Abstract The first experiment was carried out on 180 White Leghorn pullets that were 16 weeks old, housed in individual cages of the California type, and randomly assigned to each of the six prelay feeding strategies (kcal ME per kg /%CP /%Ca) during 16-18 weeks of age. These strategies were as follows: T0 (BIS control-2500/16.0/1.0), T1 (2700/16.0/1.0), T2 (2700/16.0/2.0), T3 (2700/16. The second experiment was carried out on 180 White Leghorn pullets that were sixteen weeks old. These pullets were housed in individual cages of the California type and were randomly assigned to each of the six-layer diet feeding strategies (kcal ME per kg /%CP /%Ca) during 19-40 weeks of age. These strategies were designated as follows: T0 (BIS control-2600/18.0/3.0), T1 (2500/18.0/3.0), T2 (2500/18.