...7 nest on December 28 (incubationperiod thirty-four days)... 
George Murray Levick 「Antarctic Penguins」
...The most sensitive period for a duck egg is duringthe first 3 or 4 days of incubation...
Harry M. Lamon 「Ducks and Geese」
...Usuallythey will be dried so that they can be movedon the afternoon of the 28th day of incubation...
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」
...Period of Incubation...
Harry M. Lamon 「Ducks and Geese」
...The sitting hen must be given good care, beingeven more particular in this respect than when sheis sitting on hens' eggs as the period of incubation islonger...
Harry M. Lamon 「Ducks and Geese」
...The period of incubation (that is, the time between the exposure of ananimal to infection and the development of the disease) is variable, usuallyfrom three to six days...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Theactual period of incubation may be shorter, for if blood from a case of Texasfever is injected into the blood vessels of healthy cattle the fever mayappear within five days...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The incubation of their eggs by birds is one of the most remarkablethings in nature...
John H. Robinson 「Our Domestic Birds」
...The period of incubation is from thirty to thirty-five days...
John H. Robinson 「Our Domestic Birds」
...Counting from the time the last egg was laid, the periodof incubation is sixteen or seventeen days...
John H. Robinson 「Our Domestic Birds」
...The period of incubation is two weeks...
John H. Robinson 「Our Domestic Birds」
...The horned cattle composing this latter class must becarefully watched, and be made the subject of the preventive treatment,the moment the first sign appears of the working of the incubation...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
...Most birds, whenseized by the mania of incubation, will sit upon anything which evenremotely resembles an egg...
Douglas Dewar 「Birds of the Indian Hills」
...The sun'srays are powerful enough not only to supply the heat necessaryfor incubation but to bake the eggs...
Douglas Dewar 「A Bird Calendar for Northern India」
...From two to four eggs are laid, bothmale and female taking part in the incubation...
Rev. C. A. Johns 「British Birds in their Haunts」
...Each nest contains three to four eggs, on whichthe female sits about three weeks, constantly fed by her partnerduring the whole period of incubation...
Rev. C. A. Johns 「British Birds in their Haunts」
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