Quality of fresh semen collected from Estonian Holstein A.I. bulls
2000
Padrik, P. | Jaakma, Ue. | Mueuersepp, I. (Estonian Agricultural Univ., Tartu (Estonia). Inst. of Veterinary)
From February to December 1998 twenty nine dairy A.I. Holstein bulls were used to study the effects of age, breed and season on sperm concentration, the incidence of morphological abnormalities, sperm motility and intactness of plasma membrane in fresh semen. The highest percentage value of sperm abnormalities was recorded for bulls imported from Germany, however if compared to the corresponding values for the bulls imported from the Netherlands or raised in Estonia, these differences were nonsignificant (P0.1). The incidence of sperm abnormalities was not significantly affected by age of the bulls and the season of semencollection. The tendency was recorded for higher incidence of sperm abnormalities during summer season (13.8 per cent). The intactness of sperm plasma membrane assessed by HOS-test was affected by country of origin and age of the bull, and season of semen collection. Differences in sperm motility were caused by country of origin and age of the bull. The season effect was not detected. These results indicated that bull age, breed and season of semen collection can influence sperm characteristics and must be considered in evaluation of bulls for breeding and planning semen collection
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