Determination of genetic effects of ATF3 and CDKN1A genes on milk yield and compositions in Chinese Holstein population.

Four SNP, c.*190A > G, c.*326A > G, c.*640G > A, and g.72819977 T > C, were only found evidently associated with the milk traits in the first lactation, and the other two SNPs, c.*321G > C and c.*735 T > C, were markedly associated with at least one milk trait in the second lactation (Table 2 ), however, the allelic effects of these six SNPs showed almostly same directions between the first and second lactations although some associations did not reach statistical significance of 0.05 (Table 2 ).

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