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Multivariate analysis for characteristics of heat tolerance in horses in Brazil

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Abstract

The environment in which the horse is reared affects its ability to maintain thermal balance which is in turn related to thermal characteristics and regulatory physiological mechanisms. In this study a multivariate analysis of physiological traits in relation to heat tolerance in horses was carried out in the Federal District, Brazil. The aim was to test the ability of these analyses to separate groups of animals and determine which physiological traits are most important in the adaptation to heat stress. Forty adult horses (4 to 13 years) were used, ten from each of four different genetic groups (English thoroughbred, Brazilian showjumper, crossbred and Breton). The traits examined included heart and breathing rate, rectal temperature as well as blood parameters. The data underwent multivariate statistical analysis including cluster, discriminate and canonical using Statistical Analysis System - SAS ® procedures CLUSTER, STEPDISC, CANCORR and DISCRIM. The tree diagram showed clear distances between groups studied and canonical analysis was able to separate individuals in groups. The discriminate analysis identified the variables which were most important in separating these groups. The multivariate analysis was able to separate the animals into groups with RR, HR and RT being important in this separation.

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Acknowledgements

To CNPq and INCT-IGS for research scholarships, as well as FAPDF and FINATEC for financial aid.

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Authors and Affiliations

  1. Escola de Veterinária, Universidade Federal de Goiás, Goiânia, GO, Brazil

    Marlos Castanheira, Aline Landim & Maria Clorinda Soares Fiorvanti

  2. EMBRAPA Recursos Genéticos e Biotecnologia, Brasília, DF, Brazil

    Samuel Rezende Paiva

  3. Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Brasília, DF, Brazil

    Helder Louvandini, Giane Regina Paludo, Bruno Stefano Dallago & Concepta McManus

Authors
  1. Marlos Castanheira
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  2. Samuel Rezende Paiva
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  3. Helder Louvandini
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  4. Aline Landim
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  5. Maria Clorinda Soares Fiorvanti
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  6. Giane Regina Paludo
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  7. Bruno Stefano Dallago
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  8. Concepta McManus
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Correspondence to Concepta McManus.

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Castanheira, M., Rezende Paiva, S., Louvandini, H. et al. Multivariate analysis for characteristics of heat tolerance in horses in Brazil. Trop Anim Health Prod 42, 185–191 (2010). https://doi.org/10.1007/s11250-009-9404-x

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  • DOI: https://doi.org/10.1007/s11250-009-9404-x

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