期刊文献

Effect of Rumen-Protected Methionine and Lysine on Casein in Milk When Diets High in Fat or Concentrate are Fed 收藏

饲喂高脂肪或高浓度饲料中瘤胃保护蛋氨酸和赖氨酸对牛奶中酪蛋白的影响

原文求助发布源

作者

J.M.Chow[1][2];E.J.DePeters[3];R.L.Baldwin;

作者单位

Department of Animal Science, University of California, Davis 95616[1]This work was taken from a thesis submitted by J. M. Chow to the University of California in partial satisfaction for a Master of Science degree.[2]Deparunent of Animal Science, Cornell University, Ithaca, NY 14853.[3]Reprint requests.

关键词

dietary fat; rumen-protected amino acids; casein;

关键词译文

膳食脂肪;瘤胃保护的氨基酸;酪蛋白;

发布日期

1 April 1990

页码

1051-1061

DOI

10.3168/jds.S0022-0302(90)78764-4

来源信息

Journal of Dairy Science ISSN：0022-0302, 1990年, 73卷, 4期, 1051-1061页

摘要

To examine the effect of supplying methionine and lysine on milk N composition, isoenergetic, isonitrogenous diets containing 50:50 with 3,9% added fat or 25:75 forage to concentrate with no added fat were fed with or without rumen-protected methionine and lysine to four primiparous and four multiparous early lactation (36 d in milk) Holstein cows in two 4 x 4 Latin squares. Diets contained 1.7 Mcal NE₁ and were fed for ad libitum intake. Periods were 21 d. Rumen-protected methionine and lysine increased total N and casein N percentage with the 3.9% fat, but did not increase total N and casein N percentage with the diet without fat. Whey N percentage was greater with the no fat than with the 3.9% fat diet. Whey N percentage was not affected by adding amino acids. Nonprotein N percentage was greater for the diet with the 3.9% fat than with no fat. Proportions of casein N or whey N to total N were unaffected by treatments. Adding methionine and lysine to diets did not increase yields of total N and casein N. The 3.9% fat diet increased proportions of long-chain (C_18:0 and C_18:0) and decreased proportions of short- to medium-chain fatty acids (C₈ to C₁₆) in milk fat. Plasma nonesterified fatty acids and triglyceride concentrations were greater with the 3.9% fat as compared to the no fat diet. Methionine and lysine decreased plasma triglyceride concentrations with the 3.9% fat diet. Milk yields, DM intakes, and plasma glucose concentrations were unaffected by treatment.

摘要译文

为了研究提供蛋氨酸和赖氨酸对牛奶N成分的影响，含有50：50和3的等能量，等氮饮食，没有添加脂肪的蛋白质含有或不含有瘤胃保护的蛋氨酸和赖氨酸至4个初产和4个多胎早期泌乳（牛奶中36天）荷斯坦奶牛在两个4×4拉丁方块中。饮食中含有1.7 Mcal NE 1，并随意喂食。期间为21天。瘤胃保护的蛋氨酸和赖氨酸增加了总N和酪蛋白N百分比，脂肪含量为3.9％，但是没有脂肪的饮食没有增加总N和酪蛋白N的百分比。无脂肪的乳清N百分比高于3.9％的脂肪饮食。乳清N百分比不受添加氨基酸的影响。饮食中非蛋白质N百分比高于3.9％脂肪而非脂肪。酪蛋白N或乳清N与总N的比例不受处理的影响。在饮食中添加蛋氨酸和赖氨酸不会增加总N和酪蛋白N的产量。9％脂肪饮食增加了长链（C 18：0和C 18：0）的比例，并减少了乳脂中短链到中链脂肪酸（C 8至C 16）的比例。与无脂肪饮食相比，3.9％脂肪的血浆非酯化脂肪酸和甘油三酯浓度更高。蛋氨酸和赖氨酸降低了3.9％脂肪饮食的血浆甘油三酯浓度。牛奶产量，DM摄入量和血浆葡萄糖浓度不受治疗影响。

J.M.Chow[1][2];E.J.DePeters[3];R.L.Baldwin;. Effect of Rumen-Protected Methionine and Lysine on Casein in Milk When Diets High in Fat or Concentrate are Fed[J]. Journal of Dairy Science, 1990,73(4): 1051-1061