摘要
Pearl millet grain was blended with corn in 1:1 or 2:1 ratios in beef finishing diets fed in two metabolism and two feedlot trials. In Exp. 1, diets contained 1) 79.5% corn and 4.5% soybean meal (C-SBM), 2) 28% corn, 54.5% sorghum, and 1.5% soybean meal [GSC(2:1)], and 3) 28% corn and 56% pearl millet [PMC(2:1)]. In Exp. 2, diets contained 1) 81.5% corn and 3.5% soybean meal (C-SBM) or 2) 42.5% corn and 42.5% pearl millet [PMC(1:1)]. Diets fed to steers in metabolism trials in Exp. 1 and 2 had similar (P > .10) apparent digestion coefficients for OM, crude fiber, NDF, and ADF. However, ether extract digestibility was higher (P < .05) for C-SBM than for GSC(2:1) and PMC(2:1) in Exp. 1, and it was higher (P < .10) for C-SBM than for PMC(1:1) in Exp. 2. In both experiments CP digestibility was higher (P < .10) for C-SBM diets, and N retention was similar (P > .10) for diets within each experiment. In each experiment, TDN calculated from apparent digestion coefficients was converted to NEm and NEg. The TDN, NEm, and NEg were lower (P < .10) for GSC(2:1) and PMC(2:1) than for C-SBM in Exp. 1. Experimental diets were fed to steers (n = 45; 396 ± 19 kg initial BW; 70-d ad libitum feeding) in Exp. 1 and to heifers (n = 30; 318 ± 15 kg initial BW; 92-d ad libitum feeding) in Exp. 2. The ADG, empty body weight gain (EBG), and predicted EBG were not different (P > .10) for diets composed of the different grain sources. Feed DMI and DM per gain were higher (P < .05) for PMC(1:1) than for C-SBM in Exp. 2. Pearl millet supplied approximately 88% as much NEm and 85% as much NEg as the corn-SBM portion of diets having similar CP concentrations.
摘要译文
在两个代谢和两个饲养场试验中喂养的牛肉精加工日粮中，珍珠粟粒与玉米以1：1或2：1的比例混合。在Exp。 1，饮食中含有1）79.5％的玉米和4。5％大豆粉（C-SBM），2）28％玉米，54.5％高粱和1.5％豆粕[GSC（2：1）]，和3）28％玉米和56％珍珠粟[PMC 1）]。在Exp。 2，日粮含1）玉米81.5％和3。5％豆粕（C-SBM）或2）42.5％玉米和42.5％珍珠粟[PMC（1：1）]。在Exp中进行代谢试验的饲料喂养。对于OM，1和2具有相似的（P .10）表观消化系数，粗纤维，NDF和ADF。然而，对于C-SBM，醚提取物的消化率高于对于GSC（2：1）和PMC（2：1）的消化率。 1，对于C-SBM而言，其比Exp中的PMC（1：1）高（P .10）。2.在这两个实验中，C-SBM日粮的CP消化率较高（P .10），而在每个实验中日粮的N保留值相似（P 0.10）。在每个实验中，由表观消化系数计算的TDN被转换为NE m和NE g。 GSC（2：1）和PMC（2：1）的TDN，NE m和NE g比Exp中的C-SBM低（P .10）。 1。将实验饮食喂入Exp中的转向（n \x3d 45; 396±19kg初始BW;随意喂食70天）。 1和小母牛（n \x3d 30; 318±15kg初始体重; 92天随意喂养） 2.助理总干事，空腹体重增加（EBG）和预测的EBG对于由不同谷物来源构成的日粮没有不同（P 0.10）。饲料DMI和DM每增加更高（P 。05）对于PMC（1：1）而不是对于C-SBM的Exp。 2.珍珠粟与具有相似CP浓度的日粮中的玉米-SBM部分相比提供了大约88％的NEm和85％的NEg。
G. M. Hill;G. L. Newton;M. N. Streeter;W. W. Hanna;P. R. Utley;M. J. Mathis. Digestibility and utilization of pearl millet diets fed to finishing beef cattle[J]. Journal of Animal Science, 1996,74(7): 1728–1735