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The efficiency of amino acid utilisation by the mammary gland of holstein friesian cows fed three levels of dietary crude protein

  • J A Metcalf (a1), D Wray-Cahen (a1), B J Bequette (a2), F R C Backwell (a2), D J Humphries (a3), D E Beever (a3) and J D Sutton (a3)...

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Although milk output is known to be affected by dietary manipulation, studies have so far failed to provide sufficient information to successfully predict dietary effects on both milk protein content and yield (Thomas 1983). In a further effort to determine the metabolic control of milk protein synthesis three diets containing different levels of crude protein were fed to four Holstein-Friesian cows in early- to mid-lactation, and metabolite flow across the mammary gland was measured in relation to milk protein production.

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Davis, S.R. and Mepham, T.B. (1974). Amino acid and glucose uptake by the isolated perfused guinea pig mammary gland. Quarterly Journal of Experimental Physiology. 59:111
Metcalf, J.A., Sutton, J.D., Cockbum, J.E., Napper, D.J and Beever, D.E. (1991). The influence of insulin and amino acid supply on amino acid uptake by the lactating mammary gland. Journal of Dairy Science 74:3412
Thomas, P.C.(1983).Milk Protein. Proceedings of the Nutrition Society.42:40

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The efficiency of amino acid utilisation by the mammary gland of holstein friesian cows fed three levels of dietary crude protein

  • J A Metcalf (a1), D Wray-Cahen (a1), B J Bequette (a2), F R C Backwell (a2), D J Humphries (a3), D E Beever (a3) and J D Sutton (a3)...

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