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Asian Journal of Animal and Veterinary Advances

Year: 2011 | Volume: 6 | Issue: 10 | Page No.: 1010-1018
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Authors

Z.M. Kalaba

A.E. Abdel-Khalek

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Research Article

Effect of Repeated GnRH Injection and Intra-vaginal Mechanical Stimulation on Reproductive Performance of Doe Rabbits

Z.M. Kalaba and A.E. Abdel-Khalek
Various hormonal treatments were used for induction of ovulation to increase fertility of rabbits. Aim of the present study was to investigate the effect of repeated GnRH injections or Intra-Vaginal Mechanical Stimulation (IVMS) at mating for six consecutive litters, on fertility of naturally mated New Zealand White rabbit does. Does failed to kid after one service were mated in the next parity. Kindling Rate (KR), Number of Total (NTB) and Live Borns (NLB), Viability Rate (VR) and average Kit Weight (AKW) at birth as well as Gestation Period Length (GPL) were recorded after kidding for six consecutive parities. Also, concentrations of Follicle Stimulating Hormone (FSH) and Luteinzing Hormone (LH) were determined after mating of the 2nd litter. Results reveled that GnRH treatment showed highest (p<0.05) KR (71.4%), NTB (6.16/litter), NLB (5.53/litter) and VR (89.8%) and shortest (p<0.05) GPL (30.93 d). However, IVMS showed highest (p<0.05) AKW (66.59 g). Highest (p<0.05) VR was at the 1st and 2nd parity (87.5 and 84.5%), lowest at the 3rd parity (73.8%) and modest between 4th-6th parity. At 2, 3 and 4 h post-mating, FSH concentration was 12.04, 12.90 and 9.58 ng mL-1, while LH concentration was 16.0, 10.38 and 9.63 ng mL-1, respectively. The current study indicated that repeated injection with 0.2 mL GnRH analogue/doe (Receptal) at mating for 6 consecutive litters resulted in the best reproductive performance of rabbit does, leading to improving fertility of NZW does.
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