Abstract
Estrogen and progesterone in milk during the first 21 days of induced and postpartum lactation in Holstein cows and heifers were estimated by assay procedures. Lactation was induced with estradiol-17β and progesterone treatment for 7 days. Estrogen and progesterone in induced lactations differed from concentrations in postpartum lactations. In early lactation estrogen was higher in postpartum milk (521±103 pg/ml on day 1) than in induced milk (336±46 pg/ml on day 1), but after day 7 the reverse was true (192±33 pg/ml and 233±32 pg/ml on day 7). Progesterone remained higher in induced lactation through the first 21 days than in postpartum lactation with the exception of day 19. Progesterone in postpartum milk increased from 4±1ng/ml on day 1 to 11±2ng/ml on day 21. Progesterone in induced milk showed greater fluctuation (11±3ng/ml on day 1 and 22±9ng/ml on day 3) but gradually decreased to 12±2ng/ml on day 21 (11±2ng/ml on day 21 of postpartum lactation).
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