Abstract
Summary
The ovarian hyperemia reaction in immature rats was studied following the subcutaneous injection of equine serum from 38 mares and 4 female donkeys, 42-138 days after natural insemination. The accuracy of this 24-hour pregnancy test was 83%, failures being observed both by negative reaction in 4 pregnant cases and positive reaction in 3 non-pregnant ones.
Acknowledgment is due to M. X. Camargo, J. Vieira and S. Fontes for kindly supplying the blood samples tested.
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