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The aim of this study was to investigate the association between genotypes and haplotypes of  OPN,  and milk composition in dairy cows. A total of 317 Chinese Holstein cows were genotyped via DNA sequencing in this study. Three single nucleotide polymorphisms (SNPs), g.2916G &gt; A, g.58675C &gt; T and g.58899C &gt; A, and eight haplotypes were identified. Of the eight possible haplotypes, four haplotypes i.e., Hap2 (ACC; 55.30%), Hap6 (GCC, 15.6%), Hap1 (ACA, 13.6%) and Hap4 (ATC, 5.70%), were considered to be major with a cumulative estimated frequency of &gt;90%. Single markers (g.2916G &gt; A and g.58899C &gt; A) and Haplotype Hap6/4 were found to be associated with an increase in butter-fat percentage ( p  &lt; 0.05). Taken together, our results provided evidence that polymorphisms in  OPN  are associated with milk composition, and could potentially be used for marker-assisted selection in Chinese Holstein cows.

Genetic variation in the OPN gene affects milk composition in Chinese Holstein cows