Associations of estrus detection procedures with the calving rate in Japanese Black cattle

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  • Kino E.
    Department of Animal and Grassland Sciences, Faculty of Agriculture, University of Miyazaki
  • Uematsu M.
    Miyazaki Agricultural Mutual Aid Association
  • Kitahara G.
    Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki Center for Animal Disease Control, University of Miyazaki
  • Osawa T.
    Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki Center for Animal Disease Control, University of Miyazaki
  • Sasaki Y.
    Department of Animal and Grassland Sciences, Faculty of Agriculture, University of Miyazaki Center for Animal Disease Control, University of Miyazaki

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  • 黒毛和種牛における発情発見方法と分娩率との関連性
  • クロゲワシュギュウ ニ オケル ハツジョウ ハッケン ホウホウ ト ブンベンリツ ト ノ カンレンセイ

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Abstract

<p>　The objective of the present study was to assess the relationship between the estrus detection method and the calving rate in Japanese Black cattle in 272 farms in Miyazaki Prefecture. Farms that used bellowing to detect estrus had a higher mean calving rate than those that did not rely on bellowing（53.1 ± 0.9% vs. 50.2 ± 0.9%; p = 0.02）. In addition, farms that detected estrus based on mucus characteristics alone had a lower mean calving rate than those that used multiple procedures such as bellowing, behavioral assessment and mucus characteristics（p < 0.05）. In conclusion, heat detection based on bellowing was one of the good methods that was associated with high calving rate.</p>

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