...The period of incubation is 28 daysbut 2 days more should be added to this to allow forcleaning out the machines, etc... 
Harry M. Lamon 「Ducks and Geese」
...The period of incubation forduck eggs ranges from 26 to 28 days for all of thebreeds except the Muscovy...
Harry M. Lamon 「Ducks and Geese」
...The period of incubation ofgoose eggs is approximately 30 days, but may varyfrom 28 to 33 or occasionally even 35 days...
Harry M. Lamon 「Ducks and Geese」
...They arenever seen near their homes during the day, the bird then on the nestwaiting until night to feed, when the one which has been at sea returnsto assume its share of the task of incubation...
Frank M. Chapman 「Color Key to North American Birds」
...She will cover nine eggs, and incubation will last amonth...
Robert Jennings 「Sheep, Swine, and Poultry」
...Gerlach, having collected the statistics from 133 cases, has found this time,known as the period of incubation, to vary from 14 to 285 days...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The stage of incubation is from three to five days...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The period of incubation isabout four weeks...
John H. Robinson 「Our Domestic Birds」
...The work of incubation is done mostly bythe hen, the cock taking only a minor part...
John H. Robinson 「Our Domestic Birds」
...The period of incubation is two weeks...
John H. Robinson 「Our Domestic Birds」
...But the incubation of the morbid elements pursues its course, thealteration of the blood becomes general, and the circulation isincreased and quickened...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
...First Period—of Incubation...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
...It need hardly be said, that during this period of incubation thefeeding of the cattle must be strictly attended to, and that the animalmust receive unusual hygienic care...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
...Both sexes take part in incubation...
Douglas Dewar 「A Bird Calendar for Northern India」
...Both sexes work at the nest and take part in incubation...
Douglas Dewar 「A Bird Calendar for Northern India」
...The period of incubation for the koel's egg is shorter thanthat of the crow, hence at the outset the baby koel steals amarch on his foster-brothers...
Douglas Dewar 「A Bird Calendar for Northern India」
...The male bird assists the female in performing the office of incubation,and is said to relieve the monotony of his occupation by singing,thus often betraying a well-concealed nest...
Rev. C. A. Johns 「British Birds in their Haunts」
...As it is, after fourteen days' incubation, the eggsare hatched simultaneously, or nearly so, the Cuckoo being generallythe first...
Rev. C. A. Johns 「British Birds in their Haunts」
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