摘要
Intake, digestibility of nutrients, daily weight gain, and feed conversion were evaluated in beef cattle receiving diets containing the following ratios of sorghum silage:Tifton 85 haylage: 0:100; 32:68; 66:34; and 100:0. Diets were formulated to be isonitrogenous (12% crude protein) with a forage:concentrate ratio of 60:40, on DM basis. Twenty-four crossbred Holstein x Zebu steers averaging 360 kg of initial body weight were distributed in a completely randomized block design with 15 days for diet adaptation followed by three experimental periods of 28 days each. Indigestible acid detergent fiber (IADF) was used to estimate fecal output. Mean daily intakes of DM, OM, CP, EE, TC, and TDN all were not affected by treatments with mean values of: 9.46, 9.05, 1.20, 0.52, 7.4, and 6.23 kg/day, respectively. Significant quadratic effects were observed for the apparent total tract digestibilities of DM, OM, CP, and EE with estimated minimum digestibilities of 60.33, 61.58, 61.89, and 55.83% for the levels of 44.80, 47.18, 50.95, and 51.21% of sorghum silage in the forage portion of the diet, respectively. Mean daily weight gain and feed conversion also were affected quadratically by increasing the level of sorghum silage in the forage portion of the diet with estimated maximum and minimum values of 1.25 kg/day and 7.66 for the levels of 60.95 and 67.04% of sorghum silage, respectively. Results indicated that varying dietary ratios of Tifton 85 haylage and sorghum silage is a good alternative for feeding forage to finishing beef cattle. Inclusion of approximately 60% of sorghum silage in the total dietary forage resulted in the greatest estimated weight gain.
摘要译文
摄取，营养素，每日体重增加和饲料转化率的消化率接收包含高粱青贮下述比例的饮食肉牛进行了评价：蒂夫顿85 haylage：0：100;32:68; 66:34;和100：0。日粮配方为等氮（12％粗蛋白）与草料：60:40精矿比例，对DM的基础。为nx瘤牛阉牛平均360千克初始体重分布在一个完全随机区组设计，对饮食适应随后的每个28天三个实验周期15天。不消化酸性洗涤纤维（IADF）被用来估计粪便输出。意思是DM，OM，CP，EE，TC，和TDN的每日摄入量都没有受到以平均值处理：9.46，9.05，1.20，0.52，7.4，6.23 kg /天，分别。观察为DM，OM，CP，和EE与60的估计的最小消化率的表观总肠道消化率显著二次效果。33，61.58，61.89，和对于高粱青贮44.80，47.18，50.95，和51.21％，在饮食的饲料部的水平55.83％之间。平均日体重增加和饲料转化率也被二次受增加饮食中与估计的最大和1的最小值的饲草部高粱青贮的水平。25公斤/日和7.66为60.95的水平和高粱青贮67.04％之间。结果表明，不同的蒂夫顿85 haylage和高粱青贮饲料的比例是喂饲料整理肉牛一个很好的选择。在总膳食牧草青贮高粱的约60％包含导致最大推定体重增加。