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. 1990 Dec 1;31(4):441–444. doi: 10.1186/BF03547526

Milk and Serum Progesterone Levels in Mares after Ovulation

Progesteronnivåerna i serum och mjölk hos ston efter Ovulationen

Erkki Koskinen 1,✉, Heli Lindeberg 1, Helena Kuntsi 1, Terttu Katila 1
PMCID: PMC8133153  PMID: 2099621

Abstract

Twenty-four Finnhorse mares were examined by rectal palpation and ultrasonography every 6 h during late oestrus to determine the time of ovulation. Milk and serum samples were collected every 6 h after the detected ovulation for progesterone analysis. The progesterone rises took place within 0–54 h and 0–60 h after ovulation, in milk and serum, respectively.

Statistically significant differences (p < 0.05) in progesterone levels were observed for the first time 12–18 h and 18–24 h after ovulation, in serum and milk, respectively, as compared to progesterone levels 0–6 h after ovulation.

Keywords: timing ovulation, luteal activity

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