摘要
通过３３２头奶牛孕酮含量变化周期的分析，获得孕酮谷点超前、居中和滞后３种模式，其排卵对应有超前、适中和延缓３种。这３种模式的奶牛情期受胎率分别为１９．２％，６３．６％和４１．４％。奶牛配种后，怀孕和未孕对孕酮含量变化有影响：怀孕牛，配种后从孕酮谷点至第１４天孕酮含量有提高（Ｐ＜０．０５），特别是第１４天提高更显著（Ｐ＜０．０１）；未孕牛，配种后除谷点处孕酮含量较一致外，其余各处平均值都下降（Ｐ＜０．０５）。
After analyzing progesterone(P 4) cycles of 332 dairy cows,preceding ,middle and later P 4 valley-points were determined and there were early,proper and delayed ovulation accordingly.Conception rates of these three pattems were 19.2%,63.6% and 41.4%,respectively,Pregnancy or nonpregnancy after artificial insemination(AI) had effects on following milk P 4 concentrations:comparing with the controlled group,pregnant cows after AI,P 4 concentrations were increased (P<0.05)from valley point to Day 14,especially Day 14(<0.01);nonpregnant cows after AI,P 4 concentrations were decreased (P<0.05)except of valley point concentrations which were kept the same level.
出处
《中国畜牧杂志》
CAS
北大核心
1999年第2期15-17,共3页
Chinese Journal of Animal Science
关键词
奶牛
孕酮
配种
繁殖率
Dairy cows Progesterone AI Reproductive rate
