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A decapitated sperm defect in two sterile Hereford bulls
Nordisk Veterinaermedicin
|March 1, 1977
Summary
Sterility in Hereford bulls was studied. Most sperm had separated heads and tails, with tails showing movement, resembling a known defect in Guernsey cattle.
Area of Science:
- Veterinary Science
- Animal Reproduction
- Genetics
Background:
- Investigated two cases of sterility in young Hereford bulls.
- Observed abnormal sperm morphology in semen samples.
Purpose of the Study:
- Characterize the specific sperm defect causing sterility.
- Compare findings to similar defects in other breeds.
- Discuss the potential hereditary basis of the condition.
Main Methods:
- Semen analysis of affected bulls.
- Microscopic examination of sperm morphology.
- Comparison with known genetic defects in cattle.
Main Results:
- 80-95% of sperm showed head-tail separation.
- Loose tails exhibited active movement.
- Proximal tail bending around the cytoplasmic droplet was observed.
Conclusions:
- The observed defect shares similarities with the 'decapitated sperm defect' in Guernsey bulls.
- The condition may have a hereditary component.
- Further investigation into the genetic basis is warranted.