West J W, Mandebvu P, Hill G M, Gates R N
University of Georgia, Coastal Plain Station, Tifton 31793-0748, USA.
J Dairy Sci. 1998 Jun;81(6):1599-607. doi: 10.3168/jds.s0022-0302(98)75726-1.
Lactating dairy cows were offered diets containing increasing quantities of Tifton 85 bermudagrass hay or silage and increasing dietary neutral detergent fiber (NDF) to determine effects of method of bermudagrass storage and dietary fiber content on intake, milk yield, and nutrient digestion. Bermudagrass was added as hay or silage at the rate of 8.5, 15.9, or 23.3% of dietary dry matter and was substituted for an equal quantity of corn silage. The method of bermudagrass storage did not affect intake [20.8 vs. 20.3 (+/- 0.3) kg/d for bermudagrass hay and silage diets; respectively], but an increase in the amount of bermudagrass and NDF in the diet did reduce intake. Dietary NDF concentration was well above minimum recommendations of the National Research Council. Milk yield was not altered by method of bermudagrass storage but declined as dietary NDF increased. Digestion of NDF tended to be lower for bermudagrass silage than for bermudagrass hay. An increase in the amount of bermudagrass in the diet improved digestion of dietary dry matter, acid detergent fiber, and NDF; however, milk yield declined because total intake declined. Improved NDF digestion caused by added bermudagrass hay or silage was confirmed by in vitro analyses. High quality bermudagrass hybrids could potentially be used in diets of lactating dairy cows because of the good digestion characteristics and relatively small effects on intake despite the high dietary fiber content. Tifton 85 bermudagrass may serve as a forage alternative for lactating dairy cows.
给泌乳期奶牛提供含有数量不断增加的蒂夫顿85百慕大草干草或青贮饲料以及不断增加的日粮中性洗涤纤维（NDF）的日粮，以确定百慕大草的储存方法和日粮纤维含量对采食量、产奶量和养分消化率的影响。百慕大草以日粮干物质的8.5%、15.9%或23.3%的比例作为干草或青贮饲料添加，并替代等量的玉米青贮饲料。百慕大草的储存方法不影响采食量[百慕大草干草和青贮饲料日粮的采食量分别为20.8对20.3（±0.3）千克/天]，但日粮中百慕大草和NDF含量的增加确实会降低采食量。日粮NDF浓度远高于美国国家研究委员会的最低建议值。百慕大草的储存方法不会改变产奶量，但随着日粮NDF的增加产奶量会下降。百慕大草青贮饲料的NDF消化率往往低于百慕大草干草。日粮中百慕大草含量的增加改善了日粮干物质、酸性洗涤纤维和NDF的消化率；然而，由于总采食量下降，产奶量也下降了。体外分析证实了添加百慕大草干草或青贮饲料可提高NDF消化率。优质百慕大草杂交种因其良好的消化特性以及尽管日粮纤维含量高但对采食量影响相对较小，有可能用于泌乳期奶牛的日粮中。蒂夫顿85百慕大草可作为泌乳期奶牛的一种饲料替代品。
