PMID: 20629219Jul 16, 2010Paper

Factors affecting reproductive performance in high milk-producing Holstein cows

The Journal of Reproduction and Development
Osamu DochiHisaichi Koyama

Abstract

Although the number of dairy farms is decreasing, that of large farms is increasing in Japan. Milk production in Japanese dairy cows has increased from 62 kg/year to 88 kg/year over the last 2 decades. However, Japanese dairy cows are experiencing a sustained decline in reproductive performance, calving intervals, and days open; further, the number of inseminations required for conception have increased, and the conception rate has decreased. In order to improve fertility in high milk-producing dairy cows, it is necessary to evaluate their reproductive characteristics. In this study, the postpartum body condition score (BCS) was remarkably low, and the functional recovery of reproduction was consequently delayed. Moreover, the results indicate that the estrus duration varies among individual cows. However, it is possible to improve the conception rate by inseminating cows 8-12 h after the onset of estrus. Reproductive management systems suitable for the current dairy farming system with large herd sizes are required.

References

Sep 1, 1994·Journal of Dairy Science·J D FergusonN Thomsen
Sep 1, 1996·Journal of Dairy Science·W L WalkerM L McGilliard
Jun 14, 2000·Animal Reproduction Science·W R Butler
Jun 22, 2001·Journal of Dairy Science·M C Lucy
Feb 28, 2002·Journal of Dairy Science·S P WashburnA J McAllister

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Citations

Apr 12, 2011·The Journal of Reproduction and Development·Hisashi NabenishiYasuhiro Tsuzuki
Aug 25, 2015·The Journal of Reproduction and Development·Kazumi KishidaMoriyuki Fukushima
Nov 22, 2015·Animal Reproduction Science·Katsuhisa NagaiMasashi Nagano
Jun 29, 2018·The Journal of Reproduction and Development·Ayano YamadaHiroshi Harayama
Mar 8, 2012·Reproduction, Fertility, and Development·Alexander C O Evans, Siobhan W Walsh
Nov 6, 2018·The Journal of Reproduction and Development·Hisashi NabenishiKazuhiro Suzuki
Jan 22, 2019·The Journal of Reproduction and Development·Kohei UmezuKentaro Tanemura
Dec 21, 2017·Reproductive Medicine and Biology·Hiroshi HarayamaTaichi Noda
Apr 1, 2019·Veterinary World·Evgeny SkovorodinValian Gimranov
May 24, 2016·The Journal of Reproduction and Development·Kohei UmezuKentaro Tanemura
Nov 30, 2019·The Journal of Veterinary Medical Science·Takeshi IshinoHiroshi Kitamura

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