Merck Manual

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Approximate Gestation Periods

Approximate Gestation Periods

Domestic Animals

Days

Wild Animals

Days

Cat

65

Bear (Black)

210

Cattlea

Bison

280

Angus

281

Camel

365-400

Ayrshire

279

Chimpanzee

236

Brahman

292

Coyote

63

Brown Swiss

290

Deer (Mule and White-tailed)

200

Charolais

289

Elephant

660

Guernsey

283

Elk, Wapiti

255

Hereford

285

Giraffe

425

Holstein

279

Gorilla

270

Jersey

279

Hare

36

Limousin

289

Hippopotamus

240

Shorthorn

282

Leopard

95

Simmental

289

Lion

108

Dog

62–64b

Marmoset

150

Donkey

365

Monkey (Macaque)

180

Goat

150

Moose

235

Horsec

335–342

Muskox

255

Llama, Alpacac

335–365

Opossum

12

Pig

114

Panther

90

Sheep

150

Porcupine

210

Fur Animals

Days

Pronghorn

250

Chinchilla

111

Raccoon

63

Ferret

42

Reindeer

225

Fox

52

Rhinoceros (African)

480

Mink

Seal

330

European

41

Shrew

20

American

40–75

Skunk

63

Muskrat

29

Squirrel (Gray)

40

Nutria, Coypu

130

Tapir

390

Otter

270–300d

Tiger

103

Rabbit

31

Walrus

450

Wolf

63

Whale (Sperm)

450

Woodchuck

31

a Individuals may range ±7–10 days from these averages.

b Gestation period is 58–72 days from breeding at unknown stage of estrus; from day of ovulation (which can be determined by progesterone or LH monitoring), gestation period is 62–64 days.

c Individuals may range 20 days from these averages.

d 180+ days due to delayed implantation