三种浓度的DL-蛋氨酸或蛋氨酸羟基类似物对产奶量和牛奶成分的影响。

Influence of three concentrations of DL-methionine or methionine hydroxy analog on milk yield and milk composition.

作者信息

Lundquist R G, Otterby D E, Linn J G

出版信息

J Dairy Sci. 1985 Dec;68(12):3350-4. doi: 10.3168/jds.S0022-0302(85)81245-5.

Abstract

Sixty-eight Holstein cows were fed diets consisting of 60% concentrate and 40% forage, dry basis. Diets were supplemented with DL-methionine or methionine hydroxy analog at either 0, .1, .2, or .3% of the concentrate. Dietary protein averaged 14% of total dry matter on all diets except for a positive control diet, which was 19% crude protein. Data were collected beginning 4 d postpartum and continued through 116 d postpartum. Milk yield was not influenced by either DL-methionine or methionine hydroxy analog. Supplementation with DL-methionine resulted in a quadratic response in milk fat percentage (3.34, 3.58, 3.72, 3.42) at 0, .1, .2, and .3% of the concentrate, respectively. Milk fat percentage increased linearly (3.34, 3.64, 3.60, 3.73) with supplementation of methionine hydroxy analog at 0, .1, .2, and .3%, respectively.

摘要

68头荷斯坦奶牛被饲喂干物质基础上由60%精料和40%草料组成的日粮。日粮中分别添加0、0.1%、0.2%或0.3%的DL-蛋氨酸或蛋氨酸羟基类似物。除了正对照日粮（粗蛋白含量为19%）外，所有日粮的粗蛋白平均占总干物质的14%。从产后4天开始收集数据，并持续到产后116天。奶产量不受DL-蛋氨酸或蛋氨酸羟基类似物的影响。分别在精料中添加0、0.1%、0.2%和0.3%的DL-蛋氨酸，导致乳脂率呈二次曲线反应（分别为3.34、3.58、3.72、3.42）。分别在精料中添加0、0.1%、0.2%和0.3%的蛋氨酸羟基类似物，乳脂率呈线性增加（分别为3.34、3.64、3.60、3.73）。