EFFECT OF DIETARY FORAGE - GRAIN RATIO ON BLOOD-CONSTITUENTS IN DAIRY-COWS

被引：30

作者：

DHIMAN, TR ^{[1
]}

KLEINMANS, J ^{[1
]}

TESSMANN, NJ ^{[1
]}

RADLOFF, HD ^{[1
]}

VANEVERT, P ^{[1
]}

SATTER, LD ^{[1
]}

机构：

[1] UNIV WISCONSIN, DEPT DAIRY SCI, MADISON, WI 53706 USA

来源：

JOURNAL OF DAIRY SCIENCE | 1991年 / 74卷 / 08期

关键词：

GLUCOSE; UREA; BETA-HYDROXYBUTYRATE; PLASMA FREE FATTY ACIDS;

D O I：

10.3168/jds.S0022-0302(91)78447-6

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Forty-nine primiparous and 44 multiparous lactating Holstein cows were used to study the effect of five dietary forage: grain ratios on blood constituents. Blood samples were collected in wk 2, 3, 4, 6, 8, 12, and 16 of lactation and were analyzed for glucose, urea, beta-hydroxybutyrate, and FFA. Increasing the percentage of forage in the diet decreased blood glucose concentration. Glucose levels were low at the beginning of lactation and increased as DMI increased. Increasing percentage of forage in the diet did not affect blood urea concentration. Increasing forage in the diet from 38.2 to 98.2% increased beta-hydroxybutyrate concentrations threefold during the first 4 wk of lactation in both primiparous and multiparous cows. The concentration of plasma FFA was higher in all the treatments at the beginning of lactation and decreased as lactation advanced. Dietary forage:grain ratio did not affect plasma FFA.

引用

页码：2691 / 2695

页数：5

共 25 条

[1] GLUCOSE AND FATTY-ACID METABOLISM IN COWS PRODUCING MILK OF LOW FAT CONTENT [J].