The influence of an oil contrast medium on fertilization in rabbit oviducts was investigated. The oil contrast medium (Lipiodol-UF) was injected into the catheterized oviducts of anaesthetized animals, and they were mated 1, 3, 5 or 7 days later. When mating took place 1 day after injection, none of the ova that were subsequently recovered were fertilized; the fertilization rates when mating occurred 3, 5 or 7 days after injection of the medium were 78.9, 90 and 100%. Fertilization within the oviduct was, thus, impaired by the injection of oil contrast medium, but appeared to be fully recovered 7 days later.
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