定時人工授精後のプロジェステロン製剤留置が黒毛和種牛の繁殖成績に及ぼす影響 Effect of CIDR Inclusion After Timed Artificial Insemination on Reproductive Performance in Japanese Black Cows

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定時人工授精(AI)後,腟内のCIDR 留置が黒毛和種牛の繁殖成績に及ぼす影響を検討した.正常分娩後1カ月から全頭に排卵同期化,定時AI を行い,その後17日から7日間,腟内にCIDR留置するCIDR群(n=28)と,無処置とする対照群(n=47)に分けた.定時AI の受胎率はCIDR群64.3%,対照群53.2%であった(<i>P </i>=0.34).定時AIで不受胎の牛の発情回帰日数はそれぞれ28.7±3.9日,33.0±26.9日(<i>P </i>=0.22)と両群は不等分散で(<i>P </i><0.01),変動係数はそれぞれ0.1,0.8であった.CIDR群で抜去後7日以内,対照群で定時AI後18日から24日に再AIした牛の受胎率は,CIDR群85.7%,対照群58.3%であった(<i>P</i>=0.47).分娩後早期の黒毛和種牛において,定時AI後17日から7日間のCIDR留置は,不受胎の牛において発情回帰日数の分散を縮小させた.

The effect of CIDR inclusion for seven days after timed artificial insemination (TAI) on reproductive performance was determined in Japanese Black cows. Ovulation was synchronized at one month after normal parturition and was subjected to TAI. Cows were divided into two groups with CIDR inclusion for 7 days at 17 days after TAI (n =28) or controls without CIDR (n =47). Conception rates with TAI were similar (CIDR 64.3% vs. controls 53.2%, <i>P </i>=0.42). The date of return of estrus in open cows were similar (CIDR 28.7 ± 3.9 days vs. control 33.0 ± 26.9 days, <i>P </i>=0.22), however there was heteroscedasticty in these groups (<i>P </i><0.01), and the coefficient of variation in CIDR was smaller than in the control. The conception rates of re-AI in open cows both within 7 days after CIDR removal in CIDR and from 18 days to 24 days after TAI in controls were similar. (CIDR 85.7% vs. control 68.3%, <i>P </i>=0.47). The inclusion of CIDR for 7 days at 17 days after TAI reduced the dispersion for the timing of the return of estrus in early postpartum Japanese Black cows.

収録刊行物

  • 日本獣医師会雑誌 = Journal of the Japan Veterinary Medical Association

    日本獣医師会雑誌 = Journal of the Japan Veterinary Medical Association 64(11), 870-873, 2011-11-20

    日本獸医師会

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各種コード

  • NII論文ID(NAID)
    10030288442
  • NII書誌ID(NCID)
    AN00191857
  • 本文言語コード
    JPN
  • 資料種別
    SHO
  • ISSN
    04466454
  • NDL 記事登録ID
    023332561
  • NDL 請求記号
    Z18-352
  • データ提供元
    CJP書誌  NDL  IR  J-STAGE 
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