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
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
复制标题
饲喂大量代乳粉对日本黑母牛犊繁殖性能以及血液中代谢物和激素浓度的影响
DOI：
10.1111/asj.13505
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发表时间：
2021
影响因子：
2
通讯作者：
Takahashi Hideyuki
中科院分区：
文献类型：
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作者：
Taguchi Yutaka;Inabu Yudai;Hayasaki Koki;Maeda Noriyuki;Kanmera Yoshiro;Yamasaki Seiji;Ota Noboru;Mukawa Kenji;Tsuboi Arisa;Miyamoto Hirokuni;Etoh Tetsuji;Shiotsuka Yuji;Fujino Ryoichi;McMahon Christopher D.;Takahashi Hideyuki
我们评估了饲喂高容量的牛奶添加剂对日本黑小母牛生长和繁殖性能的影响。51头小母牛以9 L/天的剂量饲喂泌乳素，持续60天（9 L × 60天;n= 18）或41天（9 L × 41天;n= 15），或以7 L/天的剂量饲喂泌乳素，持续40天（7 L × 40天;n= 18）。对300日龄时体重≥270 kg、身高≥116 cm的小母牛进行人工授精（AI）。7 L × 40 d组首次AI的日龄比其他组晚0.35个月（P<0.01）。然而，产犊年龄在治疗组之间没有差异（22.1个月）。对于9 L × 60天，从首次AI到妊娠的间隔往往比其他组长约2个月（p= 0.07）。我们的研究结果表明，喂养大量的牛奶添加剂可以通过提高生长速度来降低产犊年龄。此外，我们建议，喂养最多7 L牛奶添加剂40天可能是最合适的饲养制度，因为每个AI的怀孕成功率可能会减少在小牛喂养最多9 L 41和60天。
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.