Restricting energy intake of laying hens: Effects of different patterns of restriction and rehabilitation

Abstract

1. Light hybrids were subjected to ten treatments, consisting of different timing, length and severity of energy restriction alternating with periods of unrestricted feeding, between 24 and 68 weeks of age.

2. The pattern of restriction had no direct effect but affected egg production indirectly through its influence on overall energy intake.

3. Groups fed ad libitum throughout laid more and heavier eggs than any restricted group.

4. A decrease in daily egg output of about 4 g was associated with each 100 kJ reduction in daily metabolisable energy intake.