Teh T H, Trung L T, Jia Z H, Gipson T A, Ogden K B, Sweeney T F
E (Kika) de la Garza Institute for Goat Research, Langston University, OK 73050.
J Dairy Sci. 1994 Jan;77(1):253-8. doi: 10.3168/jds.S0022-0302(94)76948-4.
This study determined the responses of early lactating goats fed varying amounts of rumen-inert fat. Forty multiparous high producing Alpine does in the first 2 wk of lactation were assigned randomly to four isonitrogenous dietary treatments containing 0, 3, 6, and 9% added fat. The study consisted of a 2-wk preliminary and a 10-wk experimental period. Feed intake, blood glucose, and rumen pH were not affected by dietary treatments. Body weight gain and milk production decreased linearly as dietary fat increased. Peak production was higher with 3% added fat than with 6 and 9%. The SCC, total solids, and lactose contents of milk were unaffected by fat percentage. Milk fat percentage increased linearly as fat percentage increased; milk protein content was highest at 6% dietary fat addition. The rumen-inert fat tended to increase long-chain fatty acids and to reduce short-chain fatty acids of milk. These findings suggest that fat supplementation at 3% of the total diet can increase fat percentage in milk from high producing dairy goats in early lactation.
本研究测定了饲喂不同量瘤胃惰性脂肪的初产泌乳山羊的反应。40只处于泌乳前2周的经产高产阿尔卑斯母羊被随机分配到四种等氮日粮处理组，日粮分别添加0%、3%、6%和9%的脂肪。本研究包括为期2周的预试期和为期10周的试验期。采食量、血糖和瘤胃pH不受日粮处理的影响。随着日粮脂肪增加，体重增加和产奶量呈线性下降。添加3%脂肪时的产奶峰值高于添加6%和9%脂肪时的。牛奶的体细胞数、总固形物和乳糖含量不受脂肪百分比的影响。乳脂肪率随脂肪百分比增加呈线性增加；日粮添加6%脂肪时乳蛋白含量最高。瘤胃惰性脂肪倾向于增加牛奶中的长链脂肪酸并减少短链脂肪酸。这些发现表明，日粮中添加3%的脂肪可以提高初产泌乳高产奶山羊的乳脂肪率。
