Genotype x environment interaction in growing chickens: comparison of four genetic groups on two rearing systems under tropical conditions

body weight broiler chickens crianza extensiva crianza intensiva extensive husbandry feed intake gain de poids ganancia de peso genotype environment interaction heterosis intensive husbandry intestin intestines intestinos peso corporal poids corporel pollo de engorde poulet de chair prise alimentaire (animaux) slaughter weight tanzania tanzanie vigueur hybride weight gain