Effect of Gonadotrophin Releasing Hormone (GnRH) on the Reproductive Performance in Ossimi Ewes

Journal of Veterinary Medical Research

article

Mostafa Mohamed Farghal¹  Ahmed Mostafa¹ 

[1] Department of Animal Behaviour, Management and Development of Animal Wealth, Faulty of Veterinary Medicine, Minia University

关键词: Birth Weight;    GnRH;    Prolificacy;    Ossimi Ewes;   

DOI  :  10.21608/jvmr.2022.142123.1058

学科分类：社会科学、人文和艺术（综合）

来源: Beni-Suef University

【 摘 要 】

This study aimed to evaluate the influence of gonadotrophin releasing hormone(GnRH) administration to Ossimi ewes before mating on their conception, lambingand prolificacy rates, and their mean lambs’ birth weights. Twenty-one (three to fiveyears old) Ossimi ewes and five (three to four years old) rams, (58.6±4.75kg) wererecruited for this study. Ewes were allocated into three groups (7 ewes each) andsynchronized with two doses of prostaglandin F2 alpha (PGF2 α) 11 days apart. Ewesof the first group (35.3±5.62kg) were flushed with corn (0.5 kg/ewe/day) for twoweeks before and two weeks after mating, while ewes of the second group(37.37±7.03kg) received one ml of GnRH, 24 hours after the second dose of PGF2α.Ewes of the third group (35.28±4.11kg) served as a control. Results of this studyillustrated that GnRH group had higher conception (85.71%) and lambing (85.71%)rates than corn (71.43%, 71.43%) and control (42.85%, 42.85%) groups respectively.But the difference was not significant (p > 0.05). Prolificacy rate (100%) was the samefor all groups (p > 0.05); there was no twin lambing in all groups. Also, the meanlambs’ birth weight was non-significantly (p > 0.05) higher in GnRH (1.88 kg) than corn(1.82 kg), and control (1.87 kg) groups respectively. In conclusion, administration ofGnRH to Ossimi ewes before breeding non-significantly enhanced their conceptionand lambing rates, and the effect on mean lambs’ birth weights was very limited.

【 授权许可】

CC BY