科研之友
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摘要
The aim of this study was the determination of genetical and environmental factors that affect the occurrence of aberrant spermatozoa. The evaluation comprised 1,543 ejaculates collected from 57 boars representing BHZP 77 (Pietrain line db.77 (R)), German Large White, German Landrace and Pietrain. The morphological investigation was done using standard protocols. Ejaculates were analysed with an optical microscope and abnormal sperm cells were differentiated into varying morphological abnormalities such as abnormal heads, apical ridge defects of the acrosome, abnormal tails and cytoplasmic droplets. The statistical evaluation using the SAS-procedure Glimmix considered the fixed effects breed, age and season besides the random animal effect. A significant effect (p < 0.05) of breed on the elevated occurrence of cytoplasmic droplets was found in German Large White boars. Although there were significant effects (p < 0.05) of the season on each anomality - except for the cytoplasmic droplets - a significant increase of the anomalities during summer did not exist. There was an age dependent effect on all investigated anomalities (p < 0.05). Additionally, the breeding value was calculated for the incidence of individual anomalities. In this context there were clear differences between populations considering the different kinds of anomalities. In total, the data suggest that selection on a reduced number of sperm cell anomalities might lead to an improvement of sperm quality parameters and will therefore enhance boar fertility.
- 出版日期2017-8
