RELATIONSHIP BETWEEN FEED WITHDRAWAL AND VISCERA CONDITION OF BROILERS

This study was conducted to investigate the effects of feed withdrawal on the viscera of commercial broilers. Birds were withdrawn from feed 0, 3, 9, 12, 14, 16, or 18 h before slaughter. Crop and gizzard conte nts were determined after dissection, and intestinal shape and villi w ere subjectively scored. Raw liver color was measured colorimetrically . Length of feed withdrawal (time) and its interaction with grower (ti me by grower) and replication (time by replication) had a significant effect (P < 0.05) on gizzard contents, intestinal shape, and villi; ho wever, time by grower and time by replication did not affect the crop contents or the incidence of bile contamination in the digestive tract . Results also suggested that the integrity of the intestines declined after 12 to 14 h feed withdrawal, as indicated by heavy intestinal sl oughing. Color analyses of livers showed that length of feed withdrawa l did not affect lightness (L values), but livers became less red (lo wer positive a) as feed withdrawal time increased. It was concluded t hat length of feed withdrawal significantly affected the gastrointesti nal tract; however, variation in the appearance of the Liver could not be attributed solely to broiler feed withdrawal time.