Peripheral plasma estrogen and progesterone levels during the estrous cycle and early pregnancy in the cow

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Peripheral plasma estrogen and progesterone levels in the cow during the estrous cycle and early pregnancy were determined by radioimmunoassay. In six cows showing normal estrous cycle, blood level of estrone and estradiol fluctuated with almost same patterns, but the concentration of estradiol was generally higher than that of estrone in three of six cows. Level of total estrogen formed a medium peak (9.010.5 pg/ml) during luteal stage of 312 days after ovulation, and a sharp peak (10.619.5 pg/ml) in proesturs, 31 days before next ovulation. In three other cows, no increase in total estrogen was found during luteal stage, but, they showed its sharp and high peak (12.720.0 pg/ml) 21 days before next ovulation. Plasma pro-gesterone showed its minimum level (0.20.3 ng /ml) at estrus and maximum level (1.84.2 ng/ml) during luteal stage of 1117 days after ovulation. It began to decrease rapidly 4 to 5 days before next ovulation. In five cows of early pregnancy, within 32 days after insemination, plasma estradiol showed higher level than that of estrone. In two of them, concentration of total estrogen increased (12.4 and 7.2 pg/ml) temporarily 5 days after insemination, but it maintained of low level (2.36.0 pg/ml) until about 12 days after insemination in three others. Thereafter, the level of total estrogen rose gradually in all of them and showed considerable high level (6.211.6 pg/ml) 2728 days after insemination. Concentration of plasma progesterone increased rapidly after the ovulation and showed higher level of 6.0±1.7 ng/ml at 31-32 days of pregnancy than that in luteal stage of the estrous cycle.
日本繁殖生物学会の論文

Peripheral plasma estrogen and progesterone levels during the estrous cycle and early pregnancy in the cow

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日本繁殖生物学会 | 論文

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