THE INFLUENCE OF INSULIN AND AMINO-ACID SUPPLY ON AMINO-ACID-UPTAKE BY THE LACTATING BOVINE MAMMARY-GLAND

被引:48
作者
METCALF, JA
SUTTON, JD
COCKBURN, JE
NAPPER, DJ
BEEVER, DE
机构
[1] Agriculture and Food Research Council, Institute of Grassland and Environmental Research, Maidenhead, Hurley
关键词
AMINO ACID; BOVINE; MAMMARY GLAND;
D O I
10.3168/jds.S0022-0302(91)78531-7
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Four lactating dairy cows received arterial infusions of insulin (1.41 U/h), an AA mixture (threonine, methionine, leucine, phenylalanine, and lysine at 5.87, 1.90, 3.55, 2.17, and 4.21 mmol/h, respectively), and a combination of the two in a 4 x 4 Latin square. The infusions were performed over a 3-d period directly into the extra pudic artery on both sides of the mammary gland, and samples were taken simultaneously of the downstream extra pudic arterial blood and also of subcutaneous abdominal venous blood. Blood flow was measured by dye dilution using p-amino-hippuric acid and was increased by 37% by infusion of insulin plus AA (P < .05). Infusions of AA tended to increase the arteriovenous difference and uptake of the infused AA (P < .05 for phenylalanine) and had varying effects on the uninfused AA. Inclusion of insulin in the AA infusion tended to increase uptake of infused AA, whereas infusions of insulin alone tended to decrease uptake. There were no significant effects of infusion on milk yield or composition.
引用
收藏
页码:3412 / 3420
页数:9
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