ملخصات الابحاث

المجالات البحثية

Effect of exogenous hormone treatments on spermatogenesis in fish
Alleviation of oxidative stress in farm amimals
Characterization of progesterone profile, physiological responses, milk composition and blood biochemical and hematological indices at the early stage of lactation in goats. Mahmoud S. El-Tarabanya, Tamer M. Abdel-Hamida, Omar A. Ahmed-Faridb, and Khaled M. Al-Marakbyc a Department of Animal Wealth Development, Faculty of Veterinary Medicine, Zagazig University, Sharkia, Egypt. b Physiology department, National Organization for Drug Control and Research (NODCAR), Cairo, Egypt. c Department of Animal production, Faculty of Agriculture, Zagazig University, Sharkia, Egypt. Abstract The aim of this research was to describe the progesterone profile, physiological response, milk composition, and blood chemistry at the early stage (DIM 30-90 days) of lactation (E1:30-50; E2:50-70; E3:70-90 days) in Baladi goats under Egyptian conditions. The serum progesterone level was significantly reduced with the progress of the early lactation period to reach the least concentration (0.24 ng/ml) at the E3 stage of lactation (P=0.001). The daily milk yield was significantly increased with the progress of the lactation to reach the peak at the E2 stage of lactation (P=0.015). The percentage of milk fat was significantly decreased with the progress of the early lactation period (P=0.032). However, the percentages of total solids and SNF were significantly increased in E2 and E3 stages when compared with the E1 stage (P=0.001 and 0.018, respectively). The serum glucose and total antioxidant capacity were considerably reduced with the progress of the lactation period (P=0.047 and 0.039, respectively). In conclusion, Baladi goats showed a decreased serum progesterone level with the progress of the early lactation period and produce milk with a relatively stable protein and lactose contents. Furthermore, Baladi does able to maintain the stability of most blood biochemical parameters during such period.
Effect of exogenous hormone treatments on spermatogenesis in male grey mullet out of the spawning season. Abdel-Halim A. El-Darawany a , Amira Moustafa b, Khaled M. Al-Marakby a, Abdel-Mageed E. Nasr a, Mohamed A. Naiel a, and Yaser H. Elewa c. a Department of Animal production, Faculty of Agriculture, Zagazig University, Sharkia,Egypt. b Department of Physiology, Faculty of Veterinary Medicine, Zagazig University, Sharkia, Egypt. c Department of Histology and Cytology, Faculty of Veterinary Medicine, Zagazig University, Sharkia, Egypt. Abstract The aim of the present study is to investigate the effects of human chorionic gonadotropin (hCG), carp pituitary extract (CPE), melatonin, and adrenal gland extract (AE) administered either separately or in combination on the induction of testicular maturation and spermatogenesis in the thin-lipped grey mullet, Liza ramada, out of its spawning season. The results revealed that testes obtained from fish out of their reproductive season have empty seminiferous tubules with germ cells or Sertoli cells markers barely expressed and a low gonadsomatic index (GSI). A significant increase in GSI levels was observed by different hormone treatments. As predicted, hormone treatments showed an obvious stimulation of germ cells proliferation and testicular maturation as indicated by the immunohistochemical expression of germ cells and Sertoli cells markers with the highest values achieved by hCG/AE treatment. We conclude that hormone treatments may be a potential strategy for the induction of spermatogenesis and testes maturation.
Effect of lunar cycle on some reproductive aspects of female goats. Abdel-Halim A. El-Darawanya, Mahmoud S.El-Tarabanyb,Khaled M. Al-Marakbya, and Mostafa A. Attac a Department of Animal production, Faculty of Agriculture, Zagazig University, Sharkia,Egypt. b Department of Animal Wealth Development, Faculty of Veterinary Medicine, Zagazig University, Sharkia, Egypt. c Biological Applications Department, Radioisotopes Applications Division, NRC, Atomic Energy Authority, Inshas, Sharkia, Egypt. Abstract The aim was to evaluate the possible effects of different lunar phases at birth on the pre-pubertal changes in the body measurements, blood parameters and hormonal profile of female goats. Based on the birth date, 36 female Nubian kids (3 months of age) were selected to equally represent the new (NL), full (FL) and old (OL) phases of the lunar cycle. Female goats in the FL group showed significantly higher body weights at weeks 20, 24 and 28 of age compared to the OL group (P = 0.050, 0.033 and 0.046,respectively). Female goats in the FL group exhibited estrus signs earlier than those in the OL group (P = 0.013). At the age of puberty, the values of Spinnbarkeit and ferning arborization of cervical mucus in the FL group were significantly greater than the NL and OL groups (P = 0.001 and 0.040, respectively). At weeks 26 and 27 of age, female goats in the FL group had significantly greater serum progesterone (P = 0.006 and 0.001, respectively) than did the NL and OL groups. In conclusion, the FL group reached the puberty at an early age and exhibited higher cyclic progesterone levels than did the NL and OL groups.
Effect of synchronization protocols on reproductive indices
Effect of synchronization protocols on reproductive indices, progesterone profile and fertility under subtropical environmental conditions in repeat breeder Holstein cows. Mahmoud S. El-Tarabany a and Khaled M. Al-Marakby b a Department of Animal Wealth Development, Faculty of Veterinary Medicine, Zagazig University, Sharkia, Egypt. b Department of Animal production, Faculty of Agriculture, Zagazig University, Sharkia,Egypt. Abstract The objectives were to evaluate the reproductive indices and survival analysis of pregnancy outcomes in multiparous repeat breeder Holstein cows (n = 557). The cows were synchronized to ovulate by Ovsynch, new controlled internal drug release device (N-CIDRsynch), and once-used CIDR device (U-CIDRsynch). The pregnancy per AI at 28 days post-insemination (P/AI 28) in the N-CIDRsynch group (28.75%) was significantly (COR = 1.49; p = 0.011) greater than that reported in the Ovsynch (23.46%) and U-CIDRsynch (21.73%) groups. Furthermore, the pregnancy per AI at day 75 post-insemination (P/AI 75) in the N-CIDRsynch group was significantly greater than the Ovysync group (COR = 1.35; p = 0.050). The repeat breeder cows received a N-CIDR device had a significantly higher progesterone level on day 2 and day 4 of CIDR insertion (1.38 and 1.67 ng/ml, respectively) than those received a U-CIDR device or the control group (p = 0.012 and 0.001, respectively). The Cox regression model recorded significant associations for synchronization protocols, THI at the TAI and season of calving with the hazard of P/AI 28 and P/AI 75 (p = 0.044 and 0.046; 0.001 and 0.005; 0.003 and 0.001, respectively). Multiparous repeat breeder cows (>3) had a lower hazard ratio (HR) of P/AI 28 than that reported in the reference (2nd parity) group (HR = 0.74, p = 0.050). The repeat breeder cows inseminated at 76–80 and >80 temperature-humidity index (THI) had significantly lower HR of P/AI 28 than those inseminated at the baseline (<70) THI value (HR = 0.73 and 0.30, p = 0.036 and 0.001, respectively). The current results indicate that the use of N-CIDR synch protocol may achieve satisfactory pregnancy outcomes in repeat breeder cows.

الابحاث العلمية

1 - Impact of Salix mucronata bark and betaine as natural alleviators on semen quality, serum biochemistry, and oxidative capacity in heatstressed rabbit bucks (2025).

2 - The Effect of Adding Multi-Strain Probiotics (MSP) on the Hematological, Immunological and Antioxidant Parameters of Male Saidi Sheep (2025).

3 - Cerium Oxide Nanoparticles Improve Semen Quality and Antioxidant Status of Rabbit Bucks during Cold Storage (2025).

4 - Effects of quadric probiotic blends on rumen fermentation, nutrient degradability, and methane emission in sheep: an in vitro study (2025).

5 - Impact of grape seed extract on growth, blood health, immunity, and inflammation in environmentally stressed rabbits. (2025).

6 - Impact of probiotic blend on rumen fermentation, nutrient digestibility, and blood biochemistry in sheep. (2025).

7 - Probiotic supplementation in sustainable sheep production: impacts on health, performance, and methane mitigation (2025).

8 - The supplementation of dietary black cumin (Nigella sativa) seeds on performance, blood hematology, post-metabolic responses, antioxidant status, immunity, and inflammatory markers in pre-weaning calves. (2025).

9 - Effect of Replacement of Fish Meal by Corn by Product Meal on Growth Performance For Nile Tilapia (Oreochromis Niloticus ) (2025).

10 - The use of Moringa leaves extract in rabbit diets: its effect on performance, lipid profile, kidney and liver function, immunity, antioxidant, digestive enzymes, and cecal microbiota. (2025).

11 - Dietary supplement guava leaf extract regulates growth, feed utilization, immune function, nutrient digestibility and redox regulation in growing rabbits (2024).

12 - Effect of interleukin 6 (IL-6) on sperm quality, kinematic parameters, acrosome integrity, apoptosis, ultrastructure, and molecular docking in cryopreserved ram spermatozoa (2024).

13 - Effect of environmental thermal stress on reproductive performance of Holstein cows in Egypt (2023).

14 - EFFICACY OF USING PROBIOTICS CONTAINING Bacillus subtilis AND Bacillus licheniformis SPORES ON PERFORMANCE AND HEALTH OF HOLSTEIN SUCKLING CALVES (2022).

15 - Effect of Folic Acid Supplements on Progesterone Profile and Blood Metabolites of Heat-Stressed Holstein Cows during the Early Stage of Pregnancy (2022).

16 - Influence of fish meal replacement with graded levels of corn gluten meal on performance, feed efficiency, body chemical analysis and economic revenue of the Nile tilapia fish Oreochromis niloticus (2022).

17 - Effect of some chemical and biological treatments on the chemical composition, cell wall constituents and in situ degradability of olive cake nutrients (2020).

18 - Impact of lunar phase at birth on testicular morphology, semen characteristics and blood chemistry of male goats (2019).

19 - Effect of lunar cycle on some reproductive aspects of female goats (2019).

20 - Impact of Distiller's Dried Grains with Solubles on Health and Performance of Nile Tilapia (Oreochromis niloticus) Fish (2018).

21 - Effect of synchronization protocols on reproductive indices, progesterone profile and fertility under subtropical environmental conditions in repeat breeder Holstein cows. (2018).

22 - Characterization of progesterone profile, physiological responses, milk composition and blood biochemical and hematological indices at the early stage of lactation in goats. (2018).

23 - Influence of distiller's dried grains with solubles on growth, feed utilization and economic efficiency of Nile tilapia (Oreochromis niloticus) diets (2018).

24 - Induction of ovulation in liza ramada (risso, 1826) out of season (2016).

25 - Effect of exogenous hormone treatments on spermatogenesis in male grey mullet out of the spawning season (2016).

26 - Effect of Roxazyme addition to diets contained different barley levels on productive performance of Nile tilapia (2011).

27 - Effect of feeding biologically treated wheat straw on production performance of sheep (2003).

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