Comparison of DNA and amplicon concentration among DNA extraction protocols using different milk sample fractions (whole milk, fat, fat + pellet, and pellet) according to milk-health status groups (healthy or mastitis caused by <i>Escherichia coli</i>, <i>Klebsiella</i> spp., <i>Streptococcus</i> spp., and all groups combined) and two different DNA extraction kits.

Numbers in parentheses represent the standard error of the mean.