Shih-tzu견에서 혈장 progesterone과 estradiol-17β 농도 측정에 의한 배란시기 및 교배적기의 추정

초록

The aim of this study was to estimate the time of ovulation and mating derived by plasma progesterone and estradiol-17b concentrations. The 11 pregnant Shih-tzu bitches were investigated the plasma progesterone and estradiol-17b concentrations from proestrus to parturition. Gestation length in the 11 pregnant bitches was 61.9± 1.1 (mean±SD) days when Day 0 was timed from the day that plasma progesterone concentration was first increased above 4.0ng/ml. The litter size was 3.8±0.3 pups. Plasma progesterone concentrations were increased at the first day of vulvar bleeding and showed at Day 0 with 5.2±0.3ng/ml. It was gradually increased to reach a peak at Day 15 with 42.6±3.7ng/ml, thereafter it was gradually decreased to below Day 62. Plasma estradiol-17b concentrations were increased above 1.0pg/ml at the first day of vulvar bleeding and showed a peak at Day -2 with 33.5±8.0pg/ml, thereafter it was gradually decreased. When Day 0 was timed from the day that plasma progesterone concentration was first increased above 4.0ng/ml, plasma estradiol-17b concentration reached a peak at Day -2. In conclusion, these results indicated that ovulation was estimated to occur the day when plasma progesterone concentration was first increased above 4.0ng/ml after the first day of bleeding. It was estimated that mating time was the day when plasma progesterone concentration was between 3.0~8.0ng/ml.

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