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Semen from bulls with significant scrotal or testicular pathology generally does not meet the minimum 70% morphologically normal sperm of which more than 30% are progressively motile, and these bulls are thus considered subfertile. The temporal appearance of sperm abnormalities following scrotal insulation has been established in bulls and may be useful in determining the chronicity of an insult [2, 8, 9]. Semen evaluation may also be used to determine when surgical intervention should be pursued in bulls with unilateral testicular disease.