Papers

Peer-reviewed
2012

Effect of estrus synchronization treatment after luteolysis on Holstein heifers as embryo transfer recipients

ANIMAL SCIENCE JOURNAL
  • Tatsuyuki Yoshida
  • ,
  • Taro Sato
  • ,
  • Koji Chiba
  • ,
  • Itaru Yoshimura
  • ,
  • Masahiro Osada
  • ,
  • Konosuke Okada
  • ,
  • Hiroki Furuta
  • ,
  • Akihiko Ohta
  • ,
  • Hitoshi Ushijima

Volume
83
Number
7
First page
529
Last page
534
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1111/j.1740-0929.2011.00994.x
Publisher
WILEY-BLACKWELL

This study was designed to evaluate the effect of estrus synchronization treatments on recipient heifers for embryo transfer (ET). Holstein heifers were separated into the following three groups: (i) an administration of 50 mu g GnRH (gonadotropin-releasing hormone) analog was given to heifers at a random stage of the estrus cycle, followed 7 days later by two administrations of 7.5 mg prostaglandin F2 alfa analog (PG) as control; (ii) another administration of 100 mu g GnRH was given to the control group at 48 h after the administration of PG as the second GnRH group; and (iii) an administration of 0.75 mg estradiol benzoate (E2) was given to the control group at 24 h after the administration of PG as the E2 group. Each method caused estrus synchronization. Fresh embryos were nonsurgically transferred into the suitable recipients that had a functional corpora lutea (CL) 7 days after estrus. The E2 group showed a significantly higher (P < 0.01) rate of estrus synchronization (98.9%) at 13 days after PG administration and the final pregnancy rate of the E2 group (50.6%) was also significantly higher than the other groups (37.1%, P < 0.05 and 30.9%, P < 0.01, respectively). These findings demonstrate that E2 administration 24 h after PG protocol is effective for estrus synchronization of Holstein heifers, thus improving the productivity of ET.

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Link information
DOI
https://doi.org/10.1111/j.1740-0929.2011.00994.x
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000306220200002&DestApp=WOS_CPL

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