First, watch the bull's eye. Three particularly exposed upright blood vessels appear on the iris directly above the pupil of the pregnant cow, the so-called gestational blood vessel, which projects over the surface of the iris and appears purple. The blood vessels on the iris of unpregnant cows are small and not revealed.
Second, alcohol testing. Take 100 milliliters of fresh milk from the cows to be tested and place them in sterile glassware. Add 1 milliliter of medical alcohol, 1 milliliter, into the fresh milk. Mix thoroughly. If condensation occurs within 5 minutes, The cow is already pregnant; if it does not coagulate after half an hour, it proves to be not pregnant.
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