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. 1996 Sep 1;37(3):367–373. doi: 10.1186/BF03548103

A Sperm Midpiece Defect in a Hereford Bull with Variable Semen Quality and Freezability

Mellomstykke-defekt hos spermier fra en Herefordokse med varierende sædkvalitet og spermiefrysbarhet

K Andersen Berg 115,✉, O Filseth 215, E Engeland 315
PMCID: PMC8064003  PMID: 8996882

Abstract

A midpiece sperm defect with a frequency of 25-35% in ejaculates obtained from a Hereford bull with a 60 d non-retum rate of 76.4% after careful pre- and postfreeze semen selection was studied in light microscope and by transmission electron microscopy. The defect consisted in a folding and coiling of the distal midpiece characterized by disorganization and irregularity of mitochondria surrounding the axial fiber bundle, combined with retraction of doublet fibers and dislocation and fracturing of these elements and the corresponding dense fibers. Based on examination of the sper- matogenic epithelium it was concluded that the alterations in the axial fiber bundle were secondary to those in the mitochondrial sheath. The abnormality appeared to be related to the “Dag-like” defect earlier observed in different breeds.

Keywords: bull sperm, ultrastructure, classification, fertility

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