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首页> 外文期刊>Tropical Animal Health and Production >Nellore cows and their calves during the lactation period: performance, intake, milk composition, and total apparent digestibility
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Nellore cows and their calves during the lactation period: performance, intake, milk composition, and total apparent digestibility

机译：泌乳期内洛牛及其犊牛：生产性能，摄入量，乳成分和总表观消化率

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An experiment was conducted to evaluate intake and nutrient digestibility, performance, milk composition, and microbial efficiency of Nellore cows and their calves during lactation. Fifteen Nellore cows were fed corn silage and concentrate (85:15). After calving, calves were kept with their dams for 2 months then separated and housed in individual pens adjacent to their dams. Cows were milked every 15 days over 7 months to estimate milk intake of the calves. During lactation, nutrient intake decreased (P 0.01) for cows, while nutrient digestibility increased (P 0.001). Starting 2 months post-calving, calves were offered concentrate (5 g/kg body weight (BW)) and roughage. An increase in DM digestibility was observed for calves in the third month of age, probably due to an associative effect between milk, concentrate, and roughage, which increased DM digestibility without increasing DM intake. Average daily gain (ADG) of the calves increased (P 0.001) during lactation period. Microbial efficiency (g mCP/kg total digestible nutrients (TDN)) did not change (P > 0.05) in either cows or their calves during lactation period. However, nutrient digestibility decreased for calves during this period. Nellore cows produced milk with average of 4.58 % lactose, 5.61 % fat, and with milk protein increasing from 3.6 to 4.0 % as lactation progressed.
机译：进行了一项实验，以评估泌乳期间内洛尔奶牛及其犊牛的摄入量和养分消化率，性能，牛奶成分和微生物效率。向15头内罗尔牛饲喂了玉米青贮饲料和浓缩饲料（85:15）。产犊后，将小牛与它们的水坝保持2个月，然后分开并安置在与水坝相邻的单独的围栏中。在7个月中，每15天给奶牛挤奶一次，以估计犊牛的牛奶摄入量。泌乳期间，奶牛的养分摄入减少（P <0.01），而养分消化率提高（P <0.001）。产犊后两个月开始，向犊牛提供浓缩饲料（5 g / kg体重（BW））和粗饲料。观察到第三个月龄犊牛的DM消化率增加，这可能是由于牛奶，浓缩液和粗饲料之间的关联作用，这增加了DM消化率而没有增加DM摄入量。泌乳期间小牛的平均日增重（ADG）增加（P <0.001）。在泌乳期间，母牛或其犊牛的微生物效率（g mCP / kg总可消化营养素（TDN））没有变化（P> 0.05）。但是，在此期间，犊牛的养分消化率下降。内洛尔奶牛生产的牛奶平均乳糖含量为4.58％，脂肪含量为5.61％，随着泌乳的进行，牛奶蛋白质从3.6％增加到4.0％。

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