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The Marginal Efficiency of Utilization of All Ileal Digestible Indispensable Amino Acids for Protein Gain Is Lower than 30% in Preruminant Calves between 80 and 240 kg Live Weight

Manuscript received 6 January 1998. Initial reviews completed 13 February 1998. Revision accepted 8 June 1998.

Walter J. J. Gerrits*, dagger , , Johan W. Schrama*, and Seerp Tamminga*

* Animal Nutrition Group, Wageningen Institute of Animal Sciences (WIAS), Wageningen Agricultural University, 6700 AH, Wageningen, The Netherlands and dagger  TNO Nutrition and Food Research Institute, Department of Human and Animal Nutrition (ILOB), 6700 AA, Wageningen, The Netherlands

A previous study showed that the marginal efficiency of utilization of digestible nitrogen for deposition in the body in preruminant calves is only ~30%. The study consisted of two similar experiments that were performed in two live weight ranges: 80-160 and 160-240 kg. In each experiment, 36 calves were allotted to one of twelve dietary treatments, consisting of six protein intake levels at each of two protein-free energy intake levels. This paper presents amino acid analyses of dietary and body proteins of these experiments with the following goals: 1) to identify possible limiting indispensable amino acids, and 2) to quantify the effect of protein and energy intake on the amino acid composition of deposited body proteins. The marginal efficiency of utilization of ileal digestible amino acids for deposition in the body did not exceed 30% for any of the indispensable amino acids. Increasing protein intake increased the ratio of indispensable to dispensable amino acids in deposited body proteins, likely caused by an increase in muscle-to-bone ratio in the carcass with a concomitant decrease in the proportion of collagen protein. It was concluded that the low marginal efficiency of utilization of digestible milk proteins for growth in preruminant calves of this weight range was not caused primarily by a severe limitation of a single indispensable amino acid in the diet.

Key words: amino acid composition, amino acid utilization, preruminant calves bullet  protein metabolism, body protein.

The Journal of Nutrition Vol. 128 No. 10 October 1998, pp. 1774-1785
Copyright ©1998 by the American Society for Nutritional Sciences




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