Abstract
The objective of this study was to characterize the genetic variability of Anglo-Nubian goats using microsatellite markers. The study was conducted using herds from four municipalities of Central-Northern Piauí (Teresina, José de Freitas, Campo Maior, and Angical), where technical information is scarce. Seven markers suggested by FAO were used (ILSTS11, McM527, INRA23, ETH10, OarfCB304, OarfCB48, and MAF209). The samples were genotyped using a 7% polyacrylamide gel. The average number of alleles per locus was 4.0, with observed and expected heterozygosity of 0.38 and 0.55, respectively. Few deviations from the Hardy-Weinberg equilibrium were observed for each population. Only two loci deviated significantly in two localities. The coefficient of gene differentiation (GST') indicated that 11.9% of the genetic variation was distributed among populations, and according to the coefficient of inbreeding (GIS = 0.23 and FIS = 0.23), there is a deficiency of heterozygotes within populations. These findings corroborate the Bayesian analyses performed with the STRUCTURE software, which revealed three distinct and moderately structured groups. The graphic analysis showed that Teresina and José de Freitas are isolated groups, while Angical and Campo Maior share most of their alleles. Despite this, the level of diversity among herds was low. Based on this genetic structure, exchange of reproducers among municipalities is recommended for the maintenance of the breed.
Highlights
Goat farming is an activity of great economic and social importance in Brazil
The objective of this study was to characterize the genetic variability of Anglo-Nubian goats using microsatellite markers
The graphic analysis showed that Teresina and José de Freitas are isolated groups, while Angical and Campo Maior share most of their alleles
Summary
Goat farming is an activity of great economic and social importance in Brazil. The northeastern region has the largest goat livestock, representing more than 90% of the national total (IBGE, 2011). Anglo-Nubian goats are adaptable to the semi-arid climate of Northeastern Brazil, with excellent heat tolerance indexes (HTI) (Santos et al, 2005). For these reasons, Anglo-Nubian goats have been increasingly used in Central-Northern Piauí. Its introduction has been carried out indiscriminately and with no technical standards to avoid possible problems associated with genetic erosion and high inbreeding in herds. Studies on this breed have focused mostly on its potentials, such as behavior, adaptation, and production, rather than the genetic structure of populations in areas of occurrence
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
