Diet formulation: One series of diets (Normal) was
formulated to provide diets that met nutrient standards
for growing broilers suggested by the breeder using
corn and soybean meal as intact sources of crude
protein with supplemental amino acids (Diets 1, 2, 3 and
4, Table 1). Other diets were formulated to contain 15%
CP (low protein) or 24 and 32% CP (high protein series)
while remaining constant in metabolizable energy
content. Within each protein level, a ratio of amino acids
to dietary protein was maintained that had the same
relationship as did the NRC (1994) recommendations
for 0-3 week in relation to a 23% CP diet, with the
exception that the lysine level was adjusted to 1.25% per
23% CP. The low and high protein diets were similar in
content of supplemental vitamins, trace minerals, Results
sodium, calcium and available phosphorus.