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The researches were made within S.C. Semtest BVN Targu Mures on a sample of 1946 ejaculates collected from eight bulls, with the age between two and nine years, of Fleckvieh breed, collected between the year 2000 and 2006. In this direction, to identify main variation sourcesÂ  and the way this factors act upon sperm production and implicitly on the quality of the semen material, sperm parameters were evaluated by the bulls age. Thus, they were determined the following parameters: the volume of the ejaculate, sperm concentration, sperm mobility in raw semen material, sperm mobility in defrosted semen material, obtained and admited doses. Following the researches it was confirmed that the ejaculates volume rises fromÂ  6.07 ml at two years category up to 9.61 ml at six years category, after that decreases; the concentration of raw sperm is higher at young bulls, and regarding the number of obtained and admited doses, the age of the bulls has a signifiant influence, with variations showing an ascendent trend depending on the ageing of the bulls. The results are showing, that depending on the age, the volume of the ejaculate grows, raw sperm mobility and concentration is highier at young age and regarding the obtained and admited doses number, they grow along with the age. Semen production, quantitative and also qualitative, is also influenced by the age of the bulls. Â

Researches Regarding the Influence of the Bulls Age on the Raw and Processed Semen