Table 7.
Effect of genotype, sex and diet on histological characteristics of PM.
| Genotype | Sex | Diet | Number of muscle fibers per 1 mm2 | Cross-sectional area (μm2) | Diameter (μm) |
|---|---|---|---|---|---|
| Ross | Male | C | 260.0 | 3,296A | 224.6A |
| LP | 238.7 | 3,021B | 208.6B,C,D | ||
| Female | C | 223.3 | 3,299A | 222.3A,B | |
| LP | 228.7 | 3,417A | 227.3A | ||
| JA757 | Male | C | 249.3 | 2,960B | 212.0B,C |
| LP | 254.7 | 2,986B | 209.5C,D | ||
| Female | C | 276.0 | 2,753C | 201.1D | |
| LP | 259.3 | 2,975B | 211.3C | ||
| ISA Dual | Male | C | 450.4 | 1,440E | 146.4G |
| LP | 424.7 | 1,750D | 163.9E | ||
| Female | C | 429.1 | 1,598D | 152.3F,G | |
| LP | 458.0 | 1,654D | 157.0E,F | ||
| SEM | 12.23 | 20.90 | 1.00 | ||
| P-value | |||||
| Genotype | <0.001 | <0.001 | <0.001 | ||
| Sex | 0.969 | 0.290 | 0.586 | ||
| Diet | 0.771 | 0.047 | 0.101 | ||
| G∗S∗D | 0.513 | 0.001 | <0.001 | ||
A−GValues in the same subgroup of variables with different supercripts differ (P ≤ 0.01).
Abbreviations: C, control group fed a conventional diet for growing chickens; D, diet; G, genotype; LP, chickens fed a low-protein diet; PM, pectoralis major; S, sex.