...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 female usually produces one kid in the autumn, about Septemberor October, and the period of gestation is about seven months...
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」
...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)」
...It has been objected that our domestic dogs cannot be descended from wolves or jackals, because their periods of gestation are different...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The number of mammæ vary, as does the period of gestation...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Hunter found that the gestation of a mongrel from wolf and dog ('Phil...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Cuvier found the period of gestation of the wolf to be ('Dict...
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」
...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」
...Apparently the gestation period in the Cariboucovers approximately eight months or a little less...
Francis Harper 「The Barren Ground Caribou of Keewatin」
...The rutting season is in August, and continues for about a fortnight;the calves are produced in May; thus, the period of gestation is betweennine and ten months...
George Vasey 「Delineations of the Ox Tribe」
...Furthermore, the period of gestation of the Brahmin Cow (according tothe MS...
George Vasey 「Delineations of the Ox Tribe」
...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」
...Svihla(1932:19) reported the gestation period for non-lactating P...
Charles L. Douglas 「Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado」
...The gestation time of P...
Charles L. Douglas 「Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado」
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