摘要
The objective was to evaluate effects of neutral detergent fibre (NDF) digestibility and level of fresh sugarcane on intake, body fatness, carcass characteristics, and rumen kinetics and fermentation of beef cattle. Forty-eight Nellore young bulls were used in a complete randomized block design with a 2 × 2 factorial arrangement of treatments. Eight rumen-cannulated Nellore steers were used in a replicated 4 × 4 Latin square design. Two sugarcane genotypes divergent for stalk NDF digestibility (NDFD) were used. Experimental diets were formulated with 20 or 40% of sugarcane on a dry matter (DM) basis. High-NDFD genotype associated with the lower level of roughage in the diet promoted greater DM intake, resulting in greater body gain. Sugarcane with high-NDFD increased final body weight, hot carcass weight, and back-fat thickness. Animals receiving the genotype with high NDFD had greater rump-fat thickness only with 40% sugarcane in the diet. Animals receiving the low-NDFD genotype at 20% of the diet had lower NDF passage rate. Rumen pH was greater for diets with greater NDF content. There was greater proportion of butyrate in the rumen of animals receiving diets with greater NDF content. In conclusion, high-NDFD sugarcane increased final body and carcass weight, HCW, and fat thickness. When associated with lower inclusion of roughage in the diet, it can also increase DM intake and body weight gain of beef cattle. KeywordsIntake NDF digestibility Passage rate Rumen bacteria Sugarcane
摘要译文
目的是评估中性洗涤剂纤维（NDF）消化率和新鲜甘蔗水平对摄入量，体脂肪，胴体特性，和瘤胃动物和发酵肉牛。四十八名Nellore年轻公牛被用于一个完整的随机区块设计，具有2×2因子排列的治疗。八个瘤胃插管Nellore转向被用于复制的4×4拉丁方形设计。使用了两种不同于茎NDF消化率的甘蔗基因型（NDFD）。用干物质（DM）为基础，用20％或40％的甘蔗配制实验饮食。与食物中较低水平的高NDFD基因型相关，导致DM摄入量增加，导致更多的身体增益。具有高NDFD的甘蔗增加了最终体重，热胴体重和背脂厚度。接受具有高NDFD的基因型的动物在饮食中仅具有40％的甘蔗，具有更大的臀部脂肪厚度。在20％的饮食中接受低NDFD基因型的动物具有较低的NDF通过率。NDF含量较高的日粮瘤胃pH值较高。在接受NDF含量较高的饮食的动物的瘤胃中，丁酸盐的比例较高。结论是，高NDFD甘蔗提高了最终身体和胴体重，HCW和脂肪厚度。当饮食中含有较少的粗饲料时，还可以增加肉牛的摄入量和体重增加肉牛。关键词NDF消化率通过率瘤胃细菌甘蔗
Dannylo Oliveira Sousa [1] Bruno de Sousa Mesquita [1] Alexandre Vaz Pires [2] Miguel Henrique de Almeida Santana [3] Luis Felipe Prada Silva [1 [4]]. Effects of fibre digestibility and level of roughage on performance and rumen fermentation of finishing beef cattle[J]. Tropical Animal Health and Production, 2017,49(7): 1503-1510