Table 1: Composition of the diets (control 17% and low protein 8%).

IngredientsAmount for 1 Kg of diet
Low proteinControl

Casein79.3 g179.3 g
Vitamin mix*10 g10 g
Mineral mixture#35 g35 g
Cellulose50 g50 g
Bitartarato of choline2.5 g2.5 g
DL-methionine3.0 g3.0 g
Soya oil70 mL70 mL
Corn starch750.2 g650.2 g

#Mineral mixture contained the following (mg/kg of diet): CaHPO4, 17200; KCI, 4000; NaCl, 4000; MgO, 420; MgSO4, 2000; Fe2O2, 120; FeSO4·7H2O, 200; trace elements, 400 (MnSO4·H2O, 98; CuSO4·5H2O, 20; ZnSO4·7H2O, 80; CoSO4·7H2O, 0.16; KI, 0.32; sufficient starch to bring to 40 g [per kg of diet]). *Vitamin mixture contained the following (mg/kg of diet): retinol, 12; cholecalciferol, 0.125; thiamine, 40; riboflavin, 30; pantothenic acid, 140; pyridoxine, 20; inositol, 300; cyanocobalamin, 0.1; menadione, 80; nicotinic acid, 200; choline, 2720; folic acid, 10; p-aminobenzoic acid, 100; biotin, 0.6.