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首页> 外文期刊>Archivos Latinoamericanos de Produccion Animal >Milk yield and composition, and feed efficiency in Jersey cows supplemented with fat sources
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Milk yield and composition, and feed efficiency in Jersey cows supplemented with fat sources

机译：补充脂肪来源的泽西奶牛的牛奶产量和组成以及饲料效率

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Eight Jersey cows in early lactation, of 380 kg mean liveweight, were used to evaluate the effects of several lipid supplements on milk yield and composition and feed efficiency. The cows were distributed in a replicated 4 x 4 Latin square design, with 21-day experimental periods, and fed isocaloric diets of corn silage and alfalfa hay and one of four concentrates: control (without lipid supplement) and three including different lipid sources: tallow, protected fact and ground whole soybeans. Milk yield was recorded daily and on the 19th and 21st day of each experimental period samples of milk were collected for determination of chemical composition. The data were submitted to analysis of variance and means were compared by Tukey test. The diet with protected fat increased (P<0.05) 4% fat-corrected-milk (FCM) yield and improved feed efficiency in relation to the control. The different lipid sources did not influence (P< 0.005) the concentration or production of fat, protein and lactose, nor the concentration of urea, total solids, calcium, ash and energy of the milk.
机译：使用八头泽西奶牛在泌乳初期，平均活重380公斤，来评估几种脂质补充剂对牛奶产量，组成和饲料效率的影响。奶牛采用重复的4 x 4拉丁方形设计进行分配，实验期为21天，用玉米，青贮饲料和苜蓿干草等热量饮食和四种浓缩物中的一种进行饲喂：对照组（不添加脂质）和三种包括不同脂质来源：牛脂，保护事实，并磨碎整个大豆。每天记录牛奶产量，并在每个实验期的第19和21天收集牛奶样品以测定化学成分。将数据提交给方差分析，并通过Tukey检验比较均值。与对照相比，受保护脂肪的日粮增加了（P <0.05）4％的脂肪校正奶（FCM）产量，并提高了饲料效率。不同的脂质来源不影响（P <0.005）脂肪，蛋白质和乳糖的浓度或产生，也不影响尿素，总固体，钙，灰分和牛奶能量的浓度。

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