Table 9. Amino acid requirement (% of feed) of white leghorn which have 95% laying eggs

Amino acid level	Feed intake (gm/day/bird)
	120	110	100	90	80	70
Metabolizable energy (kcal/kg)	2,700	2,700	2,800	2,850	2,850	2,900
Crude protein (%)	14.0	15.5	17.0	19.0	20.5	22.1
Arginine (%)	0.60	0.68	0.75	0.82	0.90	0.98
Histidine (%)	0.14	0.15	0.17	0.19	0.22	0.25
Isoleucine (%)	0.50	0.57	0.63	0.69	0.73	0.82
Leucine (%)	0.73	0.82	0.91	1.00	1.09	1.18
Lysine (%)	0.56	0.63	0.70	0.77	0.84	0.91
Methionine (%)	0.31	0.34	0.37	0.41	0.47	0.56
Methionine + cystine (%)	0.53	0.58	0.64	0.71	0.80	0.91
Phenylalanine (%)	0.38	0.42	0.47	0.52	0.57	0.61
Phenylalanine + tyrosine (%)	0.65	0.75	0.83	0.91	0.99	1.08
Threonine (%)	0.50	0.57	0.63	0.69	0.73	0.82
Tryptophan (%)	0.12	0.14	0.15	0.17	0.18	0.20
Valine (%)	0.56	0.63	0.70	0.77	0.82	0.91