Effect of melatonin implantation prior to ovsynch plus cidr protocol on subsequent ovarian activity and pregnancy rate in summer anestrous Murrah buffaloes
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引用次数: 0
Abstract
For assessing the impact of melatonin pre-treatment in summer anestrous Murrah buffaloes on subsequent reproductive activity of a fixed time artificial insemination (FTAI) protocol, 83 anestrous Murrah buffaloes were subcutaneously inserted 2x4 mm size absorbable melatonin (MT) implants (18 mg/50 kg b wt) at the base of left ear and 38 Murrah buffaloes were used as non-implanted controls. On day 35 post-MT, the treatment and control group Murrah buffaloes were subjected to FTAI protocol (Ovsynch plus CIDR). Ovarian ultrasonography and jugular vein blood sampling was carried out on day 7 and 10 of protocol and on day 7-post AI. Overall pregnancy rate on day 90 post-AI in MT group was higher compared to control group (55.4 vs 31.6%, P<0.05), along with the higher (P>0.05) plasma progesterone on day 7 of FTAI protocol in Murrah buffaloes of the former group which conceived subsequently compared to their non-pregnant counterparts. Moreover, MT group had higher (P>0.05) increase in dominant follicle diameter between day 7 and 10 of protocol compared to control group. On day 7 post-AI, the luteal profile in pregnant murrah buffaloes of MT group was better (P<0.05) compared to their counterparts in control group (CL: 14.80±0.70 vs 10.82±0.46 mm, P4: 1.54±0.07 vs 1.04±0.08 ng/ml). In conclusion, melatonin pre-treatment in summer anestrous Murrah buffaloes could be associated with better luteal activity and higher pregnancy rate in the Ovsynch+CIDR protocol.
为了评估夏季麻醉的Murrah水牛褪黑激素预处理对固定时间人工授精(FTI)方案后续生殖活动的影响,在左耳底部皮下植入83头麻醉的Murah水牛,植入尺寸为2x4mm的可吸收褪黑激素(MT)植入物(18 mg/50 kg b wt),38头Murrah野牛作为非植入对照。MT后第35天,治疗组和对照组Murrah水牛接受FTAI方案(Ovsynch加CIDR)。在方案的第7天、第10天和AI后第7天进行卵巢超声和颈静脉抽血。MT组在AI后第90天的总妊娠率高于对照组(55.4%对31.6%,P0.05),前者的Murrah水牛在FTI方案的第七天的血浆孕酮水平高于未怀孕的水牛。此外,与对照组相比,MT组在方案的第7天和第10天之间的优势卵泡直径增加更高(P>0.05)。在AI后第7天,MT组的妊娠水牛黄体轮廓比对照组更好(P<0.05)(CL:14.80±0.70vs10.82±0.46mm,P4:1.54±0.07vs1.04±0.08ng/ml)。总之,在Ovsynch+CIDR方案中,夏季麻醉的Murrah水牛的褪黑素预处理可能与更好的黄体活性和更高的妊娠率有关。
期刊介绍:
Buffalo Bulletin is published quarterly in January-March, April-June, July-September and October-December. Contributions on any aspect of research or development, progress reports of projects and news on buffalo will be considered for publication in the bulletin.