Fertility of boars of foreign origin

Abstract

The following research results have been presented: assessment
of sperm quality of large white boars, duroc, landrace and
pietrain (German selection) boars. Also the results of research
of breeding capacity of large white sows and landrace sows of
French origin while crossbreeding with the above mentioned
boars of German origin have been stated. Essential difference in
concentration, volume, motility of sperm of German origin depending on both breed and season has been ascertained. The
most appreciable heterosis effect connected with multi-fertility
is shown by crossbreeding of large white sows of French selection with large white boars of German selection.