Date of this Version
This guide discusses the basis for milk progesterone tests, using the test to confirm estrus, as an early indicator of pregnancy, and the availability and costs of kits. Milk progesterone test kits are now commercially available for on-farm use. Correct interpretation of the test results requires accurate estrous detection and good records. Properly used, these tests can help determine (1) if a cow is near estrus and potentially could conceive if bred, or (2) as an early indicator of pregnancy.