Batra S K, Arora R C, Bachlaus N K, Pandey R S
J Dairy Sci. 1979 Sep;62(9):1390-3. doi: 10.3168/jds.S0022-0302(79)83434-7.
Changes in progesterone concentration of blood and milk were measured by radioimmunoassay in 10 Murrah buffalo up to 40 days after insemination. Progesterone concentration in blood plasma at estrus was .1 ng/ml which rose to a peak of 3.6 ng/ml on day 13. It continued to increase in animals that conceived but dropped to .6 ng/ml on 3 days before next estrus in those that failed to conceive. The average concentration of progesterone in milk was .5 ng/ml at estrus; it increased to 18 ng/ml on day 15, and thereafter it declined to 4.4 ng/ml 3 days preceding next estrus in nonpregnant animals. In pregnant animals, it was maintained and elevated further to 24.8 ng/ml on day 37. Progesterone in milk was four to five times higher than in blood plasma.
采用放射免疫分析法测定了10头摩拉水牛在授精后40天内血液和乳汁中孕酮浓度的变化。发情期血浆中孕酮浓度为0.1 ng/ml，在第13天升至3.6 ng/ml的峰值。受孕的动物中孕酮浓度持续升高，但未受孕的动物在下一次发情前3天降至0.6 ng/ml。发情期乳汁中孕酮的平均浓度为0.5 ng/ml；在第15天升至18 ng/ml，此后在未怀孕的动物中，在下一次发情前3天降至4.4 ng/ml。在怀孕的动物中，孕酮浓度维持不变，并在第37天进一步升至24.8 ng/ml。乳汁中的孕酮比血浆中的高4至5倍。
