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Effects of use of conventional and sexed semen on the conception rate in heifers : A comparison study

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Title: Effects of use of conventional and sexed semen on the conception rate in heifers : A comparison study
Authors: Oikawa, Kohei Browse this author
Yamazaki, Takeshi Browse this author →KAKEN DB
Yamaguchi, Satoshi Browse this author
Abe, Hayato Browse this author
Bai, Hanako Browse this author →KAKEN DB
Takahashi, Masashi Browse this author →KAKEN DB
Kawahara, Manabu Browse this author →KAKEN DB
Keywords: Artificial insemination
Conception rate
Holstein heifer
Heat stress
Sexed semen
Issue Date: 1-Sep-2019
Publisher: Elsevier
Journal Title: Theriogenology
Volume: 135
Start Page: 33
End Page: 37
Publisher DOI: 10.1016/j.theriogenology.2019.06.012
PMID: 31195359
Abstract: Conception rate with the use of sexed semen is lower than that with the use of conventional semen, posing a major problem in the dairy industry. The aim of this study was to understand the risk factors that affect the conception rate after artificial insemination (AI) with conventional and sexed semen using field data. The records of the first insemination in Holstein heifers with conventional (n = 41,857) and sexed semen (n = 45,465) in Hokkaido, Japan were analyzed. The mean conception rate after Al from 2012 to 2016 was 56.9% with conventional semen and 47.3% with sexed semen. A multivariable logistic regression model including the effects of year, heifer age, time of the year, semen type, service sire, and their interactions was used to evaluate the interaction effect of heifer age and time of the year by semen type on the conception rate. In the analysis using heifer age, we found that heifers inseminated with sexed semen were approximately 21 days younger than those inseminated with conventional semen. Interestingly, in early, warmer months (Jun, Jul, and Aug), the conception rate after AI with sexed semen significantly decreased compared with that after Al with conventional semen (P < 0.01). Our results showed that more careful implementation of Al is required for a stable conception using sexed semen, particularly during warmer months.
Rights: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 川原 学

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