title: Plasma progestagens in the pregnant mare in the first and last 90 days of gestation.
abstract: Plasma progestagens were measured in eighteen pregnant mares to establish normal levels in the first and last 90 days of gestation. Progestagens increased from 25 ng/ml at 90 days before birth to 60 ng/ml at 10 days before birth, decreased to 58 ng/ml at 5 days before, and were 3 ng/ml or less by 5 days after perturition. During the first 90 days of pregnancy, progestagens reflected luteal activity with an increase in plasma levels from Day 30 to Day 60.
mesh_terms: D000818:Animals; D005260:Female; D006736:Horses / Q000097:blood*; D010060:Ovulation; D049590:Postpartum Period; D011247:Pregnancy; D011270:Pregnancy, Animal; D011372:Progestins / Q000097:blood*; D013997:Time Factors
chemical_list: D011372:Progestins