Six Stud Holstein bulls were selected to study the effect of zinc on semen quality,enzymatie activities,zinc and testosterone concentrations in the serum or seminal plasma.
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- 试验选用6头荷斯坦种公牛,研究了锌对性反射时间、精液品质、精清酶活性及血、精清锌与睾酮浓度的影响。