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O trabalho foi realizado para avaliar as características de carcaça e carne de suínos machos castrados e imunocastrados alimentados com dietas contendo diferentes níveis nutricionais. O delineamento experimental foi inteiramente casualizado com quatro tratamentos principais (T1-suínos machos castrados alimentados com dieta basal; T2-machos imunocastrados alimentados com dieta basal; T3-machos imunocastrados alimentados com dieta basal+3% aminoácidos e energia; T4-machos imunocastrados alimentados com dieta basal+5% aminoácidos e energia) e dois tratamentos secundários com ou sem ractopamina dentro de cada tratamento principal. Os suínos machos castrados apresentaram peso de abate 3,3% inferior (P<0,05), peso de carcaça fria 1,4% superior (P<0,05) e peso de carré 13% superior (P<0,05) em relação aos machos imunocastrados. Suínos machos imunocastrados suplementados com 5% a mais de aminoácidos e energia apresentaram costela 19% mais (P<0,05) pesada e valores superiores (P<0,05) na coloração b* (amarelo-azul) na carne aos 45min e às 24h pós-abate em relação aos machos castrados alimentados com a dieta basal. A suplementação com 5% de aminoácidos e energia aumenta o peso e rendimento de costela e altera o valor da coloração b* (amarelo-azul) na carne aos 45min e às 24h pós-abate de suínos machos imunocastrados. The study was carried out to evaluate the carcass characteristics and meat of surgically castrated and immunocastrated pigs fed with different nutritional levels. The animals were distribuited in a completely randomized experimental design with four main treatments (T1-surgically castrated pigs fed with basal diet; T2-immunocastrated pigs fed with basal diet; T3-immunocastrated pigs fed with basal diet+3% amino acids and energy; T4-immunocastrated pigs fed with basal diet+5% amino acids and energy) and two secondary treatments with or without ractopamine within each main treatment. The surgically castrated pigs had slaughter weight 3.3% lower (P<0.05), cold carcass weight 1.4% higher (P<0.05) and loin chop weight 13% higher (P<0.05) compared to immunocastred pigs. The immunocastrated pigs supplemented with 5% more amino acids and energy had rib 19% more heavier (P<0.05) and higher values (P<0.05) in the color b* (yellow-blue) in the meat to 45min and 24h post-slaughter compared with surgically castrated pigs fed with basal diet. Supplementation with 5% amino acids and energy increases weight and yield of rib and changes the value of color b* (yellow-blue) in the meat to 45min and 24h post-slaughter male pigs immunocastrated

Características de carcaça e da carne de suínos machos castrados e imunocastrados alimentados com diferentes níveis nutricionais