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Effects of use of conventional and sexed semen on the conception rate in heifers: A comparison study.
Theriogenology 2019; 135:33-37T

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 AI 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 AI with conventional semen (P < 0.01). Our results showed that more careful implementation of AI is required for a stable conception using sexed semen, particularly during warmer months.

Authors+Show Affiliations

Laboratory of Animal Genetics and Reproduction, Research Faculty of Agriculture, Hokkaido University, Kita-ku Kita 9 Nishi 9, Sapporo, 060-8589, Japan.Dairy Cattle Group, Division of Dairy Production Research, Hokkaido Agriculture Research Centre, NARO, Sapporo, 062-8555, Japan.Computing Section, Milk Recording Division, Hokkaido Dairy Milk Recording and Testing Association, Sapporo, 060-0004, Japan.Computing Section, Milk Recording Division, Hokkaido Dairy Milk Recording and Testing Association, Sapporo, 060-0004, Japan.Laboratory of Animal Genetics and Reproduction, Research Faculty of Agriculture, Hokkaido University, Kita-ku Kita 9 Nishi 9, Sapporo, 060-8589, Japan.Laboratory of Animal Genetics and Reproduction, Research Faculty of Agriculture, Hokkaido University, Kita-ku Kita 9 Nishi 9, Sapporo, 060-8589, Japan.Laboratory of Animal Genetics and Reproduction, Research Faculty of Agriculture, Hokkaido University, Kita-ku Kita 9 Nishi 9, Sapporo, 060-8589, Japan. Electronic address: k-hara@anim.agr.hokudai.ac.jp.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31195359

Citation

Oikawa, Kohei, et al. "Effects of Use of Conventional and Sexed Semen On the Conception Rate in Heifers: a Comparison Study." Theriogenology, vol. 135, 2019, pp. 33-37.
Oikawa K, Yamazaki T, Yamaguchi S, et al. Effects of use of conventional and sexed semen on the conception rate in heifers: A comparison study. Theriogenology. 2019;135:33-37.
Oikawa, K., Yamazaki, T., Yamaguchi, S., Abe, H., Bai, H., Takahashi, M., & Kawahara, M. (2019). Effects of use of conventional and sexed semen on the conception rate in heifers: A comparison study. Theriogenology, 135, pp. 33-37. doi:10.1016/j.theriogenology.2019.06.012.
Oikawa K, et al. Effects of Use of Conventional and Sexed Semen On the Conception Rate in Heifers: a Comparison Study. Theriogenology. 2019 Sep 1;135:33-37. PubMed PMID: 31195359.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of use of conventional and sexed semen on the conception rate in heifers: A comparison study. AU - Oikawa,Kohei, AU - Yamazaki,Takeshi, AU - Yamaguchi,Satoshi, AU - Abe,Hayato, AU - Bai,Hanako, AU - Takahashi,Masashi, AU - Kawahara,Manabu, Y1 - 2019/06/06/ PY - 2019/01/24/received PY - 2019/05/20/revised PY - 2019/06/06/accepted PY - 2019/6/14/pubmed PY - 2019/6/14/medline PY - 2019/6/14/entrez KW - Artificial insemination KW - Conception rate KW - Heat stress KW - Holstein heifer KW - Sexed semen SP - 33 EP - 37 JF - Theriogenology JO - Theriogenology VL - 135 N2 - 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 AI 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 AI with conventional semen (P < 0.01). Our results showed that more careful implementation of AI is required for a stable conception using sexed semen, particularly during warmer months. SN - 1879-3231 UR - https://www.unboundmedicine.com/medline/citation/31195359/Effects_of_use_of_conventional_and_sexed_semen_on_the_conception_rate_in_heifers:_A_comparison_study L2 - https://linkinghub.elsevier.com/retrieve/pii/S0093-691X(19)30233-X DB - PRIME DP - Unbound Medicine ER -