ABSTRACT

Tropical ewes of the Morada Nova breed were used to evaluate concordance on the effects of body condition score (BCS) and age classification using canonical discriminant analysis (CDA) as the classification method. The dependent variables in this study were: physiological responses, thyroid hormones, hematological and biochemical parameters. The hypothesis of this study was that the effect of BCS and age classification of the ewes might explain changes in physiological responses, thyroid hormones, hematological and serum biochemical parameters; however, very little effect was observed. Only the physiological responses and the thyroid hormones presented a subtle change using the BCS classification effect. An elevated error rate with both effects was observed, especially for age. However, the lowest total error rate was detected when all variables for BCS and for the thyroid hormones according to chronological age were used in the analyses. Therefore, the results do not support the recommendation of using BCS and age as classification effects, and therefore other effects should be used to improve reference ranges.

摘要

Morada Nova 的热带母羊使用规范判别分析 (CDA) 作为分类方法，使用品种来评估身体状况评分 (BCS) 和年龄分类效果的一致性。本研究中的因变量是：生理反应、甲状腺激素、血液学和生化参数。本研究的假设是母羊 BCS 和年龄分类的影响可能解释生理反应、甲状腺激素、血液学和血清生化参数的变化；然而，观察到的影响很小。使用 BCS 分类效应，只有生理反应和甲状腺激素呈现出微妙的变化。观察到两种影响的错误率都升高，尤其是年龄。然而，当在分析中使用 BCS 和根据实际年龄的甲状腺激素的所有变量时，检测到的总错误率最低。因此，结果不支持使用 BCS 和年龄作为分类效应的建议，因此应使用其他效应来改善参考范围。