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Abstract
1. Guinea‐fowl of both sexes and female chickens were fed from 0 to 12 weeks on diets the energy concentration of which was constant at either 2.6, 2.9 or 3.2 Mcal/kg (10.8, 12.1 or 13.4 MJ/kg) while the calorie to protein ratios were changed, for some groups, from 124 to 157 or 200 at 4 and 8 weeks.
2. Guinea‐fowl, but not chickens, were unable to overconsume when the protein concentration was low with the result that the body fat content was not reduced when the protein concentration was increased.
3. In the second trial the ME level of the diets was fixed at 12.6 MJ/kg while the protein content was varied, from 21 to 28% in the diets fed to 6 weeks of age and from 15 to 24% in those fed from 6 to 12 weeks.
4. It is concluded that for the growing guinea‐fowl the diet should contain 12.6 MJ ME/kg, the protein concentration reducing from 24 to 26% in the period o to 4 weeks to 19 to 20% in the period 4 to 8 weeks and to 16% or less in the period 8 to 12 weeks.