| Abstract: | The nitrogen (N) metabolic experiments were made
to estimate separately amino acid requirements of 4348 weeks old layers for maintenance, for
protein accretion to estabolish models to estimate digestible amino acid requirements. The
regression relationship of nitrogen retention vs amino acid intake was estimated for each amino
acid by giving, at rate of N intake of 091, 052, 015 and 0007gkg-1 body-weight (W075) per d, the
semi-synthetic diets was made specially deficient in one amino acid. From the regression
coefficients, it was calculated that, for the accretion of 1 g protein, the dietary digestible amino
acid requirements were (mg) Thr 631, Val 1004, Met 399, Ile 886, Leu 1143, Phe 632, Lys 870,
His 205, Arg 879, Trp 214, Met Cys 776, and Phe Tyr 1143. Daily amino acid requirements for
N equilibrium were estimated to be (mgkg-1W075 per day) Thr 506, Val 747, Met 303, ILe 667
Leu 814, Phe 448, Lys 605 His 147, Arg 739 ,Trp 173, Met Cys 586, and Phe Tyr 839 The
dietary degestible amino acid patterns for protein accretion and N equilibrium were also
proposed. The models of estimating digestible amino acid requirements for the different
productions were developed. |
