Ireland-Perry R L, Stallings C C
Department of Dairy Science, Virginia Polytechnic Institute and State University, Blacksburg 24061-0315.
J Dairy Sci. 1993 Apr;76(4):1074-82. doi: 10.3168/jds.S0022-0302(93)77436-6.
A trial was designed to study the relationships of dietary fiber and protein percentage and source to fecal consistency in lactating cattle. Thirty Holstein cows were assigned randomly to one of six TMR through four 21-d periods. The TMR were formulated to contain 17 or 25% ADF and CP of 15 or 22% with soybean meal supplementation or 22% with a combination of corn gluten and soybean meals. Two forage combinations were corn silage with or without alfalfa. Fecal consistency was evaluated using a four-point visual observation scale. Lower dietary fiber reduced fecal pH, score, NDF, and ADF but increased fecal DM and starch. A higher percentage of soybean meal lowered fecal DM and fecal score. Forage source affected fecal DM, NDF, ADF, and starch, but not pH or score. Prediction of fecal score from dietary components and cow parameters resulted in dietary DM percentage and 4% FCM as the most related variables. Accurate prediction of fecal consistency score from dietary and cow parameters was not possible.
设计了一项试验，以研究膳食纤维、蛋白质百分比及来源与泌乳奶牛粪便稠度之间的关系。30头荷斯坦奶牛通过四个21天的周期随机分配到六种全混合日粮（TMR）中的一种。TMR的配方为含有17%或25%的酸性洗涤纤维（ADF），粗蛋白（CP）为15%或22%，补充豆粕，或22%，由玉米蛋白粉和豆粕组合而成。两种饲草组合为有或没有苜蓿的玉米青贮。使用四分视觉观察量表评估粪便稠度。较低的膳食纤维降低了粪便pH值、评分、中性洗涤纤维（NDF）和酸性洗涤纤维，但增加了粪便干物质（DM）和淀粉含量。较高比例的豆粕降低了粪便干物质和粪便评分。饲草来源影响粪便干物质、中性洗涤纤维、酸性洗涤纤维和淀粉，但不影响pH值或评分。根据日粮成分和奶牛参数预测粪便评分，得出日粮干物质百分比和4%乳脂校正乳（FCM）是最相关的变量。无法根据日粮和奶牛参数准确预测粪便稠度评分。
