Evaluation of conservation program for the Pantaneiro horse in Brazil

Revista Brasileira de Zootecnia

Abreu, Urbano Gomes Pinto de³  Dallago, Bruno Stéfano Lima²  Santos, Sandra Aparecida³  McManus, Concepta²  Paiva, Samuel Rezende⁴  Martins, Rafhael Felipe Saraiva²  Marques, Pedro Rocha¹  Braccini Neto, José¹ 

[1] Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil;Universidade de Brasília, Brasília, Brazil;EMBRAPA Pantanal, Corumbá, Brazil;EMBRAPA Recursos Genéticos e Biotecnologia, Brasília, Brazil

关键词: average relatedness;    effective population size;    farm;    inbreeding;    municipality;    Wright's statistics    Introduction The Pantanal occupies 250;    000 km2;    of which 138;    183 km2 are in Midwest Brazil (1;   

DOI  :  10.1590/S1516-35982013000600004

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

A genealogical analysis of registered Pantaneiro horses was carried out with 3647 males and 6794 females. Of these animals, 50.66% had identified sires and 48.86% identified dams. The number of pedigrees increased over the generations, with higher registration of parents of sires than dams. Two municipalities are responsible for almost 70% of all registers: i) Poconé (Mato Grosso State), where the headquarters of the breeders association is located and ii) Corumbá (Mato Grosso do Sul State), where EMBRAPA Pantanal conducts its research. The mean inbreeding was 0.04% and average relatedness was 0.13%. Mean generation interval was 8.20 years. There is moderate to high genetic differentiation between farms (15% of total genetic variation) while between municipalities there is little differentiation. Wright's fixation statistics were calculated and FIS (inbreeding coefficient of individuals relative to the subpopulation) values indicate some heterozygosity between farms but not municipalities, with overall FIT (inbreeding coefficient of individuals relative to the total population) close to zero. The municipalities with the highest number of animals (Poconé and Corumbá) import relatively fewer sires (45 and 67% respectively). Genetic indices from genealogical data on the Pantaneiro horse population show that inbreeding is under control.Future breeding plans should include germplasm exchange between municipalities. The conservation program for the Pantaneiro horse has been shown to be successful but careful planning is needed in the future to avoid inbreeding and changes in important breed traits given the increasing interest in the use of the breed in sporting competitions.  

【 授权许可】

CC BY-NC