The Nutritive Value of Palm Kernel Meal and the Effect of Enzyme Supplementation in Practical Diets for Red Hybrid Tilapia (Oreochromis sp.)

摘要

A 9-week feeding trial was conducted to evaluate the nutiitive value of palm kernel meal (PKM) as a dietary ingredient in pelleted feed for red hybrid tilapia Three commercially available feed enzymes were also assessed in an attempt to enhance the nutritive value of PKM. Seven isonitrogenous (30% crude protein) and isoenergetic (15 1 kJ g~(-1)) practical diets were formulated and fed to triplicate groups of 10 fish (mean initial weight 8.0 ± 0.lg) The control diet contained no PKM, and three otherdiets contained 10, 20 and 40% PKM, respectively, replacing soybean meal in the basal diet formulation. Three additional diets were formulated with 40% PKM and supplemented with increasing dosage of commercial feed enzymes known to improve growth performance in poultry fed plant proteins. Growth performance, feed conversion ratio and piotein efficiency ratio of tilapia fed up to 20% PKM was not significantly different (P>0 05) compared to fish fed the control diet. The addition of PKM in the diets of red tilapia resulted in lower dry matter, protein, lipid and energy digestibility coefficients at all levels of dietary inclusion Enzyme supplementation significantly improved dry matter and energy digestibility coefficients of the 40% PKM diet; however, no beneficial effects on the growth and feed utilization efficiency of red tilapia were observed. It was concluded that PKM is a potential partial substitute for soybean meal in tilapia diets.