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Population structure and genealogical analysis of the Brazilian Crioula Horse

Published online by Cambridge University Press:  03 April 2014

F.C. Maciel ,
C.D. Bertoli ,
J. Braccini Neto ,
J.A. Cobuci ,
S.R. Paiva  and
C.M. McManus
F.C. Maciel
Affiliation:
Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
C.D. Bertoli
Affiliation:
Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
J. Braccini Neto
Affiliation:
Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
J.A. Cobuci
Affiliation:
Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
S.R. Paiva
Affiliation:
EMBRAPA Recursos Genéticos e Biotecnologia, Brasília, DF 70770-970, Brazil
C.M. McManus*
Affiliation:
Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil Universidade de Brasília, Brasília, DF 70910-900, Brazil
*
Correspondence to: C.M. McManus, Universidade de Brasília, Brasília, DF 70910-900, Brazil. email: concepta@unb.br
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Summary

A genealogical analysis of Crioula horses registered by the Brazilian Association of Crioula Horse Breeders was performed. The state of Rio Grande do Sul is the largest producer of animals with 89.85 percent of registered animals, of which 45.29 percent were males and 54.71 percent females. The inbreeding coefficient was calculated at 0.88 percent and the average relatedness was 0.65 percent in the total population (animals born in Brazil and imported). Inbreeding increased over the generations. An increase was seen in the average genetic conservation index in animals born after the year 1927 (0) until 2010 (8.67 percent). The average generation interval was 10.3 years and the average age of parents when offspring born were 10.5 years, falling in recent years. The effective population size of founders was 95.19 animals, the number of ancestors contributing to this population was 5086 where 56 ancestors explained 50 percent of the genetic diversity of the breed. Inbreeding is under control in the Crioula horse. The increase in registrations reflects the increased interest from farmers in this breed.

Résumé

Une analyse généalogique des chevaux Créoles inscrits à l'Association Brésilienne d'Éleveurs de Chevaux Créoles a été réalisée. L'état du Rio Grande do Sul est le plus grand producteur d'animaux avec 89,85 pour cent des animaux inscrits, dont le 45,29 pour cent sont mâles et le 54,71 pour cent femelles. Le coefficient de consanguinité a été estimé à 0,88 pour cent, avec une parenté moyenne de 0,65 pour cent dans la population totale, y compris les animaux nés au Brésil et ceux importés. La consanguinité a augmenté au fil des générations. Un accroissement de l'indice moyen de conservation génétique a été observé pour les animaux nés entre 1927 (0) et 2010 (8,67 pour cent). L'intervalle générationnel moyen a été de 10,3 ans et l'âge auquel les parents ont en moyenne leur premier descendant a été de 10,5 ans, cet âge ayant diminué au cours des dernières années. La taille effective de la population des fondateurs a été de 95,19 animaux. Le nombre d'ancêtres ayant contribué à cette population a été de 5086, dont 56 sont responsables du 50 pour cent de la diversité génétique de la race. La consanguinité est sous contrôle dans la race équine Créole au Brésil. L'augmentation des inscriptions reflète l'intérêt croissant des éleveurs pour cette race.

Resumen

Se realizó un análisis genealógico de los caballos Criollos registrados en la Asociación Brasileña de Criadores de Caballo Criollo. El estado de Río Grande del Sur es el mayor productor de animales con el 89,85 por ciento de los animales registrados, de los cuales el 45,29 por ciento son machos y el 54,71 por ciento hembras. El coeficiente de endogamia se estimó en un 0,88 por ciento, con un parentesco medio de 0,65 por ciento en la población total, contando tanto con animales nacidos en Brasil como con animales importados. La endogamia aumentó de generación en generación. Se detectó un incremento en el índice medio de conservación genética en los animales nacidos entre 1927 (0) y 2010 (8,67 por ciento). El intervalo generacional medio fue de 10,3 años y la edad media de los progenitores al nacimiento del primer descendiente fue de 10,5 años, habiéndose reducido esta edad en los últimos años. El tamaño efectivo de la población de fundadores fue de 95,19 animales. El número de ancestros que han contribuido a esta población fue de 5086, de los cuales 56 eran responsables del 50 por ciento de la diversidad genética de la raza. La endogamia está bajo control en la raza equina Criolla en Brasil. El aumento de registros refleja el interés creciente de los ganaderos por esta raza.

Keywords

average relatednessfoundingancestorsgenetic conservation indexinbreedingstatistics of Wrightconsanguinitéparenté moyenneindice de conservation génétiquestatistiques de Wrightancêtres fondateursgénéalogiecheval créoleBrésilendogamiaparentesco medioíndice de conservación genéticaestadísticos de Wrightancestros fundadoresgenealogíacaballo criolloBrasil
Type
Research Article
Information
Animal Genetic Resources/Resources génétiques animales/Recursos genéticos animales , Volume 54 , June 2014 , pp. 115 - 125
Copyright
Copyright © Food and Agriculture Organization of the United Nations 2014 

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