Induction of estrus and rate of conception in cows treated with a prostaglandin F<SUB>2α</SUB> analogue (ONO 1052)

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  • プロスタグランジンＦ?S２α?Tアナログ（ＯＮＯ１０５２）によるウシの発情誘発と受胎成績
  • Prostaglandin F2アルファ analogue ONO 1052

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Seventy two dairy cows with persistent corpus luteum or corpus luteum cysts were given 800 μg of prostaglandin F2α analogue (ONO 1052) to induce estrus and following results were obtained:<BR>1. Estrus was induced in 67 (93.1%) out of 72 cows. Forty six (70.8%) out of 65 cows in-seminated at the first estrus after the treatment became pregnant. By repeated insemination, finally 62 (86.1%) out of 72 cows became pregnant.<BR>2. The conception rate was the highest (10/11, 90.9%), in the cows with poor estrous signs followed by the group of excellent estrous signs (7/8, 87.5%), and good estrous signs (28/45, 62.2%).<BR>3. The conception rate was the highest (14/15, 93.3%) in the cows with small follicles, followed by those with medium ones (27/40, 67.5%), and large ones (4/9, 44.4%).<BR>4. The relations between the days from the treatment to ovulation and the ratio of pregnant vs total cows were: 3 days 2/2, 4 days 13/19, 5 days 21/27, 6 days 6/8, 8 days 0/1, and for 9, 10 and 12 days 1/1 each.

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