Abstract
ABSTRACT: The Mangalarga Marchador breed accounts for the largest horse herd in Brazil and has been experiencing national and international expansion. Nevertheless, there is little scientific production on the evolution of this breed and there are no studies on the morphometric transformations that took place during its formation. In this context, the present study aimed to assess the evolution in morphometric measures of the Mangalarga Marchador breed between 1970 and 2010. The research used information archived at the Brazilian Association of Mangalarga Marchador Breeders from 23,148 males and 92,980 females in a completely randomized experimental design. The six treatments consisted of the animals measured between 1970 and 1979, 1980 and 1989, 1990 and 1994, 1995 and 1999, 2000 and 2004, and 2005 and 2010, respectively. The measures assessed were: height at withers and croup, length of the head, neck, back, croup, shoulder, and body, width of the head and croup, thoracic circumference, and cannon circumference Over the period analyzed, males and females experienced a reduction in thoracic circumference, in the lengths of the head, back, croup, and shoulder, and in the widths of the head and croup. In the males, neck length and cannon circumference also decreased, while body length increased in females. Over time, breed selection led to smaller head, higher stature, and shorter trunk length. However, important measures for the breed's functionality, such as shoulder length and thoracic circumference, decreased.
Highlights
Mangalarga Marchador is a Brazilian breed with approximately 200 years of breeding (CASIUCH, 1997) and accounts for the largest and most representative horse herd in the country (LIMA, 2006)
A difference (p
Barbosa (1993) and Zamborlini et al (1996) described head length of 58.0 cm and, more recently, in a report published by the ABCCMM in the first attempt to propose an ideal model for the breed (ABCCMM, 2005), head length was 57.0 cm, which is similar to the average over the period assessed in the present study between 2005 and 2010
Summary
Mangalarga Marchador is a Brazilian breed with approximately 200 years of breeding (CASIUCH, 1997) and accounts for the largest and most representative horse herd in the country (LIMA, 2006). The Mangalarga Marchador breed represents one of the largest horse herds worldwide, there is still little scientific production on the different aspects of this breed and no study has been carried out on the morphometric transformations that took place over time. In this context, the present study aimed to assess the evolution of the morphometric measures of the Mangalarga Marchador breed between 1970 and 2010
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