Table 6.
Model parameters for fast growing naked neck chicken related to age period, genotype and sex.
| Starter period (days 10–20) | Grower period (days 25–35) | |||||||
|---|---|---|---|---|---|---|---|---|
| Na/Na | Na/na | Na/Na | Na/na | |||||
| Males | Females | Males | Females | Males | Females | Males | Females | |
| NMR 1 | 262 | 348 | 224 | 392 | 341 | 384 | 346 | 395 |
| NRmaxT 2 | 3763 | 3857 | 3965 | 4049 | 3397 | 2881 | 3512 | 3034 |
| NDmaxT 3 | 3501 | 3509 | 3741 | 3657 | 3056 | 2497 | 3166 | 2639 |
| PDmaxT 4 | 13.8 | 13.8 | 14.7 | 14.4 | 25.1 | 20.5 | 26.0 | 21.6 |
| Probabilities | ||||||||
| NMR 1 | NRmaxT 2 | NDmaxT 3 | PDmaxT 4 | |||||
| Genotype | 0.912 | 0.626 | 0.663 | 0.827 | ||||
| Sex | 0.035 | 0.545 | 0.419 | 0.572 | ||||
| Age | 0.192 | 0.005 | 0.004 | <0.001 | ||||
1 NMR = daily N maintenance requirement (mg/BWkg0.67). 2 NRmaxT = theoretical maximum of daily N retention (mg/BWkg0.67). 3 NDmaxT = theoretical maximum of daily N deposition (mg/BWkg0.67). 4 PDmaxT = theoretical maximum of protein deposition (g/d) for chicken at 500g BW (starter period) and 1.500g BW (grower period).