Physiological determinants to optimize metabolic utilization of dietary amino acids for animal protein production

Schreurs, V.V.A.M.; Doeschate, R.A.H.M. ten; Boekholt, H.A.; Koopmanschap, R.E.

doi:10.18174/njas.v42i1.613

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“…(1997). S CHREURS et al. (1994) estimated the conversion efficiency of amino acids from whole‐egg to 1‐day‐old‐chick and found that tryptophan was utilized considerably less than any other amino acid.…”

Section: Discussionmentioning

confidence: 99%

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

Heger¹,

Phung²,

Křížová³

2002

Animal Physiology Nutrition

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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.

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Section: Discussionmentioning

confidence: 99%