牛の過剰排卵誘起処置に対する卵巣反応に影響を及ほす要因

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  • Factors affecting superovulation response in cattle.
  • 牛の過剰排卵誘起処理に対する卵巣反応に影響を及ぼす要因〔英文〕
  • ウシ ノ カジョウ ハイラン ユウキ ショリ ニ タイスル ランソウ ハンノウ

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Seveal factors were evaluated to investigate the cause of variability of the ovarian response to superovulation treatment in 312 Holstein heifers and cows. Data from each donor were classified into 8 variables: places, parity, months, days since calving, gonadotropins used, superovulation treatment days in the estrous cycle, ovulation stimulating preparations and serum total cholesterol. Comparison of the number of embryos between levels of each qualitative variable was performed in animals which had a serum total cholesterol level of 90mg/dl and over in heifers and of 130mg/dl and over in cows. Comparison between ovulation stimulating preparations was also performed in animals which had a serum total cholesterol level of less than 90mg/dl in heifers and of less than 130mg/dl in cows. The percentages of heifers and cows in which over 3 transferable embryos were obtained were higher in the heifers with a serum total cholesterol level of 90mg/dl and over and in the cows with 130mg/dl and over, respectively, as compared to the heifers with less than 90mg/dl and to the cows with less than 130mg/dl. Significant difference in the number of recovered and transferable embryos was observed between the ovulation stimulating preparations. However, in the present study, there were no significant differences between the levels in the other qualitative variables.

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