Table 1.

Number of fibers (expressed as percentage) positively stained to reduced nicotinamide adenine dinucleotide tetrazolium reductase (NADH-TR) and/or alpha-glycerophosphate dehydrogenase (α-GPD) in pectoralis major muscles belonging to a fast-growing genotype exhibiting either macroscopically normal appearance (NORM) or affected by white striping (WS), wooden breast (WB), or spaghetti meat (SM) abnormalities. The results obtained in fast-growing NORM muscles were also compared with those found in pectoralis major belonging to a slow-growing genotype. Values are expressed as mean ± standard error of the mean (SEM).

	+NADH-TR (%)	+α-GPD (%)	+NADH-TR/+ α-GPD (%)
NORM	9.5 c ± 0.3	91.1 a ± 0.3	7.2 b ± 0.5
WS	13.4 b ± 0.3	87.7 b ± 0.3	9.6 b ± 0.3
WB	10.9 bc ± 0.5	89.9 ab ± 0.3	8.0 b ± 0.8
SM	19.7 a ± 3.2	82.3 c ± 0.4	14.3 a ± 3.6
p-value	<0.001	<0.001	<0.001
Fast-growing (NORM)	9.5 a ± 0.3	91.1 b ± 0.3	7.2 a ± 0.5
Slow-growing	2.0 b ± 0.5	97.3 a ± 0.2	1.4 b ± 0.4
p-value	<0.001	<0.001	<0.001

^a–c = p < 0.05. Mean values followed by different superscript letters significantly differ among the groups.