Abstract
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.
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McCaughey, W.J., Patterson, A.D. Vaginal electrical resistance in cows: 2. Relationship to milk progesterone concentrations during the reproductive cycle. Vet Res Commun 5, 77–84 (1981). https://doi.org/10.1007/BF02214972
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DOI: https://doi.org/10.1007/BF02214972