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After ingestion of 2 gm/kg of a relatively nontoxic lubricating oil, one mallard (Anas platyrhynchos) and two Pekins stopped laying for about 2 weeks. Very small quantities of oil coated on mallard eggs reduced their hatchability to 21 percent compared to 80 percent found for unoiled mallard eggs. Experimentally oiled mallards continued incubating their clutches, but their eggs did not hatch even though they continued incubation for longer than normal periods.
The Journal of Wildlife Management © 1965 Wiley