PDF(Pubmed)
Abstract：
The objective of this study was to evaluate the effect of different nutritional strategies on the intensification of beef cattle farming on pastures during the dry period of the year. Eighty male cattle (testers) were randomly allocated to 16 paddocks formed with Mombaça grass (Megathyrsus maximus), totaling five animals (testers) per paddock. The strategies consisted of two LCs [10 and 16.7 g·kg-1 body weight (BW)] and two PSs with DDGS and SBM in a completely randomized design with a 2 × 2 factorial arrangement. The chemical, structural, and productive characteristics of the forage were evaluated, as well as the performance, productivity, and serum parameters of the supplemented animals. The forage presented a greater L:C (p = 0.033) and CP content (p = 0.007) when the lowest LC was used. Animals that received the highest LC had the highest supplement intake (p < 0.001) and the lowest pasture intake (p < 0.001). The nutritional strategy with an LC of 16.7 g·kg-1 of body weight (BW) resulted in a greater increase in total BW, i.e., 200 kg·BW ha-1 more. Therefore, higher levels of concentrate ensure greater productivity for beef cattle grazing, and DDGS can replace SBM in supplements used in the intensive raising of beef cattle on pasture without compromising the performance and productivity of the animals.
摘要：
这项研究的目的是评估不同营养策略对一年中干旱期间牧场肉牛养殖集约化的影响。将80头雄性牛（测试人员）随机分配到由Mombaça草（Megathyrsusmaximus）形成的16个围场中，每个围场共有五只动物(测试人员)。策略包括两个LC[10和16.7g·kg-1体重（BW）]和两个带有DDGS和SBM的PS，采用2×2阶乘排列的完全随机设计。化学,结构,并对牧草的生产特性进行了评估，以及表演，生产力,和补充动物的血清参数。当使用最低LC时，牧草的L：C（p=0.033）和CP含量（p=0.007）更高。接受最高LC的动物具有最高的补充剂摄入量(p<0.001)和最低的牧场摄入量(p<0.001)。LC为16.7g·kg-1体重（BW）的营养策略导致总BW增加更大，即，200kg·BWha-1更多。因此,较高的浓缩物水平确保肉牛放牧的更高生产力，和DDGS可以代替SBM在牧场上密集饲养肉牛的补充剂中使用，而不会损害动物的性能和生产力。
