Testosterone and progesterone in peripheral plasma during the oestrous cycle of the mare.
Measurements every day or every other day showed that testosterone levels ranging from 15 to 70 pg/ml were higher at oestrus in 4 of the 6 mares studied. In these 4 mares, another testosterone peak occurred 11--13 days before the next oestrus either before (3 mares) or after the fall in progesterone levels.
D000818:Animals; D004971:Estrus; D005260:Female; D006736:Horses / Q000097:blood*; D011247:Pregnancy; D011374:Progesterone / Q000097:blood*; D013739:Testosterone / Q000097:blood*; D013997:Time Factors
D013739:Testosterone; D011374:Progesterone