Efficiency of amino acid utilization in the growing pig at suboptimal levels of intake: lysine, threonine, sulphur amino acids and tryptophan

Journal of Animal Physiology and Animal Nutrition
Jaroslav HegerL Krízová

Abstract

A series of N balance experiments using growing pigs was conducted to study the efficiency of utilization of lysine, threonine, sulphur amino acids and tryptophan and to estimate their maintenance requirements. Purified diets based on casein and crystalline amino acids as the sole source of N contained graded levels of each amino acid, corresponding to expected protein accretion rate of 0, 33, 66, 99 and 132 g/day, respectively. N retention increased linearly (p < 0.01) as the dietary concentration of the limiting amino acid increased. Based on linear regression equations relating amino acid deposition in body protein to amino acid intake, marginal efficiencies of ileal digestible amino acid utilization were calculated to be lysine 0.91, threonine 0.83, sulphur amino acids 0.85 and tryptophan 0.66. Extrapolating the regression equations to zero N retention, the daily requirements of amino acids for N equilibrium were estimated to be (mg/kg(0.75)) lysine 39, threonine 49, sulphur amino acids 46 and tryptophan 16.

Citations

Nov 15, 2008·Amino Acids·David H Baker
May 31, 2012·Archives of Animal Nutrition·Britta BlankAndreas Susenbeth
Dec 6, 2005·Proceedings of the National Academy of Sciences of the United States of America·David H Baker
Jan 15, 2009·Journal of Animal Physiology and Animal Nutrition·J HegerD Hampel
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