Acta Scientiarum: Animal Sciences (Jan 2011)
Cloridrato de ractopamina em dietas para suínos em terminação = Ractopamine hidrochloride in diets for finishing pigs
Abstract
O presente trabalho objetivou avaliar o uso de ractopamina em diferentes niveis de inclusao na dieta para suinos em terminacao. Foram utilizados 50 suinos hibridos comerciais com peso inicial de 74,08 (1,42) kg, aleatoriamente distribuidos em cinco blocos casualizados. Havia dois animais em cada parcela experimental, macho e femea, alimentados com dieta suplementada com ractopamina (0, 5, 10, 15 e 20 ppm) durante 28 dias. Foram avaliados desempenho e caracteristicas de carcaca dos animais. A ractopamina melhorou odesempenho, espessura de toucinho, profundidade, area de olho de lombo e rendimento de carne na carcaca, porem sem influenciar no consumo de racao, rendimento de cortes e qualidade da barriga. Exceto a dose de 0 ppm, nao houve diferenca entre as doses de ractopamina utilizadas. O modelo de regressao Linear Response Plateau, aplicado nas variaveis onde houve significancia, estimou o ponto otimo de suplementacao deste aditivo entre 4,09 a 5,14 ppm. Houve aumento de 6,09% no indice de bonificacao quando foi utilizado o nivel de 5 ppm de ractopamina. Conclui-se que a ractopamina e eficaz em melhorar odesempenho e as caracteristicas de carcaca de suinos em terminacao.The present work was carried out to evaluate different inclusion levels of ractopamine in diets for finishing pigs. Fifty animals with initial weight of 74.08 (1.42) kg selected for high meat deposition were used, randomly allotted in five blocks. Each experimental unit had two animals, barrow and gilt, fed diets with ractopamine (0, 5, 10, 15 and 20 ppm) for 28 days. Growth performance and carcass characteristics were evaluated. Ractopamine improved final weight, average daily gain, feed:gain ratio, backfat thickness, loin depth, loin eye area and lean tissue yield, but did not influence feed intake, cut yields and belly quality. No differences were found among the doses of ractopamine utilized. The optimum level of supplementation of this additive, as estimated by the Linear Response Plateau regression model, was between 4.09 and 5.14 ppm. There was an average increase of 6.09% in the bonus index when ractopamine was used. It was concluded that ractopamine is efficient in increasing the performance and carcass characteristics of finishing pigs.
