Duck egg

Definition and stakes

James Rankin,  Natural and Artificial Duck Culture

“ This can be done much sooner, but a large machine full cannot be tested in a minute, and the eggs should be far enough advanced so that the operator can take two or three in his hand at once, and passing them before the flame, readily detect [Pg 60] the germ. I never use a tester for duck eggs, as a simple flame is sufficient, the egg being translucent.
During the first stages of incubation the germ is very distinct, even at the third day. The clear eggs are reserved for family use or disposed of to bakers. An expert cannot distinguish them from a fresh-laid egg, either in taste or appearance.
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Source: Gutenberg

Harry M. Lamon,  Ducks and Geese

“ As the egg laying season advances the eggs laid by the ducks tend to get a little larger.
Temperature. Up to the time of testing, that is, about the fifth day, the incubator is run at a temperature of from 101 to 102 degrees. After the fifth day the temperature is kept as near 103 as possible. The most sensitive period for a duck egg is during the first 3 or 4 days of incubation. If they are allowed to get too warm during this time the germ may be killed while if the temperature is too low, development will be retarded.
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Source: Gutenberg

Charles Morris,  Home Life in All Lands—Book III—Animal Friends and Helpers

“ When the baby duck gets out of the egg and is ready to begin life it is shut up for a few days and fed on soft food, such as ground wheat and barley mixed with hard-boiled egg. After this it is let out into the field and set free to search for the animal food it needs. In Belgium, where many ducklings are raised, it is comical to see the breeder hopping about the field on big wooden shoes, kicking up the earth as he goes so as to force out the worms for the little strangers to feed on. ”
Source: Gutenberg

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