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Of heifers inseminated in 1977 in the German Democratic Republic, 44.9% were German Black Pieds (GBP), 7.8% GBP X Jersey, 23.4% GBP X (GBP X Jersey) and 13.5% German Black Pied Dairy [GBP X (Jersey X Holstein-Friesian)]. The percentage of 1st inseminations carried out with GBP and German Black Pied ...

Neumann, W.; Rohde, E.
Tierzucht, 1979, 33, 6, pp 250-253