The Effects of Labial Stimulation after Artificial Insemination on Conception Rates in Holstein Heifers

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  • 乳用未経産牛の人工授精直後の陰唇刺激が受胎率に及ぼす効果
  • ニュウヨウ ミケイサンギュウ ノ ジンコウ ジュセイ チョクゴ ノ インシン シゲキ ガ ジュタイリツ ニ オヨボス コウカ

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Abstract

The present experiment was conducted to assess the effects of labial stimulation after artificial insemination (AI) on the conception rate in Holstein cattle. In this experiment, 295 heifers were randomly assigned to a control group and an exposure group. The labia of the heifers in the exposure group were stimulated for 15 seconds after AI. The conception rates in heifers in the exposure group (69.2%) tended to be higher than those in the control group (64.7%). The conception rate of heifers in the control from July to August tended tobe lower, but this tendency was not observed in heifers in the exposure group. When we analyzed the effect of the efficiency of labial stimulation on the Temperature-Humidity Index (THI), the conception rates in the control in THI ≥z 72 group (46.8%) were significantly lower (P<0.01) than those in the THI <72 group (73.9%). However, this difference was not observed in the exposure group.

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