Season and Year Effect on Sperm Quality and Quantity in Boars from the Danube White Breed

摘要

A production trial was carried out at the Agricultural Institute - Shumen during the period 2000-2002. The trial comprised 9 boars from the Danube White breed. Season and year effect on the sperm quality and quantity of 396 ejaculates was studied. Itwas established that in autumn and winter, the values of semen volume, sperm concentration and dose number were higher than in spring and summer. Year had a significant and positive effect on semen volume (P < 0.001), dose number (P < 0.01) and spermatozoa survival late at storage up to 72 hours.