Heritability estimates for biometric measures of the Pantaneiro horse

• Autores: José A. Silva, J. R. B. Sereno, M. G. Miserani, C. McManus, A. S. Mariante, S. A. Santos, U. G. P. Abreu, M. C. M. Mazza
• Localización: Archivos de zootecnia, ISSN-e 1885-4494, ISSN 0004-0592, Vol. 51, Nº 193-194, 2002
• Idioma: inglés
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• Resumen

  • This study used data registered in the Brazilian Pantaneiro Horse Association, in the period of 1972 to 2000. Fifteen linear biometric measures taken at registration (Wither height, back height, croup height, midback height, head length, neck length, backloin length, croup length, shoulder bone length, head width, chest width, hip width, shin bone perimeter and thorax perimeter), on 2248 registered animals were analyzed using the MTDFREML program to estimate genetic and phenotypic variances as well as hertabilities, genetic and phenotypic correlation between the traits of interest. The factors sex, month, year of register and age were fitted as fixed effects in the model. In general the coefficient of variation for these traits was low (2 to 8 percent) which may indicate selection problems in the future. The heritabilities evaluated lay between 0.27 (head width) and 0.83 (thorax perimeter). The inbreeding coefficient was in general low with a mean level of 8 percent, for the animals that showed inbreeeding (1 percent). The genetic correlations were high between all 15 linear biometric measures, except for traits that correlation with the thorax perimeter that were low and sometimes negative.