The effects of different sizes of insoluble grit on growth performance and carcass traits in broiler chickens
ABBAS ALI RAJABIYAN, MOGHADDAM, YAHYA EBRAHIMNEZHAD, ABDOL-AHAD SHADDEL TELI
The present study was conducted to investigate the effects of different sizes of insoluble grit on growth performance and carcass traits in broiler chickens. A total of 200 broilers (Ross 308), 10 days old, were randomly allotted to five experimental equal groups with four replicates of 10 chickens (five male and five female) and fed with basal diet + ground wheat (without grit); basal diet + whole wheat (without grit) and basal diet contain 1.5% grit of diet with sizes of 2, 3 and 4 mm. Growth performance (evaluated through weight gain, feed intake and feed conversion ratio) was determined on day 24 and 42. Also, carcass traits (relative weights of carcass, breast, thigh, liver, heart, gizzard and intestine) and intestine length were assessed on day 42. Weight gains and feed conversion ratio were significantly improved in broilers added with grit 2 mm compared to the control group (p<0.05), whereas; carcass traits were not significantly altered. These data suggest that grit with size of 2 mm improve growth performance in broiler chickens.
Key words: Broiler, carcass, grit, performance