Modern layer chickens are generally divided into three types: white shell laying hens, brown shell laying hens and light brown shell laying hens, and there are different varieties under each type.
Brown-shell hens account for about 70% of the breeding stock, and are named after the brown eggshell. The representative varieties of brown-shell hens are Isa brown, Roman brown, Hyland brown, etc.
chicken farm
Table 1. Isa brown nutritional standards
| Temperature 18–24℃ | Brooding feed
0–4 weeks |
Breeding feed 1
(4–10 weeks) |
Breeding feed 2
(10–16 weeks) |
Pre-production feed
112 days old–2% egg laying |
| Metabolizable energy kcal/kg | 2950-2975 | 2850-2875 | 2750 | 2750 |
| Crude protein % | 20.5 | 19 | 16 | 16.8 |
| Digestible Methionine % | 0.48 | 0.41 | 0.30 | 0.38 |
| Digestible Methionine + Cystine% | 0.78 | 0.66 | 0.53 | 0.60 |
| Digestible Lysine % | 1.0 | 0.85 | 0.64 | 0.71 |
| Digestible Threonine % | 0.67 | 0.57 | 0.43 | 0.48 |
| Digestible tryptophan% | 0.186 | 0.166 | 0.145 | 0.155 |
| calcium% | 1.05-1.1 | 0.9–1.1 | 0.9–1.1 | 2–2.1 |
| Available Phosphorus% | 0.48 | 0.42 | 0.36 | 0.42 |
| sodium% | 0.16 | 0.16 | 0.15 | 0.15 |
Table 2. Hyland Brown Nutrition Standard
| Temperature 18–24℃ | Brooding feed
0–4 weeks |
Breeding feed 1
(4–10 weeks) |
Breeding feed 2
(10–16 weeks) |
Pre-production feed
112daysold–2% egg laying |
| Metabolizable energy kcal/kg | 2811-2922 | 2789-2900 | 2712-2822 | 2734-2933 |
| Crude protein % | 20 | 18.25 | 17 | 16.5 |
| Digestible Methionine % | 0.49 | 0.41 | 0.34 | 0.38 |
| Digestible Methionine + Cystine% | 0.87 | 0.75 | 0.66 | 0.73 |
| Digestible Lysine % | 1.11 | 0.9 | 0.73 | 0.79 |
| Digestible Threonine % | 0.76 | 0.65 | 0.54 | 0.58 |
| Digestible tryptophan% | 0.22 | 0.21 | 0.18 | 0.19 |
| calcium% | 1 | 1 | 1.4 | 2.5 |
| Available Phosphorus% | 0.45 | 0.43 | 0.45 | 0.48 |
| sodium% | 0.18 | 0.18 | 0.17 | 0.18 |
Table 3. Nutritional standard of Roman brown
| Temperature 18–24℃ | Brooding feed
0–4 weeks |
Breeding feed 1
(4–10 weeks) |
Breeding feed 2
(10–16 weeks) |
Pre-production feed
112daysold–2% egg laying |
| Metabolizable energy kcal/kg | 2900 | 2800 | 2780 | 2780 |
| Crude protein % | 20 | 18.5 | 14.5 | 16 |
| Digestible Methionine % | 0.39 | 0.33 | 0.28 | 0.29 |
| Digestible Methionine + Cystine% | 0.68 | 0.57 | 0.5 | 0.56 |
| Digestible Lysine % | 0.98 | 0.82 | 0.53 | 0.70 |
| Digestible Threonine % | 0.65 | 0.57 | 0.4 | 0.49 |
| Digestible tryptophan% | 0.19 | 0.17 | 0.20 | 0.16 |
| calcium% | 1.05 | 1 | 0.95 | 2 |
| Available Phosphorus% | 0.48 | 0.45 | 0.40 | 0.45 |
| sodium% | 0.18 | 0.17 | 0.16 | 0.16 |
From the above table, there is little difference in the nutritional requirements between the varieties of brown-shell hens, but in order to give full play to the production advantages of various varieties of laying hens, it is necessary to combine the growth stage, physiological state and Environmental and other factors, adjust the feed formula in time.
