Goetsch A L, Johnson Z B, Galloway D L, Forster L A, Brake A C, Sun W, Landis K M, Lagasse M L, Hall K L, Jones A L
University of Arkansas, Fayetteville 72701.
J Anim Sci. 1991 Jun;69(6):2634-45. doi: 10.2527/1991.6962634x.
Holstein steer calves (101 to 350 kg BW) consumed bermudagrass hay ad libitum without or with supplemental ground corn up to 1.0% of BW. As BW increased, total DMI increased quadratically (-2.459 + .05448 [BW]-.000073 [BW2] + .540 [corn DMI]; R2 = .83, sy.x = .655). Each kilogram of corn DM decreased bermudagrass DMI by .46 kg. Total digestible OM intake (kg) increased with BW and corn supplementation (.314 + .0127 [BW] + .441 [corn OM intake]; R2 = .79, sy.x = .444). Feed intake level accounted for approximately 2.5 times more variability in total digestible OM intake than digestion did. Corn supplementation decreased digestion of bermudagrass NDF (62.50 - 8.468 [corn DMI, % BW]; R2 = .13, sy.x = 8.121), with a similar decrease across BW. Increasing bermudagrass DMI (% of BW) decreased bermudagrass NDF digestion slightly, but variation accounted for was only 33% of that attributable to corn DMI (% of BW). Concentrations of common fiber fractions (NDF, ADF, cellulose, hemicellulose, and ADL) in bermudagrass explained very little variation in feed intake and digestion, indicating considerable influence of other factors. Bermudagrass intake and digestion were not related, and no substantial interactions were observed among steer BW, corn level, and bermudagrass composition.
荷斯坦阉牛犊牛（体重101至350千克）自由采食百慕大草干草，不添加或添加高达体重1.0%的碎玉米。随着体重增加，总干物质采食量呈二次方增加（-2.459 + 0.05448[体重] - 0.000073[体重²] + 0.540[玉米干物质采食量]；R² = 0.83，标准误 = 0.655）。每千克玉米干物质使百慕大草干物质采食量减少0.46千克。总可消化有机物质摄入量（千克）随体重和玉米添加量增加（0.314 + 0.0127[体重] + 0.441[玉米有机物质摄入量]；R² = 0.79，标准误 = 0.444）。采食量水平在总可消化有机物质摄入量中解释的变异性比消化率多约2.5倍。玉米添加降低了百慕大草中性洗涤纤维的消化率（62.50 - 8.468[玉米干物质采食量，体重%]；R² = 0.13，标准误 = 8.121），体重增加时下降趋势相似。增加百慕大草干物质采食量（体重%）使百慕大草中性洗涤纤维消化率略有下降，但解释的变异仅占玉米干物质采食量（体重%）所致变异的33%。百慕大草中常见纤维组分（中性洗涤纤维、酸性洗涤纤维、纤维素、半纤维素和酸性洗涤木质素）的浓度对采食量和消化率的变异解释很少，表明其他因素影响很大。百慕大草采食量与消化率无关，在阉牛体重、玉米水平和百慕大草组成之间未观察到显著交互作用。
