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Articles by Amira M. Mansour
Total Records ( 1 ) for Amira M. Mansour
  I.T. El-Ratel , Tork M. Dorra , M.A. Sheteifa and Amira M. Mansour
  Background and Objective: Ovulation and fertilization rates in rabbits are the most important traits which affect directly the viability of their youngs and litter size at birth. This study was carried out to evaluate different reproductive performance parameters of doe rabbits injected with receptal (GnRH analogue) at mating on day 0, 5 or 10 of post-partum. Methodology: Total of 48 sexually mature NZW rabbit does were divided into two groups, control (n = 24) and GnRH (n = 24). The 1st group was i.m., injected with 0.25 mL saline/doe at mating, while the 2nd was injected with 0.25 mL receptal/doe at mating. Immediately after injection, all does were allowed to natural mating by fertile bucks. Does in each of control and GnRH groups were divided into 3 sub-groups (n = 8) to mate on days 0, 5 and 10 post-partum. After parturition, kindling rate, litter size at birth (total and live) and weaning as well as viability rate were recorded. Blood samples were collected from does in each group for progesterone determination in blood serum. Results: Overall mean of all reproductive performance parameters were better (p≥0.05) in GnRH than in control group, the best for does mated on day 10 post partum, while the poorest for those mated on day 5. The effect of interaction between GnRH treatment and mating day was not significant on all reproductive performance parameters. Overall mean of progesterone concentration in serum was not affected by GnRH treatment pre-mating (0 day) and on 7 day post-mating. On days 14, 21 and 28 post-mating, progesterone was higher (p<0.05) in GnRH than in control and in does mated on day 10 post-mating as compared to other mating days. Conclusion: Rabbit does injected with GnRH analogue (0.25 mL receptal/doe at mating) on day 10 post-partum resulted in remarkable improvement in in vivo reproductive performance in terms of higher kindling rate, litter size and kid viability rate at birth and weaning.
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