Role of water in regulating feed intake and feed efficiency of broilers.

Three trials were conducted to investigate the influence of restricting feed and water intake levels of a fast-growing selected broiler line to the same feed and water intake levels of a nonselected line and to investigate the relationship of water/feed ratios to feed conversion (feed/grain) ratios. The water intake of birds from the selected line on feed restriction was similar to that of birds from the selected line not on feed restriction from 1 to 14 days. However, restriction of water intake of selected line birds resulted in feed intake similar to that of nonselected line birds. From 1 to 14 days, feed conversions of the feed-restricted selected line birds were similar to those of the selected line birds not on feed restriction. Feed conversions of the water-restricted selected line birds were similar to those of nonselected line birds. The maximum deviation in water intake between the selected and nonselected lines was observed before the maximum deviation in feed intake between the two lines; and the maximum deviation in feed intake was observed before the maximum deviation in body weight. Data presented indicate that high water/feed ratios are associated with low feed/gain ratios.