Bovine vaginal circulation: changes during estrous cycle.
Vaginal thermal conductance was measured in 12 heifers and 7 cows with a gradient layer heat flow probe. Values rose for 4 to 5 days prior to day of behavioral estrus (day 0), with a peak on days --2 and --1, and then declined from day 0 to +5. Curves for heifers were higher than those for cows although there was no evidence that they were not parallel. Changes during the cycle appear to result from estrogen-induced alterations in blood flow rate in vaginal tissues.
D000367:Age Factors; D000818:Animals; D001775:Blood Circulation; D001783:Blood Flow Velocity; D002417:Cattle / Q000502:physiology*; D004967:Estrogens / Q000502:physiology; D004971:Estrus; D005260:Female; D006940:Hyperemia; D011247:Pregnancy; D013814:Thermal Conductivity; D014621:Vagina / Q000098:blood supply* / Q000502:physiology
D004967:Estrogens