Seasonal occurrence of pathological sperms in bulls
1996
Massanyi, P. | Lukac, N. | Massanyiova, K. (Vysoka Skola Polnohospodarska, Nitra (Slovakia))
The development of pathological bull sperms in relation to season was investigated. Sixty ejaculate samples from 15 bulls were analysed morphologically, making altogether 24,000 sperms evaluated in four periods over one year (spring, summer, autumn, winter). The average occurrence of pathologically altered sperms was 5.88 %. Changes on the head reached 21.89 % of all pathological sperms, accounting for 1.28 % of the total. 16.18 % of head changes were on the acrosome, accounting for 3.54 % of all abnormalities and 0.21 % of all tested sperms. The set of changes on the tail reached on average 59.11 %, or 3.47 % of total. The most usual change was decapitation which on average occurred in 18.99 % of all changes during the year and 1.11 % of all evaluated sperms. The highest occurrence of pathological sperms was in the spring (6.73 %). Most changes on the tail (64.52 %) and also the highest number of decapitated sperms (20.25 %) were reported in summer. There was a decrease of pathological sperms in winter (5.20 %), but in this period a higher occurrence of head changes (24.67 %) is evident. Temperatures in the region ranged from -2.3 deg C to 20.73 deg C. The correlation between temperature and number of pathological sperms during the year showed that under our conditions, season did not have an expressive influence on occurrence of pathological changes.
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