The objective was to evaluate the partial substitution of sugarcane treated with urea by elephant grass in the feeding of crossbred cows in lactation. Eight crossbred cows (Holstein x Gyr) were used, with 474 kg of body weight (standard deviation = 46.15 kg) and 8.15 kg of milk per day. The animals were housed in individual stalls, distributed in two 4 x 4 Latin squares, and the treatments were: sugar cane; sugar cane corrected with 0.5% of urea and ammonium sulfate (9:1); 75% of sugar cane + 25% of elephant grass and 50% of sugarcane + 50% of elephant grass, based on natural matter. In addition to the treatments, it was provided water and mineral salt ad libitum and 3 kg of concentrate supplement (24% crude protein), based on corn meal and soybean meal, supplied in two portions during the morning and afternoon milking. There was a treatment effect on the intake and digestibility of dry matter and nutrients, except for non-fibrous carbohydrate intake, and there was no effect on milk production and composition. It can be concluded that the substitution of sugarcane by elephantgrass (25 and 50%) increases the intake and decreases the digestibility of DM and OM, without affecting milk production, when the cows are supplemented with 3 kg of concentrate, containing 24% of protein per day.
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机译:目的是评估大象草在哺乳期杂交奶牛喂养中用尿素治疗的甘蔗部分取代。使用8个杂交奶牛(Holstein X Gyr),每次474千克体重(标准差= 46.15千克)和8.15千克牛奶。这些动物被安置在单个摊位中,分布在两个4 x 4拉丁方块中,治疗是:甘蔗;甘蔗矫正0.5%的尿素和硫酸铵(9:1); 75%的甘蔗+ 25%的大象草和50%的甘蔗+ 50%的大象草,基于自然物质。除了治疗外,还提供了水和矿物盐,基于玉米粉和大豆膳食的3千克浓缩物补充(24%粗蛋白),在早晨和下午挤奶中供应。除了非纤维状碳水化合物摄入外,还存在对干物质和营养素的摄入和消化率的治疗效果,并且对牛奶生产和组成没有影响。可以得出结论,当奶牛补充3千克浓缩物,含有3千克浓缩物,含有3千克浓缩物,含有3千克浓缩物,含牛奶的甘蔗(25和50%)通过摄入量增加(25和50%)增加,并降低了DM和OM的消化率,而不会影响牛奶生产,含有3千克浓缩物,含有24%的蛋白质每天。
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