Effectiveness of the morphofunctional evaluation method of Campolina and Mangalarga Marchador breeds

ABSTRACT This study aimed to verify whether the criterion of exhibition contests adopted for Campolina and Mangalarga Marchador breeds has been successful in recent years, i.e., if the subsequent generations have the morphology recommended by the standard of the breed allied with high-quality marcha, a four-beat ambling gait. The classifications achieved by each horse during national horse shows in morphology and gait contests underwent Spearman's correlation to verify the number of contests with a correlation between the classifications in the two judgments and those with no correlation. Next, the number of contests with or without such correlation underwent a frequency distribution test considering the variables breed, year, age, marcha category, and sex. Spearman's correlation coefficient (r) of contests with a correlation was also used as a parameter. A difference was observed among years of evaluation only for Mangalarga Marchador horses, with a greater number of contests with correlations between morphological and ambling gait performances between 1998 and 2004. On both breeds, the correlation was found in more contests among foals than adult horses. When Spearman's correlation coefficients were compared, Campolina contests exhibited a higher r than Mangalarga Marchador, 68.14 and 63.68%, respectively. Only Mangalarga Marchador males had higher r value than females, 67.27 and 59.73%, respectively. The contest criterion adopted by Campolina and Mangalarga Marchador associations to select superior individuals does not correlate, in subsequent generations, with the morphology recommended by the standard of the breeds with high-quality marcha progress in the same individuals.摘要 本研究旨在验证近年来针对卡波利纳马（Campolina）与曼加尔加马查多马（Mangalarga Marchador）所采用的展示赛事评选标准是否成效显著，即后续代次的马匹是否兼具品种标准推荐的体型形态与高品质曼加尔加步态（marcha，一种四节拍溜步步态）。针对每匹马在全国性马匹赛事的体型评分与步态评分结果开展斯皮尔曼相关性分析，以统计两类赛事的占比：一类为两项评分存在相关性的赛事，另一类则为无相关性的赛事。随后，以品种、年份、年龄、曼加尔加步态组别以及性别为变量，对存在或不存在相关性的赛事数量开展频次分布检验。本研究同时将存在相关性赛事的斯皮尔曼相关系数（r）作为评估参数。仅在曼加尔加马查多马的评估年份中发现显著差异：1998年至2004年间，体型表现与溜步步态表现存在相关性的赛事数量更多。在两个品种中，幼驹组赛事的评分相关性占比均高于成年马组。对比斯皮尔曼相关系数可见，卡波利纳马赛事的平均相关系数高于曼加尔加马查多马，分别为68.14%与63.68%。仅曼加尔加马查多马的公马相关系数高于母马，分别为67.27%与59.73%。卡波利纳马与曼加尔加马查多马协会用于选拔优秀个体的赛事评选标准，在后续代次中并未与同一匹马兼具品种标准推荐体型与高品质曼加尔加步态的表现形成相关性。