An average number of ejaculates and ejaculate volumes, total yearly ejaculate volume, sperm concentration, percentage of sperm with progressive motion, survival rate of sperm and total number of semen doses obtained from 126 bulls /51 Lowland Red-White and 75 Lowland Black-White/ were examined in the first and the second year of bulls' reproduction performance. We studled 24603 ejaculates in 1976-1985. The bulls were divided into 4 groups according to the season beginning their performance: I group - March-May, II group - June-August, III group - Sept.-Nov., IV group - Dec-Febr. In Lowland Red-White bulls, in the first year of their performance, we observed highly significant concentration of sperm in group IV compared with that in groups II and III and significantly lower concentration compared with that in group I. The percentage of spermatozoons with progressive motion was significantly lower in groups II and III. In the sperm of Lowland Black-White bulls, in the second year of their performance, bigger, number of ejaculates and higher total ejaculate volume were noticed in group I compared with these in group II. Sperm concentration was significantly higher in group III than that in group IV. The percentage of the sperm with progressive motion was significantly higher in group II than that in group I and significantly higher in group II than in groups I and IV. No effect of the season beginning the reproduction performance on the total quantity of semen was found in the breeds studied.
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