Table 5. Effect of dietary crude protein and amino acid supplementation on breast meat, muscle cross-sectional area, muscle fiber characteristics¹

Item	Experimental diets			SEM	P-value
	CON	CP 1% reduced
		OAA	HAA
Body weight (g)	1,630	1,600	1,576	21.98	0.24
Breast meat (g)	275	276	262	9.1	0.44
Muscle cross-sectional area (cm2)	19.3	20.6	19.2	0.89	0.43
Muscle fiber characteristics
Muscle fiber
Fiber cross-sectional area (μm2)	2,412b	3,009a	2,498ab	128.0	0.04
Fiber density	417.1a	333.5b	401.2a	16.20	0.03
Total number of fiber (no./μm2)	740.3	724.2	777.6	66.54	0.83

Data are means of six pens of 12 male Ross 308 chicks from 7 to 28 d post-hatch.
Means in a row with no common superscript letter differ significantly (P<0.05).