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Milk Yield in Relation to Recurrence of Conception

Department of Dairy Husbandry, University of Illinois, Urbana, Illinois

ABSTRACT

The first full calendar month milk yield and the service period (calving to conception) of 4671 Guernsey A. R. records show a coefficient of correlation of 0.039 ± 0.010. There is no evidence that high rate of milk secretion interferes with the recurrence of conception in these records. The mean service period is 174 days, standard deviation 81 days, coefficient of variability 47. From generalized premises the service period is far too long for the most economical life time production. The records for the same period show no record of breeding up to 380 days for 222 cows (= 4.54 per cent of 4893).