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At an AI centre in the north of the German Federal Republic, 6669 ejaculates from 186 bulls, mainly German Black Pieds, were examined; 20% of ejaculates were rejected as unsuitable for freezing because forward motility was under 70% after collection or under 50% after deep-freezing. Bulls in the...

Boehnke, H.-J.; Roos, B.; Marre, H.; Pfeilsticker, J.
Deutsche Tierarztliche Wochenschrift, 1975, 82, 11, pp 438-441