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This study analyzed the demographic and biometric changes in registered animals of the Mangalarga breed over the decades. Information from 206,428 Mangalarga horses born between 1930 and 2018 extracted from the genealogic registry system of the Associação Brasileira de Criadores de Cavalos da Raça Mangalarga was employed. The data referred to sex, birth date, fur coat, breeding site location, score achieved at genealogic registration, and three body measurements. Height at withers and the thoracic and cannon bone circumferences were used to calculate five morphometric indices. Results were submitted to analysis of variance using a completely randomized split-plot design where the plots comprised the sexes and the split-plots comprised the decades of selection. Between 1930 and 1990, genealogic registrations progressively increased, particularly in the 1970s and 80s, when the herd experienced the highest growth rate. In 2018, Mangalarga breeding sites were reported in 23 Brazilian states and the states of São Paulo, Minas Gerais, and Bahia held the largest herds. Between 1970 and 2018, the height at withers of mares, stallions, and geldings increased by 5.1, 3.1, and 2.1 cm, respectively. The thoracic circumference of stallions increased by 3.3 cm and the cannon bone circumference of mares decreased by 0.34 cm. It is concluded that the Mangalarga breed is found across Brazil, especially in the Southeast region. Irrespective of sex, the selection of the breed has led to taller Mangalarga horses. In addition, the stallions became heavier and gained thoracic circumference, while mares became hypometric.

ResumoO gama-orizanol é uma substância natural contida no óleo de arroz, que por suas características hipocolesterolêmicas e antioxidantes, têm sido objeto de estudo em humanos e, mais recentemente, em equinos. Foram utilizados seis garanhões, de várias raças, com idade de 10±5,4 anos e peso inicial de 472,67±90,48 kg. Objetivou-se verificar os efeitos da suplementação da dieta com óleo de arroz semi-refinado, contendo 1,1% de gama-orizanol, sobre os níveis de lipídeos plasmáticos (colesterol total, HDL-C, LDL-C, VLDL-C e triglicérides), de testosterona e da qualidade espermática. Os garanhões foram divididos em dois grupos, recebendo em cada refeição 150 mL de óleo de soja ou de arroz durante 60 dias. Realizaram-se colheitas amostrais de sangue e sêmen a cada 15 dias do período experimental. O delineamento experimental foi inteiramente casualizado, com medidas repetidas no tempo, e as médias comparadas pelo teste F, considerando-se o nível de 5% de significância. Os valores médios de testosterona, colesterol total, HDL-C, LDL-C, VLDL-C e triglicérides foram respectivamente 75,93 ng/dL; 92,73; 61,47; 26,99 e 4,28 mg/dL para o tratamento com óleo de soja; e de 62,13 ng/dL; 110,20; 66,73; 38,44 e 5,02 mg/dL para o tratamento com óleo de arroz. Em relação à qualidade espermática, não foi observada diferença (p<0,05) entre os tratamentos nas variáveis: volume, motilidade, concentração e defeitos. Podemos concluir que a suplementação supracitada não influencia a qualidade espermática nem as concentrações plasmáticas de testosterona, VLDL-C, HDL-C e triglicérides, porém, pode elevar as concentrações plasmáticas de colesterol total e de LDL-C. Palavras-chave:Colesterol. Equinos. Nutrição. Testosterona. AbstractGamma-oryzanol is a natural substance contained in rice bran oil that has been studied for years in humans due to its hypocholeterolemic and antioxidant properties, and in recent years in horses. Using six stallions from different breeds in a randomized experimental design, weighing 472.67±90.48 kg and aging 10±5.4 years, this study was aimed to evaluate the effects of supplementation with rice bran oil containing 1.1% of gamma-oryzanol in plasmatic lipids levels (total cholesterol, HDL-C, LDL-C, VLDL-C and triglycerides), testosterone and sperm quality. Stallions were divided in two groups, one receiving 150 mL of soybean oil, and the other 150 mL of rice bran oil twice a day, during 60 days. Blood and sperm samples were collected every 15 days of the trial period. Data obtained was processed, and means compared using F test, at 5% of confidence level. Mean values of total cholesterol, HDL-C, LDL-C, VLDL-C, triglycerides and testosterone were respectively 92.73; 61.47; 26.99; 4.28 mg/dL and 75.93 ng/dL in the soybean oil supplemented group, and 110.20; 66.73; 38.44; 5.02 mg/dL and 62.13 ng/dL in the rice bran oil one. No difference among treatments (p<0,05) were observed in sperm quality parameters volume, motility, concentration and defects. Supplementation of stallions with rice bran oil containing 1.1% of gam...

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This study aimed to determine the participation frequency and competitive performance of Campolina and Mangalarga Marchador horses in national shows concerning marcha type, sex, and age. To that end, the trial results of national horse shows between 2007 and 2017, comprising 1,781 Campolina and 5,239 Mangalarga Marchador animals, were extracted from the databases of the breeders' associations of each breed. The results regarding participation frequency in these events and the performance achieved by horses were grouped by breed, marcha type, sex, and age group and then subjected to frequency distribution tests. In both breeds, most animals attended only one national show. However, when the specimens were separated by marcha type, sex, and age, it was observed that 54.39% of marcha batida Campolina males competed twice, with greater participation of adult horses (41.41%) than of young ones (22.22%). For Mangalarga Marchador, irrespective of gait type, the proportion of adult horses (67.22%) that competed was higher than that of young ones (25.63%). For marcha picada competitors, the proportion between young (13.97%) and adult (81.91%) was even higher. It was concluded that, over their competitive careers, most horses of either breed attended only one national show, that marcha picada animals usually compete only when adults, and that marcha batida females compete more often when young. In addition, the age group in which competitors achieve their best performances varies according to the specimen.

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