RESUMO -Objetivou-se, com este trabalho, avaliar as relações entre medidas lineares de eqüinos em crescimento, do nascimento aos doze meses, e de animais adultos da raça Mangalarga Marchador. As medidas utilizadas foram peso corporal e medidas de altura, de comprimento, de largura e de perímetro dos animais. Morphometric Evaluation of Mangalarga Marchador Horse: Conformation Index and Body ProportionsABSTRACT -This work aims to evaluate the relationships between body measures of foals from birth to twelve months of age and mature animals of Mangalarga Marchador breed. Measures were body weight and measures of height, length, width, girth of animals. Corporal Index (CI), Meloscopic Index (MI), Dactilo-thoracic Index (DTI) and Weigth in Cannon Index (WCI) were used to evaluate the relationship between measures. The Eclectic System of Linear Proportions was used to evaluation the proportions between linear measures and head length. Colts and fillies were classified as small shape at birth, because the CI were 81.36 and 82.33, respectively. Colts and fillies with four months of age, already presented CI higher than 85.0, and were classified as medium shape. Stallions and mares were classified as medium shape, with CI of 87.17 and 85.18, respectively. Considering the MI, colts and fillies were classified as large shape at birth, changing to medium shape with increase of age and stallions and mares were classified as medium shape. The DTI classified the colts and fillies as hipermetric animals because presented values above 10.8. The WCI ranged from 26.18 to 6.60 for fillies and from 25.93 to 7.04 for colts, while for stallions and mares were 4.16 and 4.96, respectively. Linear measures with greater rates of growth than the head length presented increase of the proportions from birth to adult age, while the measures of smaller rates of growth than the head length presented reverse behavior.

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RESUMO -Objetivou-se com o presente trabalho avaliar o crescimento de potros da raça Mangalarga Marchador por meio de suas medidas lineares. Foram mensurados 98 potros, sendo 55 machos e 43 fêmeas, ao nascimento e a cada 30 dias até completarem 12 meses de idade. Os pais e as mães dos potros foram mensurados para obtenção dos valores médios das medidas lineares estudadas nos animais adultos. Os valores das medidas corporais dos animais foram submetidos à análise de variância e o modelo estatístico incluiu os efeitos de sexo, local, manejo nutricional, rebanho, mês e ano de nascimento. As características de conformação estudadas não foram influenciadas pelos efeitos de sexo, rebanho, região, manejo nutricional, mês e ano de nascimento. A medida de altura na cernelha apresentou reduzida variação, passando de 61,6% da média à idade adulta, ao nascimento, para 88% da média à idade adulta, aos 12 meses, nos machos, e de 63,2% da média à idade adulta, ao nascimento, para 90% da média à idade adulta, aos 12 meses, nas fêmeas. De forma similar, a altura na garupa passou de 63,3% da média à idade adulta, ao nascimento, para 89% da média à idade adulta, aos 12 meses, nos machos e de 64,1% da média à idade adulta, ao nascimento, para 91,1% da média à idade adulta, aos 12 meses, nas fêmeas. O comprimento do corpo dos potros apresentou valores de 68,1; 112,6 e 127,1 cm nos machos e de 68; 111,6 e 128,3 cm nas fêmeas, ao nascimento, 6 e 12 meses, respectivamente. Em relação à idade adulta, os valores observados para comprimento do corpo foram 43,3; 71,6 e 86,6%, nos machos, e 45,5; 74,7 e 85,8%, nas fêmeas, ao nascimento, 6 e 12 meses de idade, respectivamente. Palavras-chave: crescimento, mensuração, potros Morphometric Evaluation of Mangalarga Marchador Horses: Linear MeasuresABSTRACT -The present work aimed to evaluate foals growth of the Mangalarga Marchador breed, by linear measures. Ninetyeight foals, 55 males and 43 females were measured at birth and at each 30 days up to 12 months age. Results of body measures were submitted to analysis of variance and statistical model includes effects of sex, local, nutritional management, herd, month and year of birth. Conformation characteristics studied were not influenced by the effects of sex, herd, nutritional management, month and year of birth. In relation to height in the withers and in the hip measures, it was observed small variation, from 61.6 and 63.3% of mature age, at birth, from 88 to 89% of mature age, at 12 th month of age, for males and from 63.2 and 64.1% of mature age, at birth, from 90.0 to 91.1% of mature age, at 12 th month of age, for females. Values of body length of foals were of 68.1, 112.6 and 127.1 cm for males and 68.0, 111.6 and 128.3 cm, for females, at birth, 6 th month and 12 th month of age, respectively. In relation to mature age, the observed values of body length were 43.3, 71.6 and 86.6%, for males and 45.5, 74.7 and 85.8%, for females, at birth, 6 th month and 12 th month of age, respectively.

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