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In 1964 in Poland, 3 million cows, constituting 50% of the total cow population, were inseminated. Based on number of calves born, C.R. averaged 89%. There were 57 A.I. stations and semen was obtained from 1573 bulls of which 77% were Polish Black Pied, 5% Red Pied, 13% Polish Red and 2% Red...

Bielañski, W.
Tierzuchter, 1966, 18, pp 815-816