Table 4.
Growth curve parameters according to the Gompertz model (G1) for the Bianca di Saluzzo and Bionda Piemontese chicken breeds: comparison with other breeds/hybrids. Data obtained from references.
| Item | RS1 | RS2 | HUB | B | ||||||||
| F | M | Δ | F | M | Δ | F | M | Δ | F | M | Δ | |
| BWa | 6401 | 6949 | +9 | 4664 | 5475 | +17 | 3657 | 4362 | +19 | 2697 | 3880 | +44 |
| b | 4.44 | 4.79 | +8 | 4.20 | 4.62 | +10 | 4.14 | 4.37 | +6 | 4.03 | 4.39 | +9 |
| k | 0.039 | 0.042 | +8 | 0.036 | 0.036 | 0 | 0.031 | 0.031 | 0 | 0.021 | 0.019 | −10 |
| BWip | 2356 | 2557 | 1716 | 2015 | 1345 | 1605 | 992 | 1427 | ||||
| Tip | 39 | 37 | −5 | 43 | 43 | 0 | 46 | 48 | +4 | 69 | 82 | +19 |
| MGR | 92 | 107 | +16 | 62 | 73 | +18 | 42 | 50 | +19 | 21 | 27 | +29 |
| Item | BS | PA | BP | PC | ||||||||
| F | M | Δ | F | M | Δ | F | M | Δ | F | M | Δ | |
| BWa | 2184 | 3074 | +41 | 2022 | 2245 | +11 | 2012 | 2745 | +36 | 1979 | 2558 | +29 |
| b | 3.32 | 3.55 | +6 | 4.35 | 4.77 | +10 | 3.00 | 3.25 | +10 | 4.01 | 4.16 | +4 |
| k | 0.014 | 0.014 | 0 | 0.021 | 0.020 | −5 | 0.016 | 0.015 | −6 | 0.020 | 0.019 | −5 |
| BWip | 804 | 1131 | 744 | 826 | 740 | 1010 | 728 | 941 | ||||
| Tip | 86 | 96 | +12 | 75 | 81 | +8 | 72 | 80 | +11 | 72 | 76 | +6 |
| MGR | 11 | 16 | +45 | 16 | 17 | +6 | 12 | 15 | +25 | 15 | 18 | +20 |
Data obtained from references where the model G1 or a derived version was used. F: females; M: males; Δ: ((male average − female average)/female average) × 100; BWa: asymptotic body weight (g); b: shape parameter; k: coefficient of relative growth; BWip: body weight at inflection point (g); Tip: age at inflection point (d); MGR: maximum growth rate at inflection point (g/d). Breed RS1: Ross 308 [46]; RS2: Ross 708 [25]; HUB: Hubbard, crossing JA57 × Redbro [23]; B: Berlanda [22]; BS: Bianca di Saluzzo, present investigation; PA: Padovana Argentata [22]; BP: Bionda Piemontese, present investigation; PC: Padovana Camosciata [22]. Except for [46] (which is a review), reported data do not consider any dietary treatment: for each trial, all birds received the same diet.