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Preg checking cows? Pregnostx Pregnancy Tests are ready for on-farm use and deliver fast and accurate pregnancy test results from a simple blood sample and is now validated for use on cattle, sheep and goats. Test as early as 28 days post-breeding. Easy to use: Draw blood sample, shake tube 10 times, place blood into sample port, add 3 drops of chase and results will show after 30 minutes.