VGO-0219
QUESTION
A sperm defect in bulls in which the main tail piece is strongly coiled over the mid piece giving an impression of short tail and resultant extremely poor sperm motility. This is known as?
OPTIONS
(A) Knobbed sperm
(B) Diadem defect
(C) Dag defect
(D) Cork-screw defect
ANSWER
(C) Dag defect
EXPLANATION
The Dag defect causes severe coiling or folding of the sperm tail and midpiece, sometimes creating an apparent short tail and markedly reducing progressive motility. Knobbed sperm have an acrosomal defect, while the diadem defect involves nuclear vacuoles. Corkscrew defects mainly involve an abnormal mitochondrial sheath. The extensive tail folded over the midpiece specifically favors the Dag defect.
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