Patel O V, Takahashi T, Takenouchi N, Hirako M, Sasaki N, Domeki I
Department of Veterinary Surgery and Obstetrics, Faculty of Agriculture, University of Tokyo.
Br Vet J. 1996 Jul;152(4):425-32. doi: 10.1016/s0007-1935(96)80036-4.
This study characterized the peripheral plasma cortisol profile throughout gestation and examined the effect of stage of gestation and foetal number in Holstein cows after non-surgical embryo transfer. Cows (n = 10) were divided into two groups: Group 1 = single embryo recipient cows (n = 5); and group 2 = twin-embryo recipient cows (n = 5). Mean plasma cortisol concentrations remained basal (2-4 ng ml-1) in both groups up to 2 days prepartum increased significantly (P < 0.05) to peak at parturition day, and then declined rapidly 1 day post-partum. Twin-bearing cows had significantly (P < 0.01) higher mean plasma cortisol concentration on the day of parturition than in the singleton cows. There was no effect of the stage of gestation on cortisol levels in either group (P > 0.1), except in the last 48 h prior to parturition. A single cow giving birth prematurely had 100% higher plasma cortisol levels on the day of parturition and 1 day post-partum than cows giving birth at term.
本研究描述了整个妊娠期外周血浆皮质醇水平，并研究了非手术胚胎移植后荷斯坦奶牛的妊娠阶段和胎儿数量对其的影响。将奶牛（n = 10）分为两组：第1组 = 单胚胎受体奶牛（n = 5）；第2组 = 双胚胎受体奶牛（n = 5）。两组奶牛在产前2天内血浆皮质醇平均浓度均维持在基础水平（2 - 4 ng/ml），在分娩日显著升高（P < 0.05）至峰值，然后在产后1天迅速下降。双胎奶牛在分娩日的血浆皮质醇平均浓度显著高于单胎奶牛（P < 0.01）。除分娩前最后48小时外，妊娠阶段对两组奶牛的皮质醇水平均无影响（P > 0.1）。一头早产奶牛在分娩日和产后1天的血浆皮质醇水平比足月分娩的奶牛高100%。
