Institute of Animal and Dairy Sciences, University of Agriculture, Faisalabad, Pakistan.
Trop Anim Health Prod. 2021 Apr 28;53(2):290. doi: 10.1007/s11250-021-02666-7.
The objective was to determine the growth performance of Friesian calves given milk or milk replacer (MR) at varying levels. Forty-eight male Friesian calves were divided into four groups of 12 animals each. Calves were offered either milk or MR at either 10 or 15% of body weight (BW), with upper limits of 5 and 6 L/d, respectively until week 8. The calves were weaned at 10 weeks of age by gradually reducing the offered liquid to zero. In addition, from the second week, calves were offered calf starter ration (CS) until each calf reached 120 kg. The calves raised on milk had better growth rates (610 ± 25 vs. 487 ± 25 g/d; P < 0.05), displayed higher weaning weights (71 ± 1.5 vs. 55.9 ± 1.5 kg; P < 0.05) and reached the target weight of 120 kg earlier (20.9 ± 0.8 vs. 24.1 ± 0.8 weeks; P < 0.05) than those on MR. However, growth rate was not affected (535 ± 25 vs. 568 ± 25; P > 0.05) by liquid feeding level. Cost per kg live weight gain was not affected (325 ± 8 vs. 319 ± 8; P < 0.05) by feeding source or feeding levels (317 ± 8 vs. 328 ± 8). Thus, feeding milk at 10% of body weight saves time and labour required to achieve target weight in veal calves.
目的是确定不同水平下给予弗里斯兰犊牛牛奶或代乳粉（MR）的生长性能。将 48 头雄性弗里斯兰犊牛分为 4 组，每组 12 头。犊牛分别接受 10%或 15%体重的牛奶或 MR，上限分别为 5 和 6 L/d，直到第 8 周。10 周龄时通过逐渐减少提供的液体量至零来断奶。此外，从第二周开始，向犊牛提供犊牛开食料（CS），直到每头犊牛达到 120kg。用牛奶饲养的犊牛生长速度更快（610 ± 25 比 487 ± 25 g/d；P < 0.05），断奶体重更高（71 ± 1.5 比 55.9 ± 1.5 kg；P < 0.05），达到 120kg 目标体重的时间更早（20.9 ± 0.8 比 24.1 ± 0.8 周；P < 0.05），而 MR 组则没有影响（535 ± 25 比 568 ± 25；P > 0.05）。每公斤活体重增重的成本不受喂养来源或喂养水平的影响（325 ± 8 比 319 ± 8；P < 0.05）。因此，以 10%体重给犊牛喂牛奶可以节省达到小牛肉目标体重所需的时间和劳动力。
