Physical characteristics of ejaculates produced by insemination boars depending on the interval between successive ejaculate collections

The ejaculate characteristics of Polish Landrace boars showed a significant correlation with the intervals between the successive ejaculate collections. The effect of insemination use intensity was however varied. Rising frequency of ejaculate collection led to a systematic and fairly even fall in ejaculate volume. Ejaculate sperm concentration remained at a relatively high level when ejaculates were collected with a frequency of 7 to 3 days but further shortening of the interval between the successive collections led to a drastic decrease in sperm concentration. An increase in ejaculate collection frequency to every four and fewer days resulted in a significant decrease in the number of spermatozoa present in the produced ejaculates and a concomitant decrease in the number of insemination doses prepared from these ejaculates, with an escalation of such changes.