Effects of feeding high volumes of milk replacer on reproductive performance and on concentrations of metabolites and hormones in blood of Japanese black heifer calves

Yutaka Taguchi, Yudai Inabu, Koki Hayasaki, Noriyuki Maeda, Yoshiro Kanmera, Seiji Yamasaki, Noboru Ota, Kenji Mukawa, Arisa Tsuboi, Hirokuni Miyamoto, Tetsuji Etoh, Yuji Shiotsuka, Ryoichi Fujino, Christopher D. McMahon, Hideyuki Takahashi

研究成果: Contribution to journalArticle査読

抄録

We evaluated the effects of feeding high volumes of milk replacer on growth and reproductive performances in Japanese black heifers. Fifty-one heifers were fed milk replacer at 9 L/day for 60 days (9 L × 60 days; n = 18) or 41 days (9 L × 41 days; n = 15), or at 7 L/day for 40 days (7 L × 40 days; n = 18). Artificial insemination (AI) was performed on heifers with ≥270 kg body weight and ≥116 cm body height at 300 days of age. The age at the first AI was 0.35 month later for 7 L × 40 days than the other groups (p < .01). However, age at calving did not differ among treatments (22.1 months). The interval from the first AI to pregnancy tended to be ~2 months longer for the 9 L × 60 days than the other groups (p = .07). Our results showed that feeding high volumes of milk replacer may reduce the age at calving via an improved rate of growth. In addition, we propose that feeding a maximum of 7 L milk replacer for 40 days may be the most appropriate rearing regime because the success of pregnancy per AI may be reduced in calves fed a maximum of 9 L for 41 and 60 days.

本文言語英語
ページ(範囲)e13505
ジャーナルAnimal science journal = Nihon chikusan Gakkaiho
92
1
DOI
出版ステータス出版済み - 1 1 2021

All Science Journal Classification (ASJC) codes

  • 農業および生物科学(全般)

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