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首页> 外文期刊>Tropical Animal Health and Production >Supplementation of suckling beef calves with different levels of crude protein on tropical pasture
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Supplementation of suckling beef calves with different levels of crude protein on tropical pasture

机译：在热带牧场上补充不同蛋白含量的乳牛犊

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The effects of supplementation with different levels of crude protein on performance, intake and nutrient digestibility and efficiency of microbial protein synthesis in suckling beef calves on pasture were assessed. Fifty-five calves, with an average age of 100 days and an initial average body weight of 110 +/- 7.5 kg and their respective dams, were used. The experimental design was completely randomised with five treatments and 11 replications. The experimental treatments for calves were as follows: control = calves received only mineral mixture; supplementation levels = calves received supplement containing 8, 19, 30 or 41 % of crude protein (CP, at a rate of 0.5 % of body weight (BW)). The cows received only mineral mixture ad libitum. Supplemented calves had higher (P < 0.1) average daily gain (ADG). Protein levels showed a quadratic effect (P < 0.1) on average daily gain (ADG) of calves. There was no difference in total dry matter (DM) intake (P > 0.1). However, intake of dry matter forage (DMF) presented cubic profiles (P < 0.1), with CP levels in the supplements. Supplementation increased (P < 0.1) the digestibility of nutrients, except for the digestibility of neutral detergent fibre. Supplementation increased (P < 0.1) the production of microbial nitrogen and N losses in urine. It can be concluded that multiple supplementations optimise the performance of beef calves on creep feeding. The intake of supplements with CP levels between 8 and 30 % partially replaces of the pasture ingested by calves and increases the digestibility of the diet.
机译：评估了不同水平的粗蛋白补充对牧场乳牛犊生产性能，摄入量和养分消化率以及微生物蛋白合成效率的影响。使用平均年龄为100天，初始平均体重为110 +/- 7.5千克的五十五头犊牛及其相应的坝。实验设计通过5种治疗和11次重复完全随机化。犊牛的实验处理如下：对照=犊牛只接受矿物质混合物;补充水平=犊牛接受的粗蛋白含量为8、19、30或41％（CP，以体重（BW）的0.5％）补充。母牛只随意接受矿物质混合物。补充犊牛的平均日增重（ADG）更高（P <0.1）。蛋白质水平对犊牛的平均日增重（ADG）表现出二次效应（P <0.1）。总干物质摄入量没有差异（P> 0.1）。然而，干饲料（DMF）的摄入量呈立方分布（P <0.1），补充剂中的CP含量较高。除中性洗涤剂纤维的消化率外，补充剂提高了营养物的消化率（P <0.1）。补充增加（P <0.1）尿中微生物氮和氮的损失。可以得出结论，多种补充可以优化牛犊在creep饲时的性能。 CP含量在8％至30％之间的补充剂的摄入部分替代了犊牛摄入的牧场，并增加了饮食的消化率。

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