Performance of Gir young bull maintained in "Brachiaria brizantha" pastures submitted to different management

This research aimed to evaluate the effect of protein and energy supplementation and different herbage allowances (OF) during the rainy season, on the weight gain of Gir young bulls grazing Brachiaria brizantha maintained in a rotational grazing system. Evaluated forage allowance and chemical composition of Brachiaria brizanthapasture. We used 24 Gir young bulls with an average weight of 223kg, distributed in a randomized block design in a split plot scheme, treatments was distributed in plots, and periods in subplots, with six replications. Treatments were not supplemented (SS) young bull grazing in pasture with 4.0% of forage allowance (SS + 4% FA); supplementation with 0.5% body weight (SO) and 4.0% of FA (SO + 4.0 % FA); supplementation with 0.5% body weight and 3.5% FA (SO + 3.5% FA) and supplementation with 0.5% body weight and 4.5% FA (SO + 4.5% FA). During the rainy season, the young bulls weight gain increased (P 0.05).本研究旨在评估雨季期间，蛋白质与能量补充方案及不同饲草供给量（forage allowance, 缩写OF）对轮牧系统中种植的布氏臂形草（Brachiaria brizantha）牧场上放牧的吉尔青年公牛（Gir young bulls）增重效果的影响，并测定了该布氏臂形草牧场的饲草供给量与牧草化学成分。本试验选用24头平均初始体重为223kg的吉尔青年公牛，采用裂区随机区组设计，将试验处理分配至主区，放牧周期分配至副区，共设置6次重复。试验处理如下：未补充营养组（SS），即在饲草供给量（forage allowance, 缩写FA）为4.0%的牧场放牧（SS + 4% FA）；按体重0.5%进行营养补充组（SO），搭配4.0%饲草供给量（SO + 4.0% FA）；按体重0.5%进行营养补充组，搭配3.5%饲草供给量（SO + 3.5% FA）；以及按体重0.5%进行营养补充组，搭配4.5%饲草供给量（SO + 4.5% FA）。雨季放牧期间，青年公牛的增重效果提升（P=0.05）。