h at 4 ± 1 ˚C. Biochemical parameters were recorded immediately (0h) and after 24h of ES. Biophysical parameters like water holding capacity (WHC), protein extractability, shear force value (SFV) and myofibre fragmentation index (MFI) of both types of muscles varied significantly with ES. Electrical stimulation significantly reduced the pH and glycogen content in both muscles and the thigh muscle showed a significantly higher pH and lower glycogen content than the breast muscle. No significance difference in metabolic rate (R-value) was observed between ES and NS thigh at 24 h. ES had no significant effect on colour and ES significantly improved the sensory value of both breast and thigh muscle. Canonical discriminant and Mahalanobis distance (D2) analysis of biophysical and biochemical parameters demonstrated that the effect of electrical stimulation was comparatively more in thigh muscle than breast with an ageing period of 24 h.