...Theyproduce early, but are not completely adult for four or five years;the period of gestation is seven months... 
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...
The elephant usually brings forth, after a period of gestation offrom eighteen to twenty-two months, a single calf, though twins areoccasionally born...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...
The period of gestation seems to be about the same as that of thedomestic cow, and the greatest number of calves are born in thesummer...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...The female produces one, or sometimes two in the summer,after a period of gestation of ten months...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...The period of gestation seems to be about the same as that of thedomestic cow, and the greatest number of calves are born in thesummer...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...Since activity, digestion, and gestation depend upon adequate internal temperatures, there must be a process by which these temperatures are attained and for an appropriate time maintained...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...The gestation period is three and one-half to four months...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...The period of gestation isabout 8-1/2 months...
A. R. Harding 「Fur Farming」
...Virginia deer are polygamous, likecattle; the rutting season is in November; the period of gestation isabout seven months, and the fawns are born in May or June...
A. R. Harding 「Fur Farming」
...The number of mammæ vary, as does the period of gestation...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The period of gestation, from observations made by Tessier on 1131 cows, varies to the extent of eighty-one days; and what is more interesting, M...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
... differ in their average period of gestation...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The period of gestation varies according to age, constitution, food, andthe peculiarities of the individual breed...
Robert Jennings 「Sheep, Swine, and Poultry」
...The period of gestation is from 65 to 70 days...
A. C. Smith 「The Raising and Care of Guinea Pigs」
...Strongpurgatives and diuretics are to be especially avoided, unless it is in the verylast days of gestation in very plethoric cows...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...When the cow is spayed, it does away with all troubleattending estrum, or heat, gestation, and parturition with its accidentsand ailments...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...We mustnotice the age, the sex, the state of gestation, and make allowance forany prior complaints to which any of the sick cattle may have beensubject...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
...If it were a fact, or if it were the rule, the evidence tosupport the theory of twelve months' gestation should be overwhelming,considering the number of badgers that are in confinement...
Alfred E. Pease 「The Badger」
...The gestation time of P...
Charles L. Douglas 「Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado」
...In the season of love, and during the period of gestation, they are met with only in pairs—a male and female...
Mayne Reid 「The Hunters' Feast」
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