Effect of mannanase-supplemented PKE-based diets on the growth performance, feed efficiency and dressing percentage of broilers

A feeding trial was conducted to determine the effects of mannanase supplementation and various levels of palm kernel expeller (pke)-based diets on the growth performance, feed intake and feed efficiency of cobb broilers. the birds were fed 0, 8, 16 and 24% pke-based diets with or without mannanase supplementation. the study involved a total of 160 one-day-old male cobb chicks randomly assigned to eight treatments with four replicates each and five birds per replicate. there were no significant differences (p >0.05) in feed intake, weight gain, feed conversion ratio and dressing weight percentage when comparing birds fed with pke supplemented with or without enzyme with birds fed with corn-soybean diet (control). this study showed that pke inclusion levels up to 24% did not result in any adverse effect on broiler production. supplementation of pke-based diets with mannanase had no beneficial effect on growth performance and feed efficiency