Evaluation of the Early Conception Factor (ECF™) Test in Cows 3-7 Days Post-Breeding

Abstract

Accurate assessment of the pregnancy status of cattle 3-7 days following conception, in conjunction with prostaglandin administration, could significantly decrease the average days open. The Early Conception Factor (ECF™) test kit (Concepto Diagnostics, Knoxville, Tenn) reportedly detects the open status of a cow 3-15 days post-breeding through the detection of a protein designated Early Conception Factor in the serum of pregnant cows. A protein of this type has been discussed by Threlfall.¹ In order to determine the accuracy of the ECF™ test, sera from 150 dairy cows 3-7 days post-breeding were tested, using the ECF™ test kits. These cattle were then examined for pregnancy by rectal palpation by veterinarians 41-59 days post- breeding.