Vaginal electrical resistance in cows: 2. Relationship to milk progesterone concentrations during the reproductive cycle.
When the vaginal electrical resistance (VER) was measured in the anterior vagina in 4 cows during a total of 12 oestrous cycles, there was a close correlation between VER, milk progesterone levels and visual observations of oestrus. The cyclic changes in both VER and milk progesterone ceased in 2 cows which became pregnant during the study. In a pregnant cow, the VER was found to be constant both pre-partum and immediately post-partum. These results show that measurement of VER can be a useful aid in the confirmation of oestrus and suggest that the technique may also be applicable to the early diagnosis of pregnancy.
D000818:Animals; D002417:Cattle / Q000502:physiology*; D004553:Electric Conductivity; D004566:Electrodes / Q000662:veterinary; D004971:Estrus; D005260:Female; D007315:Insemination, Artificial / Q000662:veterinary; D008892:Milk / Q000378:metabolism*; D009092:Mucous Membrane / Q000502:physiology; D011247:Pregnancy; D011270:Pregnancy, Animal; D011374:Progesterone / Q000378:metabolism*; D014621:Vagina / Q000502:physiology*; D014844:Vulva / Q000502:physiology
D011374:Progesterone