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Conception Rates in Dairy Cattle from Services at various Intervals after Parturition¹

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

Previous reports agree in general on the advantages of a higher breeding efficiency for cows bred more than 60 days after parturition. All research previously published, however, was based on tabulations made from accurate records but without a carefully controlled experiment to obtain the data. The purpose of the research reported herein was to get additional information under carefully controlled conditions involving only experimental cows with normal reproductive organs, as determined by careful examinations, and with a history of good genital health after parturition.

VanDemark and Salisbury (9) analyzed the breeding records of 593 cows representing five dairy breeds in the University of Illinois herd. From a total of 1,674 pregnancies they concluded that fertility increased with the length of the postpartum interval to first service up to 80 days. The percentage of services that resulted in conceptions, for 212 services with a postpartum interval of 60 days or less to first service, was very low.

¹ Supported in part by state funds and in part by funds from the regional project N.E.-1, entitled Causes and Prevention of Reproductive Failures in Dairy Cattle, a cooperative study by agricultural experiment stations in the Northeastern region and the Bureau of Dairy Industry, USDA.