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Data on 978 cows in 11 groups of bull daughters were analysed. The interval from 1st insemination to conception averaged 53.9±40.4 days, service period 109.1±44.3 days, and the number of inseminations per conception 1.87±1.1. For the daughters of progeny-tested bulls, the CR to 1st insemination...

Busch, W.; Willer, H.; Kregel, H.
Tierzüchter, 1996, No. 2, pp 28-31