Genetic variability of the Brazilian hair sheep breeds

Pesquisa Agropecuária Brasileira

Samuel Rezende Paiva²  Vanessa Chaves Silvério¹  Andréa Alves Egito²  Concepta Mcmanus¹  Danielle Assis De Faria¹  Arthur Da Silva Mariante²  Sílvia Ribeiro Castro²  Maria Do Socorro Maués Albuquerque²  Jorge Abdala Dergam¹ 

[1] ,Embrapa Recursos Genéticos e BiotecnologiaBrasília DF ,Brazil

关键词: Ovis aries;    conservation genetics;    domestic animal diversity;    molecular markers;    RAPD;    Ovis aries;    genética da conservação;    diversidade de animais domésticos;    marcadores moleculares;    RAPD;   

DOI  :  10.1590/S0100-204X2005000900008

来源: SciELO

【 摘 要 】

The objectives of this work were to investigate the genetic structure of the Brazilian hair sheep breeds and to determine the origin of the Santa Inês breed. Molecular similarity was determined using Randomly Amplified Polymorphic DNA - Polymerase Chain Reaction markers in 238 individuals from five naturalized sheep breeds: Santa Inês (48 animals), Rabo Largo (48), Somali (48), Morada Nova (48) and Bergamasca (46), collected in Goiás, Sergipe, Bahia, and Ceará States as well as in the Federal District. Fifty-four loci were selected from 19 primers, after a pilot test using 140 primers. Qualitative analyses indicate diagnostic markers for all breeds. All breeds were significantly different from each other. Interbreed differences were explained by 14.92% of the total variation. Santa Inês clustered with Bergamasca (97% bootstrap) and with Rabo Largo, composing the third member of the group (81% bootstrap) while Morada Nova and Somali breeds clustered separately. Each breed should be considered as a separate management and conservation unit, and special care should be taken with Rabo Largo, Morada Nova and Somali breeds, represented by small herds in Brazil.

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