The effect of photoperiod and nutrition on ascites incidence in broilers.

Light restriction was used to restrict growth of male broilers up to 41 days of age. Dietary energy and lysine were also investigated for their interaction with slowed growth rate. A total of 1440 male broilers was used in each of two trials. Light restriction significantly reduced body weights at 22 days (P < or = 0.05) but not at 52 days. Restricting early growth by photoperiod for the 3-to-41-day period reduced deaths due to ascites. Neither dietary energy nor lysine affected mortality from ascites. These results suggest that manipulation of photoperiod for young broilers is a useful way to limit early growth and subsequent ascites mortality.