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Short communication: Effects of dietary addition of N-carbamylglutamate on milk composition in mid-lactating dairy cows
Journal of Dairy Science ( IF 3.5 ) Pub Date : 2018-09-27 , DOI: 10.3168/jds.2018-15162
F.F. Gu , S.L. Liang , Z.H. Wei , C.P. Wang , H.Y. Liu , J.X. Liu , D.M. Wang

The present study was conducted to investigate the effect of N-carbamylglutamate (NCG) on milk production and composition in mid-lactating Holstein dairy cows. Sixty multiparous cows with a mean body weight of 669 kg (standard deviation = 71) and 176 days in milk (standard deviation = 55) were blocked based on parity and milk production and randomly assigned into 4 treatments, a basal diet supplemented with 0, 10, 20, or 40 g of NCG/d per cow. Milk yield and composition were recorded weekly, whereas dry matter intake and plasma variables were determined every 2 wk. The results showed that the addition of NCG had no effect on the dry matter intake and milk yield of the cows. Milk fat content and yield increased linearly with NCG addition. The contents of milk protein and total solid also increased linearly in the cows fed NCG, whereas the yield of protein was not affected by the treatments. Conversely, dietary addition of NCG increased the plasma nitric oxide content in a quadratic manner. Moreover, addition of NCG linearly increased the plasma Arg content. Overall, the results indicate that dietary NCG addition increased the milk protein and fat contents, which improved the milk quality of lactating dairy cows.



中文翻译:

简短交流:饮食中添加N-氨基甲酰谷氨酸对泌乳中期奶牛乳成分的影响

进行本研究以研究的影响-氨基甲酸酯谷氨酸盐(NCG)对泌乳中期的荷斯坦奶牛的产奶量和组成的影响。根据胎次和产奶量,对60头平均体重为669千克(标准差= 71),乳汁为176天(标准差= 55)的多头母牛进行了封锁,并随机分配到4种处理方法中,即基础饮食中添加了0,每头母牛10、20或40克NCG / d。每周记录一次牛奶产量和组成,而每2周确定一次干物质摄入量和血浆变量。结果表明,添加NCG对奶牛的干物质摄入量和产奶量没有影响。牛奶脂肪含量和产量随添加NCG呈线性增加。饲喂NCG的奶牛的牛奶蛋白质和总固体含量也呈线性增加,而蛋白质的产量不受处理的影响。反过来,日粮中添加NCG以二次方增加血浆一氧化氮含量。此外,添加NCG线性增加了血浆Arg含量。总体而言,结果表明日粮NCG的添加增加了乳蛋白和脂肪含量,从而提高了泌乳奶牛的乳品质。

更新日期:2018-09-27
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