engleski

Relationships between semen quality and growth traits of young Simmental bulls

The semen characteristics and relationshipa with body weight, daily gain and body frame score in Simmental bulls were investigated using data from performance test. Data included record on 309 bulls at the age of 365 days Least squares analysis of variance showed a significant effect of year of birth on ejaculate volume, concentration and motility of spermatozoa. Season of birth significantly affects the ejaculate volume and motility of spermatozoa. The classes of bulls according to body weight(model 1), daily gain (model 2) and body frame score (model 3)significantly contributed to explanation of variability of ejaculate volume, concentration and motility of spermatozoa. The shares of explained variance obtained by model 3 were 24.4 per cent, 15.9 per cent, 7.6 per cent and 22.9 per cent for ejaculate volume, concentration, motility, pathological forms and survival of spermatozoa, respectively. These values were lower by model 1 or 2. There were moderate but significant and positive correlations found for body weight, daily gain and the body frame score with volume (r = from 0.22 to 0.24), concentration (r=from 0.26 to 0.28) and motility (r=from 0.21 to 0.23). The same relations were not found to be statisticaly significant for pathological forms of spermatozoa (r=from -0.08 to -0.03). The percentage of survival of spermatozoa after thawing was in significant correlation only with body frame score.

Simmental bulls ; performance test ; semen production traits ; growth traits effects

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