屡配不孕母牛发情开始后八天内血清雌二醇和孕酮含量的变化

CHANGES OF SERUM OESTRADIOL AND PROGESTERONE LEVELS IN REPEAT BREEDERS DURING THE FIRST 8 DAYS FOLLOWING OESTRUS

本实验采用放射免疫测定技术(RIA)分析了9头屡配不孕母牛和6头正常母牛于发情开始后8天内的血清雌二酵和孕酮含量的变化。测定结果表明:屡配不孕母牛发情开始时的血清雌二醇水平低于正常母牛(7.4±3.4pg/ml VS 14.2±6.3pg/ml p<0.025)。发情开后96小时内屡配不孕母牛的血清孕酮水平的变化范围为0.90～1.76ng/ml,正常母牛的变化范围为0.68～1.00ng/ml。发情开始后192小时,正常母牛的血清孕酮水平已经达到2.47±2.02ng/ml,而屡配不孕母牛的血清孕酮水平则为1.97±0.60ng/ml。实验结果指示:体内内分泌失调可能是导致母牛屡配不孕的重要原因之一。

Radioimmunoassay (RIA) was introduced to determine the serum oestradiol and progesterone levels of 9 dairy repeat breeders (RB) and 6 normal cows (NC) from day O to day 7 of the cycle. The average serum oestradiol level of RB was lower than that of NC on day 7 (7.4 ± 3.4pg/ml vs. 14.2±6.3pg/ml) (P<0.025). As to serum progesterone level, it was higher in RB than in NC during the interval 0-96 hr. after oestrus (0.90 -1.76ng/ml vs ,0.68-l.00ng/ml) then became lower at 192 hr. aftero oestrus (1.97 ± 0.60ng/ml vs. 2.74 ±2.02ng/ml) (P>0.05). The results suggests thathormonal asynchrony may be an important cause for dairy repeat breeding.