Effect of Genotype, Sex, and Age of Birds on the ApparentMetabolizable Energy Value of Feed Ingredients (FishMeal and Maize) on the Broiler Chicks Diet

The effect of genotype, age and sex on the apparent metabolizable energy (AME) and nitrogencorrected AME (AMEn) was studied using male and female chickens of two different genotypes (RIR and Cornish) in 4 and 8 weeks of age. The experiment was carried out for the purpose of better understanding the effect of age and sex of both genotypes on dietary AME and AMEn of corn and fish meal feedstuffs. The results indicated that the different levels of corn (40 and 80 %) and fish meal (4 and 8 %), feedstuffs were not significantly different for metabolizable energy (P>0.05). The effect of different genotypes on the metabolizable energy values obtained for the feed ingredients (corn and fish meal) were not significantly different (P>0.05). This study showed that female chicks may be able to mobilize or retend nitrogen (FN+UN) more than male birds of Cornish (meat type) and RIR (layer type) strains.