Section A: Polymorphism and Biodiversity
Genetic structure of hair sheep breeds in Brazil by microsatellites markers
SAMUEL R. PAIVA1, DANIELLE A. FARIA2, JORGE DERGAM3, CONCEPTA
McMANUS4, SIMONE E.F.GUIMARÃES3, ANDREA A. EGITO1, MARIA SOCORRO M.
ALBUQUERQUE1, SILVIA T. R. CASTRO1, ARTHUR S. MARIANTE1
1
Embrapa Recursos Genéticos e Biotecnologia, Brasília-DF, Brasil
Universidade Católica de Brasília, Brasília-DF, Brasil
3
Universidade Federal de Viçosa, Viçosa-MG, Brazil
4
Universidade de Brasília, Brasília-DF, Brasil
E-mail: [email protected]
2
The objective of this work was to characterize the genetic structure within and among ten
naturalized and commercial sheep breeds in Brazil, using 19 microsatellite loci. The analyses
included 383 individuals using data from loci INRA23, OarFCB304, MAF214, INRA63,
OarHH35, INRA35, OMHC1, OarFCB48, ILSTS87, ILSTS05, ILSTS11, MAF65, BM827,
OarfCB20, OarAE129, INRA05, INRA172, HUJ616, SRCRS05, and BM62526. The
AMOVA analysis indicated that 11.76% (p<0.001) of total variation occurred among breeds.
A Bayesian analysis conducted with the Structure software (1,000 iterations for a tested K
value) suggested that only the naturalized breeds Santa Inês and Morada Nova showed
significant substructuring. In the Santa Inês breed, samples from DF, GO and SE states
(central-western and northeastern Brazil) clustered separately from the samples from MA and
CE states (northeastern Brazil). This pattern is consistent with the “Old” vs. “New” Santa
Inês breeds. In the Morada Nova, substructuring occurred between the red and the white
varieties of fur color. Since the two populations effective numbers of Morada Nova herds are
low, this pattern may be explained by directional selection and random loss of alleles. These
results allowed for a better understanding of the distribution of genetic variability among
Brazilian sheep and for its application on management and conservation programs of
naturalized sheep in Brazil.
Proceedings of the 30th International Conference on Animal Genetics, 2006, Porto Seguro,
Brazil. Belo Horizonte, Brazil: CBRA, 2006. ISBN 85-85584-03-3 (CD); 85-85584-02-5 (site
www.cbra.org.br)