論文

査読有り
2016年

Effects of parity and season on pregnancy rates after the transfer of embryos to repeat-breeder Japanese Black beef cattle

ARCHIVES ANIMAL BREEDING
  • T. Ono
  • ,
  • T. Isobe
  • ,
  • Y. Morita
  • ,
  • L. T. K. Do
  • ,
  • F. Tanihara
  • ,
  • M. Taniguchi
  • ,
  • M. Takagi
  • ,
  • T. Otoi

59
1
開始ページ
45
終了ページ
49
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.5194/aab-59-45-2016
出版者・発行元
ARCHIV FUR TIERZUCHT

Repeat-breeder (RB) cows are a major source of economic waste due to their decreased fertility. Embryo transfer (ET) is an alternative tool to improve the fertility of RB cows. The aims of the present study were to evaluate the effects of recipient parity and the season on pregnancy rates following ET in RB Japanese Black beef cattle. Embryos were transferred nonsurgically to recipients, consisting of 155 heifers (< 2 years old) and 172 cows (< 8 years old), which were defined as RB cattle. Of the recipients that were presented for ET, 57 recipients received a fresh embryo and 270 recipients received a frozen embryo. There were no differences in the pregnancy rates between cattle that received fresh embryos or frozen embryos. The rates of recipients with pregnancy, abortion, stillbirth, and normal calving were similar between heifers and cows. In cows, the pregnancy rates were lower (P < 0.05) in summer (June to August) than in spring (March to May) and winter (December to February). In heifers, however, there were no differences in the pregnancy rates among the seasons. Our findings indicate that in RB Japanese Black beef cattle, the parity of the recipients does not have an effect on the pregnancy rates following the transfer of fresh and frozen embryos. However, heat stress may affect reproductive performance in RB Japanese Black cows.

Web of Science ® 被引用回数 : 3

リンク情報
DOI
https://doi.org/10.5194/aab-59-45-2016
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000383418300006&DestApp=WOS_CPL

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