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In 1973-74, a postal survey was carried out on spring-calving dairy cows in the Irish Republic. For 8285 inseminations, the overall CR was 66%. The interval from calving to 1st insemination averaged 69 days. For cows conceiving to 1st insemination, this interval was significantly longer (70 days)...

Sherington, J.; Roche, J. F.; Cunningham, J. F.; Mitchell, J. P.
Irish Veterinary Journal, 1978, 32, 8, pp 137-142