11th World Conference on Animal Production, China, 1 - 04 October 2013, pp.358
Alternative poultry production systems have met the sensitivities of the prosperous EU and US public concerning animal welfare, environment conservation and sustainability, and demand for superior taste products. The extensive indoor raising system is one of the animal welfare-oriented alternative broiler production systems. The aim of this study was to evaluate the relationship between slaughter ages and slaughter-carcass characteristics in fast and medium growing broilers raised extensive indoor system. With this purpose, fast-growing and medium-growing chicks were housed in 16 floor pens (12 chicks/m2) during the experiment. All of birds were fed with same starter and grower diets, and exposed to 18 hours lighting. Birds of both genotypes were slaughtered at 56 and 63 days of age. Carcass, breast, leg, wing, edible inner organs and abdominal fat were expressed as percentage of body weight. Slaughter age had significant effects on the all of studied traits except percentage of wing, indicating that the body weight and yield of cold carcass, carcass parts, abdominal fat, and percent of abdominal fat increased with increasing slaughter age. Fast growing broilers had higher average values for slaughter weight, carcass weight and yield of cold carcass, breast and leg. Taking into account the slaughter and carcass results, medium growing broilers have disadvantage compared to fast growing genotype. These data indicate differences among genotypes and provide information about the efficiency and potential for extensive indoor system.
Keywords: Alternative poultry production, Carcass traits, Broiler genotypes