Masaka Lawrence, Mhaka Victor, Sungirai Marvelous, Nyamukanza Casper
Department of Livestock and Wildlife Management, Midlands State University, P. Bag 9055, Gweru, Zimbabwe,
Trop Anim Health Prod. 2015 Aug;47(6):1055-9. doi: 10.1007/s11250-015-0827-2. Epub 2015 Apr 17.
An experiment was conducted to determine the optimum inclusion levels of dried broiler litter (DBL) as a substitute for cottonseed cake (CSC) in fattening diets for Brangus steers. Thirty Brangus steers were randomly allocated to five groups of six animals each. Each group was fed one of the experimental diets which had CSC substituted for DBL at levels of 0 (DBL0), 50 (DBL50), 100 (DBL100), 150 (DBL150) and 200 g/kg (DBL200). Average daily gain (ADG), dry matter intake and live weight gain (LWG) were measured over a period of 90 days, and the results were analysed using the MIXED procedures of SAS. Linear and quadratic effects of DBL inclusion on dry matter intake, LWG and ADG were also determined. Results showed interactions between diet and time that significantly affected ADG and LWG (p < 0.05). Both ADG and LWG decreased with increases in DBL inclusion with the depressed performance becoming more pronounced with time. Linear and non-linear decreases in LWG and ADG, respectively, were observed with increasing levels of DBL. The DBL50 diet resulted in performance that was similar to DBL50 and was 4% cheaper. Broiler litter can be used as a supplement for conventional protein sources, but at higher inclusion levels, it needs to be augmented by increased fermentable energy.
进行了一项实验，以确定在婆罗门牛育肥日粮中用干肉鸡粪便（DBL）替代棉籽饼（CSC）的最佳添加水平。30头婆罗门牛被随机分为5组，每组6头。每组饲喂一种实验日粮，其中CSC被DBL以0（DBL0）、50（DBL50）、100（DBL100）、150（DBL150）和200 g/kg（DBL200）的水平替代。在90天的时间内测量平均日增重（ADG）、干物质摄入量和体重增加（LWG），并使用SAS的MIXED程序分析结果。还确定了DBL添加量对干物质摄入量、LWG和ADG的线性和二次效应。结果表明，日粮和时间之间的相互作用显著影响ADG和LWG（p < 0.05）。随着DBL添加量的增加，ADG和LWG均下降，且随着时间的推移，性能下降变得更加明显。随着DBL水平的增加，分别观察到LWG和ADG呈线性和非线性下降。DBL50日粮的性能与DBL0相似，且成本低4%。肉鸡粪便可作为传统蛋白质来源的补充，但在较高添加水平下，需要通过增加可发酵能量来补充。
