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The use of lambs from crossing of local with specialized sheep breeds for meat production may lead to higher meat deposition and a smaller fat amount in the carcass, with a more adequate nutritional profile for human consumption. This study investigated the performance, carcass and meat characteristics of lambs from the Morada Nova and Santa Inês locally adapted hair breeds and crosses between Dorper × Morada Nova and Dorper × Santa Inês slaughtered at approximately 35 kg. Morada Nova lambs showed lower (p < 0.05) performance compared to the other genetic groups resulting in a higher age at slaughter (p < 0.05). Crossbred Dorper × Santa Inês and Dorper × Morada Nova lambs showed better characteristics for meat production with better (p < 0.05) conformation as well as leg and carcass compacteness index. Dorper × Santa Inês have a fatty acid profile that is more suitable for human consumption than Dorper × Morada Nova lambs do (p < 0.05); however, both had lower (p < 0.05) intramuscular lipid content (as measured by ether extract levels from Longíssimus lumborum) compared with purebred lambs. Therefore, when the objective is to obtain lean meat, with improved nutritional profile to reduce risks of cardiovascular disease, the use of breeds and crosses that reduce animal slaughter age, such as the ½ Dorper × ½ Santa Inês crossbred, is an interesting alternative.

The replacement of diet soybean meal protein with crambe cake protein (0%, 22%, 44% and 66%) was investigated to evaluate the effect on lamb performance and meat quality, as well as the extent to which erucic acid was incorporated into the meat. The inclusion of increasing levels of crambe cake resulted in poorer lamb performance, as demonstrated by a linear decrease in final liveweight and carcass weight. There was also an increase in plasma blood concentrations of aspartate transaminase and alanine transaminase, indicating hepatic injury. Reduced ether extract concentration of meat was observed, leading to higher shear-force values and a linear decrease in meat luminosity. The fatty acid profile of meat was drastically modified, presenting a reduction in total saturated and polyunsaturated fatty acid concentrations, particularly in the concentration of α-linoleic acid. Additionally, the total monounsaturated fatty acid concentration in meat decreased, while the concentration of erucic acid increased from 0.11% of total fatty acids in Longissimus lumborum samples from lambs fed diets with no inclusion of crambe cake, to 3.70%, 5.82% and 8.04% of total fatty acids in those from lambs fed diets where 22%, 44% and 66%, respectively, of the soybean meal protein was replaced with crambe cake protein. Therefore, the concentration of erucic acid in fatty acid profile of meat was higher than concentration deemed safe for human consumption.

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RESUMO.Várias técnicas são utilizadas para avaliação da carcaça ovina, com objetivo de avaliar os animais destinados ao abate ou seleção de animais com características de deposição e crescimento tecidual que melhor representem o mercado consumidor. Técnicas como avaliação do ganho de peso, do escore corporal e da ultrassonografia de carcaça são largamente utilizadas na rotina de produção; porém são técnicas sujeitas a muitas variações dependendo dos técnicos que as apliquem, e muitas vezes não apresentam resultados tão exatos como outros métodos mais tecnológicos. O uso da tomografia computadorizada com esse fim ainda está em desenvolvimento no mundo, sendo uma ferramenta altamente precisa para avaliação do crescimento e dos componentes de carcaça de ovinos. Por ser uma análise não invasiva e extremamente acurada, pode apresentar uma importante opção frente aos outros métodos rotineiramente utilizados.Palavras chave: área de olho de lombo, imagem por tomografia, ovinos Lamb carcass evaluation by computed tomography: State of the art in Brazil and in the world ABSTRACT. Different techniques has been used to evaluate the lamb carcass, aiming to slaughter or animal's selection with deposition and tissue growth traits, most preferred by consumer market. The evaluation of the weight gain, body condition score and carcass ultrasound are widely used in production routine , but this techniques are subjective and to many variations occurs depending on who apply them, often do not show accurate results as other more technology methods. The computed tomography scans (CT) for this purpose is still in progress around the world, being a precise tool for evaluating the growth and sheep carcass components. It is a non-invasive and highly accurate analysis, can provide an important option compared to the other methods routinely used.Keywords: rib eye area, sheep, topographic image Evaluación de la canal ovina por tomografía computadorizada: Estado del arte en Brasil y en el mundo RESUMO. Varias técnicas son utilizadas para la evaluación de la canal ovina, con objetivo de evaluar los animales destinados al sacrificio o selección de animales con características de deposición y crecimiento de tejido que represente mejor el mercado consumidor. Técnicas como evaluación de la ganancia de peso, de clasificación corporal y de

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Several techniques have been used to evaluate, typify and classify carcasses of animals of zootechnical interest with the purpose of select animals with desirable traits or evaluate the products resulting from slaughtered animals. The older and most common methods that have been used are more practical and less accurate, such as body weight or body condition scoring. However, techniques such as ultrasonography, computed tomography, video image analysis and electromagnetic scanning enable faster and more accurate evaluations, representing an important progress for producers and for the meat industry.