Effect of Dosage Levels FSH on Superovulation in Fat Japanese Black Beef Cattle

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  • 豚下垂体前葉性卵胞刺激ホルモンの投与量が黒毛和種過肥牛への過剰排卵に及ぼす影響
  • 豚下垂体前葉性卵胞刺激ホルモンの投与量が黒毛和種過肥牛の過剰排卵に及ぼす影響
  • ブタ カスイタイ ゼンヨウセイ ランポウ シゲキ ホルモン ノ トウヨリョウ

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Abstract

Fifty-three fat Japanese black beef cattles force-fed after calving were superovulated with porcine follicle stimulating hormone (FSH-P). Numbers of recovered embryos and transferrable embryos increased following treatment with 15 mg of FSH as compared to 28 mg [9.9 ± 6.1 (mean ± SD) and 7.8 ± 5.2 vs. 6.0 ±3.6 and 2.8 ± 2.1, respectivefly]. The ratio of transferrable embryos to recovered ova and embryos was significantly higher (p < 0.05) in cattles treated with 15 mg of FSH (79%, 94/119) than in cattle with 28 mg (46%, 113/246). However, percentages of cattles with no recovered embryos and non-transferrable embryos were 17%(7/41) and 32%(13/41), respectively, when treated with 28 mg of FSH. Transferrable embryos were recovered from all cattles treated with 15 mg of FSH. These results indicate that the low dosage of FSH is useful for superovulation in fat Japanese black donors.

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