【摘要】 应用放射免疫分析法(RIA)测定了21头黑白花奶牛怀孕期间外周血浆和乳汁孕酮水平的变化和193头奶牛输精后21、24、28及56天奶桶混合乳的孕酮含量。结果表明,在妊娠期间,血浆和乳汁孕酮水平的变化呈高度正相关。分析193头母牛输精后21、24,28及56天的奶样查出。已孕和未孕母牛孕酮含量的临界值为6ng/ml;用这一数值作为诊断妊娠的标准。并以193头母牛的乳汁孕酮含量验证,其结果是输精后21、24及28天采样检查三次,诊断为妊娠的准确率为90.0％,未孕的准确率为95.0％.更多还原

【Abstract】 Profiles of progesterone in peripheral blood plasma and milk during pregnancy in 21 Holstein-Friesian cows and in pooled bucket milk in 193 Holstein-Fr iesian cows on day 21, 24, 28 and 56 after insemination were investigated by RIA. The results showed that there is a highly positive correlation between blood plasma and milk concentrations of progesterone during pregnancy. It is concluded from analysis of milk samples on day 21, 24, 28 and 56 after insemination in 193 cows that the critical value of progesterone between pregnant and cyclic cows is 6 ng/ml; using this value as a standard, the correct rate of pregnancy diagnosis for pregnant and non-pregnant cows is 90.0% and 95.0% respectively on day 21, 24 and 28 after insemination.更多还原