Item | Treatmenta | P-value |
|---|
W80C90 | W80C180 | W130C90 | W130C180 |
|---|
Yield traitsb |
Carcass weight (kg) | 446.33 ± 39.09 | 470.11 ± 43.4 | 464.82 ± 40.24 | 468.58 ± 51.28 | 0.547 |
Back fat thickness (mm) | 12.08 ± 3.15 | 13.44 ± 4.36 | 14.36 ± 3.96 | 11.50 ± 3.61 | 0.270 |
Rib eye area (cm2) | 93.42 ± 11.8 | 94.33 ± 6.06 | 101.45 ± 10.43 | 97.00 ± 9.84 | 0.246 |
Yield index | 65.39 ± 1.87 | 63.99 ± 3.09 | 64.47 ± 3.56 | 65.59 ± 3.32 | 0.579 |
Yield grade scorec | 2.00 ± 0.60 | 1.67 ± 0.71 | 2.00 ± 0.77 | 2.08 ± 0.67 | 0.558 |
Quality traitsd |
Marbling score | 6.58 ± 1.51 | 6.78 ± 1.30 | 7.36 ± 1.03 | 6.33 ± 1.50 | 0.327 |
Meat color | 4.92 ± 0.67 | 4.78 ± 0.67 | 4.91 ± 0.3 | 4.75 ± 0.62 | 0.861 |
Fat color | 2.50 ± 0.52 | 2.43 ± 0.50 | 2.86 ± 0.49 | 2.75 ± 0.45 | 0.086 |
Texture | 1.17 ± 0.39 | 1.00 ± 0.00 | 1.00 ± 0.00 | 1.08 ± 0.29 | 0.363 |
Quality grade scoree | 4.08 ± 0.79 | 4.22 ± 0.67 | 4.36 ± 0.50 | 4.08 ± 0.67 | 0.716 |
- Means ± standard deviation
- aW80C90: weaning at 80 days of age and castration at 90 days of age; W80C180: weaning at 80 days of age and castration at 180 days of age; W130C90: weaning at 130 days of age and castration at 90 days of age; W130C180: weaning at 130 days of age and castration at 180 days of age
- bArea was measured from longissmus muscle taken at 13th rib and back fat thickness was also measured at 13th rib; Yield index was calculated using the following equation: 68.184 - (0.625 × back fat thickness (mm)) + (0.130 × rib eye area (cm2)) - (0.024 × dressed weight amount (kg)); Carcass yield grades from C (low yield) to A (high yield)
- cA grade = 3, B grade = 2, C grade = 1
- dGrading ranges are 1 to 9 for marbling score with higher numbers for better quality (1 = devoid, 9 = abundant); meat color (1 = bright red, 7 = dark red); fat color (1 = creamy white, 7 = yellowish); texture (1 = soft, 3 = firm); quality grades from 3 (low quality) to 1++ (very high quality)
- e1++ grade = 5, 1+ grade = 4, 1 grade = 3, 2 grade = 2, 3 grade = 1
