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Effect of suckling period on calf growth and milk yield of Zebu cows

机译：哺乳期对瘤牛奶牛生长和产奶量的影响

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Eighteen multiparous Zebu cows in their third lactation and their calves were randomly allocated to three suckling periods, up to 3, 4 or 5 months of age of the calf. The cows were individually fed natural hay, cottonseed cake and molasses. At 2 months of age, all calves were separated from their mothers, and were offered cottonseed cake mixed with molasses and Mucuna hay individually. The calves stimulated milk ejection by suckling 30 seconds and suckled the residual milk for 45 minutes after milking. The dry matter intake of cows (3.68, 3.29 and 3.31% of body weight) and calves (2.88, 2.80 and 2.55% of body weight) for suckling up 3, 4 and 5 months of age, respectively, was not significantly affected by treatment and neither was the growth rate of the calves (178, 157 and 149 g/d for 3, 4 or 5 months suckling period, respectively). Cows suckling their calves up to 5 months had significantly higher milk yield and higher amount of saleable milk (1.97, 2.93 and 3.69 kg/cow/d for 3, 4 and 5 months suckling period, respectively). The fat content of the milk decreased with increasing length of the suckling period while the protein content was not affected. In conclusion, a suckling period of 5 months resulted in higher total milk production and higher amount of saleable milk but did not seem to have any effect on calf growth when the calves were supplemented.
机译：在第三次哺乳期间，将十八头杂种杂布牛和小牛随机分配到三个小乳期，小至三，四个或五个月大。分别给母牛喂天然干草，棉籽饼和糖蜜。在2个月大时，将所有犊牛与母亲分开，分别提供棉籽饼，糖蜜和Mucuna干草。小牛通过挤奶30秒来刺激乳汁排出，并在挤奶后将残留的乳汁哺乳45分钟。哺乳期分别为3、4和5个月的母牛（分别为体重的3.68％，3.29％和3.31％）和犊牛（分别为体重的2.88％，2.80％和2.55％）的干物质摄入量并未受到治疗的显着影响。小牛的生长速度（哺乳期3、4或5个月分别为178、157和149 g / d）也没有。哺乳至5个月的奶牛的产奶量和可售乳量明显更高（哺乳期3、4和5个月分别为1.97、2.93和3.69 kg /牛/天）。牛奶中的脂肪含量随着哺乳期的延长而降低，而蛋白质含量不受影响。总之，哺乳期为5个月可导致更高的总产奶量和可售牛奶量，但补充小牛似乎对小牛的生长没有任何影响。

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