Potentials of genotype, varied levels of Roxazyme G^® enzyme and their interaction on two genetic stocks of commercial broiler chickens, I: growth performance and carcass traits

Abstract

The growth performance and carcass traits of two commercial broiler stocks were evaluated on the basis of genotype potentials, varied levels of roxazyme G^® enzyme and their interaction. A total of 240 day – old broiler chicks (120 of each of Arbor acre and Marshall birds) were used for this study. The chicks were fed on four experimental diets; 0 g/ton, 100 g/ton, 200 g/ton and 300 g/ton. Data were collected on average bodyweight, daily weight gain, daily feed intake, daily water intake, feed conversion ratio (growth performance) and liveweight, bled weight, defeathered weight, eviscerated weight, breast weight, thigh weight, wing weight, shank weight (primal cuts), gizzard, kidney, heart, liver, abdominal fat (edible visceral organs) and analysed with General Model of SAS in completely randomized designed. Results showed that Arbor acre strain was significantly (P < 0.05) favoured for body weight, daily weight gain, daily feed intake and daily water intake compared with Marshall birds. Birds fed diets supplemented with roxazyme G^® enzyme, especially 300 g/ton gave a higher body weight, daily weight gain, daily feed intake and daily water intake. Also, for carcass traits, Arbor acre had significantly (P < 0.05) higher live weight, bled weight, defeathered weight, eviscerated weight, breast weight, thigh weight, wing weight, shank weight, kidney, heart and abdominal fat than the Marshall birds. It can be concluded that Arbor acre birds were better in respect of growth performance and carcass traits with enzymes interaction. Besides, enzyme inclusion levels of up to 300 g/ton made meaningful responses for growth performance and carcass characteristics.

Keywords: Genotype, roxazyme G^®, broilers, growth performance, carcass traits