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Journal of Dairy Science Vol. 74 No. 10 3412-3420
© 1991 by American Dairy Science Association ®
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The Influence of Insulin and Amino Acid Supply on Amino Acid Uptake by the Lactating Bovine Mammary Gland

J. A. Metcalf 1, J. D. Sutton 1, J. E. Cockburn 1, D. J. Napper 1, and D. E. Beever 1

1 Agriculture and Food Research Council Institute of Grassland and Environmental Research, Hurley, Maidenhead, England

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 rho-amino-hippuric acid and was increased by 37% by infusion of insulin plus AA (rho < .05). Infusions of AA tended to increase the arteriovenous difference and uptake of the infused AA (rho < .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.

Key Words: amino acid • bovine • mammary gland

Submitted on December 14, 1990
Accepted on May 13, 1991




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