Xu S, Harrison J H, Riley R E, Loney K A
Department of Animal Sciences, Dairy-Forage Facility, Washington State University, Puyallup 98371.
J Dairy Sci. 1994 Mar;77(3):782-8. doi: 10.3168/jds.S0022-0302(94)77013-2.
Lactating Holstein cows (n = 56) were fed high grain TMR in three feeding experiments to determine the effects of two rumen buffers on feed intake, milk production, and milk composition. The basal diet in Experiment 1 was 40% grass silage, 12% whole cottonseed, and 48% concentrate with treatments of 1) control (no added buffer), 2) 1.5% of dietary DM as Alkaten, and 3) 1.5% of dietary DM as Rumen 8. In Experiment 2, diets consisted of 12% corn and sunflower silage, 20% whole cottonseed, and 68% concentrate with treatments as in Experiment 1. The diets in Experiment 3 were identical to those in Experiment 2, except that buffers were increased to 2.2% of dietary DM. The DMI was greater for cows fed buffered diets than control diets in Experiments 2 and 3. Milk production was unaffected by treatment. Milk fat percentage was unaffected by diet in Experiment 1 and averaged 3.8%. Milk fat depression was alleviated for cows fed buffered diets in Experiments 2 and 3. No differences in rumen fluid pH or molar percentage of VFA were significant among treatments.
在三项饲养试验中，给56头泌乳期荷斯坦奶牛投喂高谷物全混合日粮（TMR），以确定两种瘤胃缓冲剂对采食量、产奶量和乳成分的影响。试验1的基础日粮为40%的青贮牧草、12%的全棉籽和48%的精料，处理组分别为：1）对照组（不添加缓冲剂）；2）添加占日粮干物质（DM）1.5%的Alkaten；3）添加占日粮DM 1.5%的Rumen 8。试验2的日粮由12%的玉米和向日葵青贮、20%的全棉籽和68%的精料组成，处理组与试验1相同。试验3的日粮与试验2相同，只是缓冲剂增加到占日粮DM的2.2%。在试验2和试验3中，投喂缓冲剂日粮的奶牛干物质采食量（DMI）高于对照组日粮。产奶量不受处理影响。试验1中乳脂率不受日粮影响，平均为3.8%。试验2和试验3中，投喂缓冲剂日粮的奶牛乳脂率下降得到缓解。各处理组之间瘤胃液pH值或挥发性脂肪酸（VFA）摩尔百分比无显著差异。
