Doe Rabbits Research Articles

Bioactive compounds enrichment in rabbit doe’s diet pre-and during pregnancy improves productive and reproductive performance and cost-effectiveness under hot climates

This study aimed to investigate the effect of diet supplementation with a symbiotic (SY), bee pollen (BP), honey bee (HB), date palm pollen (DPP) and their mixture (MIX) on female rabbit productive and reproductive performances under desert hot climates. Seventy-two Californian does of 5 months age and average body weight of 3250 ± 78.2 g were randomly allotted into six groups, each of 12 does. All does orally receive 3 ml distilled water for 10 days before mating and 28 days during pregnancy. Treatments were repeated for four consecutive parities. The first group served as control (C) given distilled water only, however the second, third, fourth and fifth groups were supplemented with 3 ml distilled water containing 0.2 ml SY, 200 mg DPP, 200 mg BP, 0.2 ml HB/doe per day, respectively. While, the sixth group does were given all previous ingredients (MIX). Sexual receptivity rate, fertility rate, kindling rate, and newborn traits were recorded. Also, maternal feed intake, feed conversion ratio, and digestibility coefficients of nutrients were recorded. Does in all groups were artificially inseminated with 0.5 ml of fresh heterospermic semen of 15 fertile bucks extended in Tris at 806–1006 sperm/ml. Treatment increased maternal body weight and daily gain with highest values (P < 0.05) in BP, SY, and MIX does. All treatments enhanced feed intake and feed conversion ratio (FCR) compared with control. Number services per conception decreased (P < 0.01), while litter size and weight and survival at birth and weaning increased (P < 0.01) in treated than control does. Treated does produced more milk than control. Digestibility coefficients of all nutrients were improved (P < 0.01) in treated does. In conclusion, supporting rabbit does pre- and during pregnancy with diets supplemented with a mixture of honey bee, date palm pollen, bee pollen, and synbiotic improves the productive and reproductive performances of rabbit does and their offspring.

Potency evaluation of different GNRH analogues on ovulation induction and reproductive performance of doe rabbit.

Gonadotropin-releasing hormone (GnRH) -supplemented extenders have emerged as a welfare-orientated method to induce ovulation in the artificial insemination (AI) of rabbits. The main factor that limits the bioavailability of GnRH analogue on intravaginal administration is the proteolytic activity of enzymes present in rabbit seminal plasma. The use of GnRH analogues with higher biological potency would allow us to decrease their concentration in the seminal dose without compromising effectiveness. The current study was designed to assess the efficacy of various GnRH analogues concerning their ability to induce ovulation in rabbit AI. The base solution used for experimental extenders contained an aminopeptidase inhibitor. Four experimental groups were used, females from the Control group were induced to ovulate with an intramuscular administration of 1 μg of buserelin, while in the other three groups females received an intravaginal administration of 3.5 μg of buserelin (BUS), deslorelin (DES) or fertirelin (FER) within the seminal dose. Results showed that the ovulation frequency was similar in all groups studied. A concentration of 3.5 μg of the different GnRH analogues tested in this study showed similar potency in inducing ovulation in non-lactating females, yielding comparable results in terms of pregnancy rate at birth and prolificacy.

Influence of nano-formulations of clove bud (Syzygium aromaticum) extract on freezing ability, antioxidant capacity, caspase-3 activity, acrosome reaction and fertility of frozen rabbit semen.

The current study aimed to investigate the impact of nano-formulations of clove bud ethanolic extract (CBENF) in the extender on sperm characteristics, antioxidant capacity, oxidative biomarkers, enzymatic activity, apoptosis and fertility of post-thawed rabbit semen. Twelve mature male rabbits semen samples were pooled and cryopreserved in a Tris-egg yolk-based extender containing varying concentrations of CBENF (0, 25, 50, 75 and 100 μg/mL). After the equilibration and freezing-thawing process, CBENF (100 μg /mL) significantly enhanced progressive motility, viability and membrane integrity. Conversely, sperm abnormality was significantly reduced by CBENF supplementation. Total antioxidant capacity was increased in the post-thawed sperm medium, while nitric oxide and malondialdehyde were decreased in all CBENF concentrations. The lactic dehydrogenase and caspase-3 activities were decreased, whereas the number of live spermatozoa with an intact acrosome was increased in all CBENF concentrations. Conception rate and litter size per doe were higher in doe rabbits inseminated with semen supplemented with 100 μg CBENF/mL than un-supplemented group (76% vs. 52% and 8.4 vs. 7.7/doe), with no statistical differences. These findings suggest that supplementing rabbit extenders with 100 μg of CBENF/mL could be an effective strategy for enhancing freeze-thawing rabbit sperm attributes and fertility.

Analysis of Russian and foreign research on rabbits feeding (review)

Rabbit farming being a well-developed and highly profi table area of livestock farming is one of the indicators of the state of economic development of the country. In Russia despite the fact that 78,5 % of rabbit meat is produced on household farms industrial rabbit breeding is gaining momentum. The basis of any area of animal husbandry is the organization of feeding, since feeding costs account for 60–70 % of the cost of production, and more than 90 % of animal diseases are associated with errors in their feeding. At the end of 2020 rabbit meat production in Russia amounted to 19,6 thousand tons. Total for the period 2016–2020 rabbit meat production increased by 8 %. Scientists from different countries pay special attention to studying the nutritional and energy needs of replacement young animals, pregnant and lactating doe rabbits, since the reproduction process and the volume of production depend on them. The results of scientifi c research on feeding doe rabbits during the reproductive period with complete granulated feed with diff erent ratios of nutrients and energy have been analyzed in the review. The authors note that the content of digestible energy and protein in the diets used to feed pregnant doe rabbits in Russian and foreign studies are the same, while the fiber content differs significantly. Since researchers around the world are concerned about the same problems of optimizing the feeding of doe rabbits, a joint discussion of research results especially by scientists belonging to different scientific schools opens up new horizons for achieving purposes and practical use of the new knowledge obtained.

REPRODUCTIVE CAPACITY OF FEMALES AND GROWTH OF YOUNG RABBITS USING DIOECIOUSLY NETTLE FLOUR IN FEEDING

Introduction. Breeding of rabbits is the one of the promising branches that occupies a special position in modern animal husbandry. Rabbits are characterized by high fertility and early maturity. A short pregnancy period and the ability of rabbits to combine the physiological periods of lactation and gestation make it possible to obtain more than 30 rabbits and 70 kg of meat per year from a female rabbit.&#x0D; At the same time, one of the key factors that prevents the comprehensive realization of the genetic potential of female productivity is the deterioration of their reproductive capacity. In this sense, the use of phytobiotics in feeding is considered a promising way to solve the problem in order to prevent unproductive losses of the brood stock during pregnancy and birth. Taking this into account, the purpose of the conducted research was to determine the expediency and effectiveness of using dioecious nettle flour in the alimentation of rabbits in the direction of improving parameters of female reproductive capacity, preservation and growth of young before weaning.&#x0D; The realization of the set goal involved the use of a complex of generally accepted zootechnical and statistical research methods. Three groups of female rabbits in the gestation, each with three heads were formed during the process of justifying the set goal. The difference in feeding was in the method of nutritional intervention of the phytosupplement made from nettle: I group – restriction of phytosupplement consumption, II and III groups – consumption of phytosupplement. In the course of exploratory studies, the optimal dosage of nettle flour for their compound feed was substantiated in the amount of 10% versus 3.5 and 15%. From the offspring obtained from the offspring itself, three groups of young animals with 4 heads in the skin were formed: I – consumption of phytosupplements from the 21st day after birth, II group – consumption of phytosupplements through the placental route via the mother's body. , III – consumption of phytonutrients placental in the mother’s womb and orally from the 21st day after birth.&#x0D; Research results. It was established that the fertility itself ranged from 5 to 8 rabbits in the nest, while a total of 56 viable rabbits were obtained in the offspring. However, a higher average yield of rabbits, including live ones, per female that gave birth of a doe rabbit was noted in group III. According to this indicator, they exceeded their peers in the II and I groups by 16.7% and 23.5%, respectively, whose productivity was almost the same, ranging from 5.67 to 6.00 offspring. Despite this, no probable difference between them was found during the biometric processing of the obtained results. The number of stillborn rabbits of the II group was 2 heads or 11.1%, I – 3 heads or 17.6% of the natural offspring, while the III group of animals was characterized by increased survival of the obtained offspring, in which such individuals were not registered. The weight of the nest at birth in female rabbits of the III group was also greater by 59.0 g or 15.1% compared to the female rabbits of the II group and by 68.4 g or 18.0% compared to the individuals of the I group, while the average live weight of one individual from the offspring within the experimental groups varied from 63.9 g to 66.9 g. On the other hand, the difference between the groups in favor of the females of the III group in terms of the nest weight at the age of 30 days decreased slightly and amounted to 754.7 g or 30.7% in relation to the II group and I group – 806.2 g or 33.5%. The investigated indicators in the females of the II group were close to those of the females of the I group.&#x0D; Conclusions. The live weight of the young of the III group during the first month of postnatal development was significantly higher than the peers of the other groups by 34.5 and 49.2 g, or 8.1% (p &lt; 0.01) and 12.0% (p &lt; 0.001) at one hundred percent level of preservation in all groups. In accordance with the changes in the youngsters live weight from all groups, the intensity of their growth also changed. In general, during the period from birth to 30 days of age, the average daily weight gain of rabbits from the III group increased by 9.2% (p &lt; 0.01) compared to peers of the I group and by 14.5% (p &lt; 0.001), compared to the youngster of the II group. The specified advantages in terms of growth energy were also observed between II and I groups, in favor of the latter, but they were less pronounced and amounted to 4.9%, respectively, without a statistically significant difference between them.

In Vitro Embryo Production of Doe Rabbits Administrated with Aqueous Garlic Extract

In Vitro Embryo Production of Doe Rabbits Administrated with Aqueous Garlic Extract

Antioxidant activity of raw and cooked onions in rabbit doe nutrition

The aim of this research is to examine how raw and cooked onions affect some antioxidant enzymes and some tissues in female rabbits. Twenty-four female albino rabbits weighing (1-1.5 Kg), (5-6 months age), non-pregnant, were used for the experiment, and they were divided into three groups for a duration of 28 days. A 20 g/kg raw onion and same amount of cooked onion were added to the second and third groups’ diets respectively for comparison of results with control groups without any addition of onion. Results showed that diets supplemented with raw and cooked onion significantly increased the superoxide dismutase (SOD) activity. The cooked onion group showed normal and no pathological changes in liver, kidney, and heart tissues, while liver tissues of both control and raw onion groups suffered extreme congestion in the central veins of the liver lobules and in kidney tissues of only control rabbits, developed hemorrhagic foci was observed. In the control and raw onion groups, the heart tissue showed the development of hemorrhagic foci and necrosis in the heart muscle fibers. In conclusion, both raw and cooked onions boosted the activity of SOD enzyme, but the cooked onions showed to be more effective than raw at protecting liver, kidney, and heart tissues against cell necrosis caused by oxidative processes.

Impacts of selenium nanoparticles and spirulina alga to alleviate the deleterious effects of heat stress on reproductive efficiency, oxidative capacity and immunity of doe rabbits

Effects of dietary inclusion of spirulina platensis (SP) and selenium nanoparticles (SeNPs) combination (SP-SeNPs) on the reproductive performance in vivo and in vitro, reproductive and metabolic hormones, hemato-bichemical parameters, oxidative stress, and immunity of heat-stressed doe rabbis were evaluated. All supplements significantly increased live litter size at birth and weaning, viability rate at birth, hemoglobin and red blood cells, and plasma T3, T4, insulin, total proteins and albumin compared with control. Plasma estradiol 17-β (pre-mating), progesterone (mid-pregnancy), and prolactin (day −7 postpartum) were significantly increased only by SeNPs (0.3, 0.4, and 0.5 mg/kg). All dietary supplements significantly reduced WBCs, cortisol, lipid profile, and improved liver and kidney functions. Immunoglobulins levels, antioxidants capacity were significantly increased, superoxide dismutase was increased by SeNPs (0.4 and 0.5 mg/kg), while malondialdehyde was reduced by 0.3, 0.4 and 0.5 SeNPs mg/kg. Sexual receptivity, pregnancy rate, viability rate at weaning, ovulation rate, and embryo quality were significantly increased by increasing SeNPs above 0.1 mg, while embryo yield was increased by >0.2 mg SeNPs/kg. A combination of SP and SeNPs, could be potentially used as a strong antioxidant to enhance heat regulation and doe rabbit reproduction via improving reproductive and metabolic hormones, antioxidant status and immunological parameters.

Immunomodulatory, Anti-Inflammatory and Antioxidant Activities of Bee Venom in Doe Rabbits Under High Ambient Temperature

Immunomodulatory, Anti-Inflammatory and Antioxidant Activities of Bee Venom in Doe Rabbits Under High Ambient Temperature

Morphometric characterization of New Zealand white rabbit raised at different areas

The study aimed to morphometric characterization the New Zealand White (NZW) doe at three different areas. The materials used were 295 heads of NZW doe rabbits from 29 farms located at different areas. Twelve morphometric characteristics consist of body weight, eight body measurements, and three-body indices. Data analysis was performed by Mixed model, Pearson’s correlation, Principal component, and Canonical discriminant procedures. The most of parameters showed significant differences among areas. The heaviest body weight (4.71 kg) was observed in low-land and the lightest in medium land (3.54 kg). Most of the morphometric characters showed positive correlations with each other. Results of principal component show that the body indices of NZW doe raised in three different areas were similar. Canonical discriminant analysis showed that low-land was more favorable than high-land and medium land. In conclusion, The variation in size difference for morphometric characters of female New Zealand white rabbit could be explained by body index and thoracic index. The morphometric characteristics of New Zealand white doe raised in low-land area were superior to those raised in high-land and medium land areas.

The Relationship between fertility characteristics with some Biochemical parameters of blood in New Zealand White Rabbits

Two trails were carried out to study the relationship between sexual characteristics of buck and doe with some blood parameters in New Zealand white rabbits . Atotal of 10 male rabbits ( 6-7- months old) and 8 primiparous doe rabbits (6 months of age)have been used in the first and second traits, respectively .The results of the first trail showed that buck trails were within the normal range .The correlation coefficient values, were positive (P &gt; 0.01) between ejaculate volume and total protein , albumin and between blood electrolytes (Ca , Na and K) and each of sperm motility and sperm concentration were negative(P &gt; 0.01 or 0.05 ) between Ca , Na and K and each of dead and abnormal spermatozoa . Inorganic phosphorus was positively correlated. (P &gt; 0.05) with sperm concentration. The correlation coefficient values between globulin, urea-N or creatinine and each of libido, semen physical characteristics and fertility ability, were not significant . In the second trial , the mean values of doe trails were found within the normal range . the correlation coefficients were significantly ( P &gt; 0.01)positive between total protein and conception rate and between creatinine and each of litter weight at day 21,litter gin weight at weaning also between Ca and each of gestation length , gain weight at weaning , Na and litter size at day 21 and between K and gestation length .Correlation coefficient values between globulin, urea-N or P and each of doe traits , were not significant . Generally, the overall means of blood constituents were nearly or within the normal level of Rabbits

Nicole Legnani. The Business of Conquest. Empire, Love and Law in the Atlantic World

Nicole Legnani. <i>The Business of Conquest. Empire, Love and Law in the Atlantic World</i>

Effect of Moringa oleifera Leave Meal on Digestibility and Haematological Parameters, and Health Status of Doe Rabbits

The study involved the use of the Moringa oleifera leaf meal (MOLM) to feed doe rabbits and determine its effect on their nutrient digestibility and haematological indices. Five (5) treatment diets were formulated to contain MOLM inclusion levels of 0% (control), 25%, 50%, 75% and 100%. Forty five (45) rabbits of same sex were distributed randomly into five groups of nine animals and replicated three times per treatment having between 24 – 28 weeks of age with initial weight of about 1800 – 2400 g per animal. The does were provided with feed and water throughout the experimental period which lasted eight weeks. Analysis of the Moringa leaf meal (MOLM) on DM basis indicated that the leaves contained 92.15% Dry Matter, 12.85% Crude Protein, 5.10% Ether Extract, 6.57% Crude Fibre, 11.20% Ash, 64.28% Nitrogen Free Extract. The apparent digestibility of CP, CF, EE and NFE were affected (P&lt;0.05) by the graded levels of MOLM inclusion except for the dry matter. The haematological parameters like packed cell volume, white blood cell, lymphocyte, neutrophil and monocyte vary significantly (p&lt;0.05) between treatments. MOLM could be included in rabbit feed at an inclusion level of 25% without any adverse effect on the digestibility performance while blood indices of doe rabbits improved with increasing levels of Moringa oleifera.

V12-01 NEW BIPOLAR RADIOFREQUENCY SEALING TOOL FOR TRANSDERMAL VASECTOMY IN THE RABBIT MODEL: A PARADIGM SHIFT IN VASECTOMY TECHNIQUE?

You have accessJournal of UrologyCME1 May 2022V12-01 NEW BIPOLAR RADIOFREQUENCY SEALING TOOL FOR TRANSDERMAL VASECTOMY IN THE RABBIT MODEL: A PARADIGM SHIFT IN VASECTOMY TECHNIQUE? Gerard Henry, Ryan Griggs, Michel Labrecque, Joel Marmar, and Tariq Hakky Gerard HenryGerard Henry More articles by this author , Ryan GriggsRyan Griggs More articles by this author , Michel LabrecqueMichel Labrecque More articles by this author , Joel MarmarJoel Marmar More articles by this author , and Tariq HakkyTariq Hakky More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000002638.01AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: Bipolar Radiofrequency (RF) sealing tools have been shown to be successful in the treatment of many areas in the human body. RF has been utilized in the sealing of larger blood vessels and in nerve pain ablation in humans, showing good results for years. Urology has used RF ablation percutaneously for treating renal tumors for years. We evaluate the utilization of a new bipolar RF sealing tool for transdermal vasectomy in the rabbit model following AUA guidelines. METHODS: Two groups of 5 male New Zealand white rabbits were given IV sedation and local anesthetic and subsequent transdermal bilateral partial vasectomy using a high lateral scrotal approach. We isolated the vas with a novel insulated clamp fitting the U-shaped electrode of the sealing tool (Figure 1). In Group 1 (n=5), the device was set at 60W for 20s; however, this may differ across species. In the second group (n=5) the size of the U-shaped tool jaw was reduced and the device was set at 40 and 60W using thermal sensors. Impedance alarms shut off energy at a predetermined level. Wound healing, complications, survival, postmortem biopsies, and histology were evaluated. A doe rabbit was used with semen collections & semen analyses preformed on all male rabbits. RESULTS: We sacrificed 4 of the 5 (80%) of Group 1 rabbits due to poor wound healing secondary to excessive thermal damage. All 5/5 (100%) of Group 2 rabbits had good tissue healing and survived the procedure. The impedance alarm went off at about 5 seconds of sealing time and the device energy shut off in all Group 2 procedures. All rabbits had a negative semen analysis and on histology had occluded vas deferens. In bench top testing, we found that a 5 second interval is optimal for vas ligation. (Figure 1)Bench top testing revealed that thin short jaws (50 degree Celsius) created lower nearby tissue temperature than wide long jaws (77 degree Celsius). CONCLUSIONS: Transdermal bipolar RF sealing successfully occludes the vas deferens in rabbit vasectomy. The jaw size and sealing time using an impedance alarm system appear to be important for wound healing. This novel technique may decrease vasectomy time and morbidity. Canine studies are underway and analysis is pending. Further studies and FDA approval are needed before its application in humans. Source of Funding: Signati © 2022 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 207Issue Supplement 5May 2022Page: e967 Advertisement Copyright & Permissions© 2022 by American Urological Association Education and Research, Inc.MetricsAuthor Information Gerard Henry More articles by this author Ryan Griggs More articles by this author Michel Labrecque More articles by this author Joel Marmar More articles by this author Tariq Hakky More articles by this author Expand All Advertisement PDF DownloadLoading ...

New Bipolar Radiofrequency Sealing tool for Transdermal Vasectomy in the Rabbit Model: a Paradigm Shift in Vasectomy Technique?

ABSTRACT Introduction Bipolar Radiofrequency (RF) sealing tools have been shown to be successful in the treatment of many areas in the human body. RF has been utilized in the sealing of larger blood vessels and in nerve pain ablation in humans, showing good results for years. Urology has used RF ablation percutaneously for treating renal tumors for years. Objective We evaluate the utilization of a new bipolar RF sealing tool for transdermal vasectomy in the rabbit model. Methods Two groups of 5 male New Zealand white rabbits were given IV sedation and local anesthetic and subsequent transdermal bilateral vasectomy using a high lateral scrotal approach. We isolated the vas with a novel insulated clamp, fitting the U-shaped electrode of the sealing tool (Figure 1) around the clamp. In Group 1 (n=5), the device was set at 60 watts for 20 seconds. In the second group (n=5), the size of the U-shaped tool jaw was reduced and the device was set at 40 and 60 watts using impedance sensing to automatically shut off energy at a predetermined level. Wound healing, complications, survival, postmortem biopsies, and histology were evaluated. A doe rabbit was used with semen collections &amp; semen analyses preformed on all male rabbits. Results We sacrificed 4 of the 5 (80%) of Group 1 rabbits due to poor wound healing due to excessive thermal damage. All 5/5 (100%) of Group 2 rabbits had good tissue healing and survived the procedure. At about 5 seconds of sealing, the impedance sensing automatically shut off power to the device in all Group 2 procedures. All rabbits had a negative semen analysis and on histology had occluded vas deferens. In bench top testing, we found that a 5 second interval is optimal for vas ligation. (Figure 1) Bench top testing revealed that thin short jaws created lower nearby tissue temperature (50 degree Celsius) than wide long jaws (77 degree Celsius). Conclusions Transdermal bipolar radiofrequency sealing successfully occludes the vas deferens in rabbit vasectomy. The jaw size and sealing time using an impedance alarm system appear to be important for wound healing. This novel technique may decrease vasectomy time and morbidity. Further studies are needed before its application in humans. Disclosure Yes, this is sponsored by industry/sponsor: Signati Clarification: Industry initiated, executed and funded study Any of the authors act as a consultant, employee or shareholder of an industry for: Signati

Challenges in rabbit doe feeding, including the young doe

In this review is summarized the last knowledge on rabbit doe nutrition, to complement the current nutritional requirements and strategies for the young and adult rabbit does, considering the production, health, and welfare issues. The rabbit doe must reach an adequate maturity level (body condition) at first artificial insemination (AI) to face its productive life with minimal guarantees (around 7.0 mm of perirenal fat thickness, 2.8 ng/mL of plasma leptin concentration and around 18% and 15-20% of body protein and fat, respectively). This goal can be achieved by restricting feed intake from 12 weeks of age until first AI or feeding ad libitum with a fibrous diet (&lt;10.5 MJ digestible energy/kg) from 60 d of age to first parturition. Once the doe is reproducing, the increase of the n-3 fatty acids (or reduction of the n-6/n-3 ratio), soluble fibre (under epizootic enteropathy) and the Arg/Lys and Gln/Lys ratios may help to improve the reproductive traits of rabbit does, although their optimal level of inclusion remain to be identified. It is recommended to limit an excessive negative energy balance before parturition, and the supplementation of glucose precursors to reduce the ketosis incidence could be useful. The formulation of different diets for the doe and the litter to fit better their requirements and assuring their health would be an option to consider when it would be applicable in the farm. The influence of the mother on the litter microbiota and immune status and its potential modulation through the diet open a new research area that will deserve more studies in the next future.

Effects of increasing levels of orange peel extract on kit growth, feed utilization, and some blood metabolites in the doe rabbits under heat stress conditions

One of the most severe consequences of climate change on the rabbit production sector is heat stress. Dietary supplementation of phytochemicals could alleviate the negative impact of heat stress on rabbits. Thirty-six V-line rabbit does with average live body weight (LBW) of 2.672 ± 0.031 kg were randomly allocated into three experimental groups as follows: the control group (OPE0) and the OPE2.5 and OPE5 groups were orally administered orange peel extract (OPE) at doses of 2.5 and 5 mL/doe. The increasing OPE levels significantly improved LBW at partum (p = 0.002) and weaning (p = 0.004), daily and total feed intake from pregnancy until weaning (p = 0.007), daily milk yield per doe at 7th and 14th days (p ≤ 0.05), and milk efficiency (p = 0.001). Litter size at 1st–28th days, litter weight gain, survival rate, and kit weight gain at 21st–28th days of heat-stressed doe rabbits were significantly improved with OPE treatments. The treatment of OPE5 significantly decreased serum glucose, triglycerides, and very-low-density lipoprotein-cholesterol levels of rabbits. The increasing OPE levels decreased significantly total lipid and low-density lipoprotein-cholesterol levels and increased (p = 0.001) high-density lipoprotein-cholesterol concentration in heat-stressed rabbits. In conclusion, the treatment of OPE improved feed utilization, milk efficiency, and reproductive performance and alleviated the drastic impacts of heat stress on rabbits.

Productive Performance of Doe Rabbits to Dietary Supplementation of Aspergillus awamori

Productive Performance of Doe Rabbits to Dietary Supplementation of Aspergillus awamori

Influence of Microalgae Nannochloropsis oculata on Blood Constituents, Reproductive Performance and Productivity in Hi-Plus Doe Rabbits Under North Sinai Conditions in Egypt

Influence of Microalgae Nannochloropsis oculata on Blood Constituents, Reproductive Performance and Productivity in Hi-Plus Doe Rabbits Under North Sinai Conditions in Egypt

Pre-mating plasma prolactin profile affects California doe rabbit reproductive performance

Ovulation failure was associated with a reduction in pre-mating concentrations of oestradiol-17β and prolactin (PRL). The present study aimed to evaluate whether pre-mating PRL levels have a role in the reproductive efficiency of doe rabbits. A total of 78 multiparous California does (2nd parity) were divided, according to plasma pre-mating PRL, into five categories, >20–25, >25–30, >30–35, >35–40, and >40–45 ng/ml. Does in all categories were naturally mated and kindled, then their reproductive measurements and progesterone (P4) levels were determined. Results show that pre-mating PRL averaged 23.60 ± 0.78, 28.00 ± 0.83, 33.46 ± 0.43, 38.17 ± 0.49 and 41.98 ± 0.68 ng/ml in five categories (p < 0.05), respectively, representing the highest distribution (38.5%) in the 3rd-category. Live body weight of doe rabbits, at mating, pregnancy, and parturition increased (p < 0.05) with increasing pre-mating PRL level. The number of services, litter size, and pregnancy rate increased (p < 0.05) by increasing PRL levels. Reproductive traits and P4 level at mid-pregnancy of does, and the average weight of kits at birth increased (p < 0.05) by increasing PRL levels. The pre-mating PRL profile is important for the identification of reproductive performance in doe rabbits.