Least square mean (LSM) and standard error (SE) for semen quality traits of different PLCz haplotype combinations in Chinese Holstein bulls.

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H1 = GT; H2 = GC; H3 = AT; H4 = AC.

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Means in the same column with different lowercase superscripts (a and b) are different at P<0.05; means in the same column with different uppercase superscripts (A and B) are different at P<0.01.