The diadem/crater defect was studied over several months in two related 20-month-old Angus bulls. In bull 1, diadem/crater defects were present in 2-99% of ejaculated spermatozoa at various times during the evaluation period. In bull 2, affected cells varied from 20% to 94%, with other abnormalities (head and acrosome defects, coiled tails, proximal… (More)
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