2.2. DNA extraction and PCR amplification
DNAwas extracted using standard SDS lysis, proteinase K digestion, phenol/
chloroform extraction, and ethanol precipitation [19]. DNA samples were resuspended
in TE buffer (10 mmolÆL1 Tris-HCl, 1 mmolÆL1 EDTA, pH = 8) and
stored at 20 C.
Twelve bovine microsatellite markers were selected from the CaDBase
database on Genetic Diversity in Cattle (http://www.projects.roslin.ac.uk/cdiv/
markers.html) and the USDA Cattle Genome Mapping Project (http://
www.marc.usda.gov/genome/cattle/cattle.html).