ChileanJAR

An attempt was made to find information about protein requirements at different ages of broiler chicks.
In five treatments, different alternatives were programmed by using one, two or three diets per treatment and changing them at diferent ages of the chicks.
The results obtained at 56 days of age indicate that the highest body weight was reached when two diets were used with 22% protein from 0 to 35 days of age and 20% from 35 to 56 days with 3,308 and 3,426 Kcal of M. E. per Kg of feed, respectively. The remaining treatments, where 3 diets with different protein combinations or only one diet, were used in the whole fattening cycle of the chicks, were significantly less effective than the treatments already described.
A correlation was found between high levels of animal protein within diets and mortality due to perosis.