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. 1981 Sep;5(1):77-84.
doi: 10.1007/BF02214972.

Vaginal electrical resistance in cows: 2. Relationship to milk progesterone concentrations during the reproductive cycle

W J McCaughey, A D Patterson

Vaginal electrical resistance in cows: 2. Relationship to milk progesterone concentrations during the reproductive cycle

W J McCaughey et al. Vet Res Commun. 1981 Sep.

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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