Avaliação das características da carcaça de cordeiros não castrados Dorper x Santa Inês terminados em diferentes sistemas de produção

Abstract

The evaluation of the sheep carcass is necessary so that improvements can be made in the production chain, in the quality and standardization of the product. The objective of this study was to evaluate the quantitative and qualitative characteristics of the carcass of not castrated lambs of the Dorper x Santa Inês breed, finishing in a confinement system, unshaded aruana pasture and shaded aruana pasture (silvipastoril). The experiment was carried out at the Ovinocultura Sector of the Federal Technological University of Paraná (UTFPR), Campus Dois Vizinhos. Twenty-four Dorper x Santa Inês lambs, not castrated, were also distributed in three treatments: PSSSupl: tropical pasture without shade + supplementation (n = 8); PCSSupl: tropical pasture with natural shade (silvipastoril) + supplementation (n = 8); and Conf: confinement in stall (n = 8). The lambs were slaughtered at the pre-determined weight of 40 kg. Data were analyzed by ANOVA and Tukey test at 5% probability. The lambs presented no significant difference for the age of slaughter or for the period of finishing of the lambs. However, there was a statistical difference of confinement system compared to the pasture system with and without shading for cold carcass weight (18.29 kg), cold carcass yield (46.82%), empty body weight (37.08 kg) and carcass compactnessindex (0.25 kg) / cm). Although, the weight alive of slaughter and loin eye area presented statistical difference of the lambs in confinement when compared to the data obtained in the pasture without shading, different from the length internal of carcass that differed from the confined animals in relation to the silvipastoril system. In the subjective evaluations of the lamb carcass, there was a significant difference of the confinement compared to the pasture systems with and without shading for fat color (2,14) and fat consistency (1,93), but the fat cover (2,71) presented a significant difference of confinement in relation to the silvipastoril system. Objective and subjective evaluations of carcasses of crossbred lambs presented better indexes in confined lambs when compared to pasture animals with and without shading, possibly due to feeding.