Table 4. Effects of groups categorized by total number and cross sectional area of muscle fiber on carcass and lean meat productivity traits.
| TNF | High | Low | Levels of significance | ||||||
|---|---|---|---|---|---|---|---|---|---|
| CSAF | Large | Middle | Small | Large | Middle | Small | |||
| Group | HL(n=9) | HM(n=33) | HS(n=64) | LL(n=39) | LM(n=61) | LS(n=33) | TNF | CSAF | TNF×CSAF |
| Carcass weight (kg) | 88.41a(3.23)A | 86.54a(1.70) | 79.88bc(1.21) | 82.75ab(1.63) | 77.86c(1.29) | 71.66d(1.71) | *** | *** | NS |
| Carcass yield (%) | 76.97a(1.09) | 74.83ab(0.58) | 73.89b(0.41) | 74.63ab(0.55) | 74.12b(0.44) | 74.06b(0.58) | † | * | NS |
| Loin area (cm2) | 61.69a(1.84) | 56.03b(0.97) | 48.09c(0.69) | 47.86c(0.93) | 43.03d(0.74) | 38.97e(0.98) | *** | *** | * |
| Back-fat thickness (mm) | 17.24ab(1.87) | 18.13a(0.99) | 16.21ab(0.70) | 16.13ab(0.94) | 14.87b(0.75) | 11.82c(0.99) | ** | ** | NS |
| Daily gain (g/day) | 611.5b(22.94) | 650.4a(12.12) | 616.4b(8.62) | 622.5ab(11.56) | 599.39b(9.16) | 552.4c(12.17) | ** | *** | * |
| Days at 90 kg body weight (kg) | 154.5bc(4.41) | 145.9c(2.58) | 151.2bc(1.72) | 148.1c(2.57) | 154.8b(1.92) | 164.7a(2.35) | * | ** | ** |
| Body weight in 100 days after birth (kg) | 45.16bc(1.87) | 47.22ab(1.11) | 47.63ab(0.75) | 49.86a(1.11) | 46.88b(0.83) | 43.63c(1.02) | NS | NS | ** |
| Plant age (d) | 174.59(2.55) | 174.6(1.39) | 172.7(0.92) | 173.1(1.39) | 175.6(1.03) | 173.7(1.27) | NS | NS | NS |
TNF, total number of muscle fiber; CSAF, cross sectional area of muscle fiber; HL, high TNF and large CSAF; HM, high TNF and middle CSAF; HS, high TNF and small CSAF; LL, low TNF and large CSAF; LM, low TNF and middle; LS, low TNF and small CSAF.
NS, not significant; †p<0.1, *p<0.05, **p<0.01, ***p<0.001.
a-eLeast-square means with different superscripts in the same row are significantly different (p<0.05).
AStandard error of least-square means.