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International projections point to the growth in global production of sheep meat, mainly from developing countries. However, the exigencies of consumers on characterization of production systems, nutritional information, and sensorial analysis to target the preferences must be answered. The aim of this study was to characterize the meat quality and the global acceptance of Brazilian native ovine breeds and their crosses, and discuss these aspects on the current basis of human health and wellbeing. Three native breeds (Morada Nova, Rabo Largo, and Santa Inês) that were managed in semi-intensive systems and raised in semi-arid Brazilian regions were used. Chemical composition and fatty acid analysis, sensory evaluation and health indices were accessed. The combined effects of breed, sex and breed by sex interaction produced differentiation in meat fatty acid (FA) profiles. The cholesterol contents ranged between 51 and 59.1 mg/100 g. The Morada Nova lambs showed the lowest lipid content (1.93%). The Morada Nova x Rabo Largo crossbreed breed has the potential to increase the content of conjugated linoleic acid. The high content of α-linolenic acid, which is considered hypocholesterolemic, was responsible for better health indices. The moderate acceptability obtained in sensory traits is compatible with the requirements of the consumer market. The combination of nutritional and sensory traits associated with human health and wellbeing that is presented by these native ovine breeds qualifies them as a good choice of red meat to be included in a larger proportion in human food. Keywords: fatty acids, healthier meat, semi-arid region, sheep

RESUMOO objetivo do presente trabalho foi avaliar a qualidade e estimar a repetibilidade das características físicas e morfológicas do sêmen de garanhões da raça Mangalarga Marchador assim como a fertilidade dos animais durante e fora da estação reprodutiva na região norte do estado do Rio de Janeiro. Foi coletado o sêmen de garanhões da raça Mangalarga Marchador, jovens (≤ 4 anos) e adultos (≥ 5 anos). Foi avaliado o pH, volume seminal, motilidade, vigor, concentração espermática, número total de espermatozoides (NTSTZ), defeitos espermáticos e fertilidade. Não foram verificadas variações entre a categoria de idade e estação reprodutiva na maioria das características físicas do sêmen dos garanhões. No entanto, houve variação da quantidade de defeitos espermáticos entre estações, em que durante a estação reprodutiva foi observado mais defeitos espermáticos em comparação com o período fora da estação reprodutiva. Em relação à fertilidade foi observado 60% de recuperação embrionária e após a transferência de embrião, foi observado 57,8% de prenhes. Conclui-se que os sêmens desses garanhões poderão ser coletados e utilizados sem grandes alterações na sua qualidade, durante e fora da estação reprodutiva, proporcionando a otimização da utilização do material genético de animais geneticamente superiores. Palavras-chave: equinos, andrologia, qualidade seminal Repeatability of the seminal and spermatozoa traits and fertility evaluation of stallions ABSTRACTThe aim of this study was to evaluate seminal and spermatozoa quality of stallions from North of Rio de Janeiro State in the breeding season and non-breeding season. Semen was collected from Mangalarga Marchador stallions, young (≤ 4 years) and adults (≥ 5 years). It was evaluated the pH, seminal volume, motility, vigor, concentration, the total number of spermatozoa, spermatozoa defects, and fertility. There was no variation between age category and breeding seasons in most of the traits. Although, there was a variation on spermatozoa defects between seasons, in that during breeding season we could observe more defects. Regarding the fertility, it was observed 60% of embryio recovery and 57.8% of pregnancy after embryo transfer. Concluding that one can collect and used the semen of these stallions for insemination in both breeding season without changing the quality, optimize the using of the genetic of the stallions.

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Relación entre testosterona sérica, producción espermática y características testiculares con la fertilidad en sementales Mangalarga Marchador Relação entre testosterona sérica, produção espermática e características testiculares com fertilidade em garanhões Mangalarga MarchadorAbstract Background: Assessing breeding soundness is important to predict the potential fertility of stallions. Objective: To investigate the association of testis traits, total number of spermatozoa, and testosterone with fertility of Mangalarga Marchador breed stallions. Methods: The traits measured were testicular length, width and height, right and left testicular volume and total testicular volume. We also evaluated the total number of spermatozoa (TNS), serum testosterone concentration and fertility of stallions (by embryo recovery from donor mares) in the breeding and non-breeding seasons during 1 year. Analysis of variance was performed to verify the effects of age category (AC; young/adult) and reproductive season on the traits. Correlations and repeatability of the traits were also calculated. Results: The AC did not influence testis traits (p>0.05). Reproduction season affected left testicular length, left testicular height, right testicular width and height (p<0.05). The AC and season affected testis volume (p<0.05). There were no effects of AC and season on TNS and testosterone (p>0.05). We observed strong correlations between all testicular measurements and testicular volume (0.53 to 0.75), medium correlation between TNS and testis volume (0.32), and low correlation between testosterone and testis traits (0.20). Repeatability of the characteristics of left and right testis was medium to high (0.22 to 0.78). Embryo recovery rate was 60% and its correlation with TNS was 0.44. Conclusion: Testis size evaluation is recommended over the 37 Rev Colomb Cienc Pecu 2018; 31(1):36-44Rua MA et al. Testis traits and stallion fertiliy evaluation of serum testosterone concentration to predict sperm output. Sperm output (TNS) is a good predictor of stallion fertility. ResumenAntecedentes: Es importante realizar examen andrológico de sementales para predecir su potencial reproductivo. Objetivo: Evaluar la asociación entre características testiculares, número total de espermatozoides y testosterona con la fertilidad de sementales de raza Mangalarga Marchador. Métodos: Las características medidas fueron: longitud testicular, ancho y altura del testículo. También fue calculado el volumen testicular derecho, izquierdo y total, así como el número total de espermatozoides (TNS), concentración sérica de testosterona y fertilidad (por recuperación embrionaria de las yeguas) de los sementales dentro y fuera de la temporada reproductiva durante un año. Se realizó análisis de varianza para evaluar el efecto de categoría de edad (AC) y estación reproductiva sobre las características. Resultados: La AC no influenció las características testiculares (p>0,05). La estación reproductiva influenció la longitud del testículo izquierdo, la altura del testículo ...