...From the circumstances of the capture of the mother it appears thatthe period of gestation of the rhinoceros is about the same as thatof the hippopotamus, viz... 
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 mating season of course varies, but is mainly in January and February, the period of gestation being nine weeks...
A. R. (Arthur Robert) Harding 「Wolf and Coyote Trapping」
...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.」
...Tessier, who has closely attended to this subject, allows a difference of four days in the gestation of the dog...
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.」
...In this graduated difference, in these cross-bred animals having different proportions of Southdown blood, we see how strictly the two periods of gestation have been transmitted...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The period of gestation is from 65 to 70 days...
A. C. Smith 「The Raising and Care of Guinea Pigs」
...When she hasconceived, the cow usually becomes more quiet and docile, and lays on flesh andfat more rapidly, especially during the first four months of gestation...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...In a loose,pendent abdomen in the latter months of gestation the skin may often be seenpushed out at a sharp angle, irrespective of the period of drinking...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Apparently the gestation period in the Cariboucovers approximately eight months or a little less...
Francis Harper 「The Barren Ground Caribou of Keewatin」
...Period of gestation unknown...
George Vasey 「Delineations of the Ox Tribe」
...The usual gestation period for wolves is about 63 days(Brown 1936)...
Thomas F. Weise 「An Experimental Translocation of the Eastern Timber Wolf」
...Mice and the black and roof rats producesmaller litters, but the period of gestation, about 21 days, and thenumber of litters are the same for all...
David E. Lantz 「House Rats and Mice」
...The gestation period of nine non-lactating females of 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」
...How it copulates,those who pretend to have seen disagree in their accounts: nor dowe know how long the period of gestation lasts...
Watkin Tench 「A Complete Account of the Settlement at Port Jackson」
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