Merck Manual

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Approximate Gestation Periods

Approximate Gestation Periods

Domestic Animals

Days

Cat

65

Cattlea

Angus

281

Ayrshire

279

Brahman

292

Brown Swiss

290

Charolais

289

Guernsey

283

Hereford

285

Holstein

279

Jersey

279

Limousin

289

Shorthorn

282

Simmental

289

Dog

62–64b

Donkey

365

Goat

150

Horsec

335–342

Llama, Alpacac

335–365

Pig

114

Rabbit

31

Sheep

150

Wild Animals

Days

Bear (Black)

210

Bison

280

Camel

365-400

Chimpanzee

236

Coyote

63

Deer (Mule and White-tailed)

200

Elephant

660

Elk, Wapiti

255

Giraffe

425

Gorilla

270

Hare

36

Hippopotamus

240

Leopard

95

Lion

108

Marmoset

150

Monkey (Macaque)

180

Moose

235

Muskox

255

Muskrat

29

Nutria, Coypu

130

Opossum

12

Otter

270–300d

Panther

90

Porcupine

210

Pronghorn

250

Raccoon

63

Reindeer

225

Rhinoceros (African)

480

Seal

330

Shrew

20

Skunk

63

Squirrel (Gray)

40

Tapir

390

Tiger

103

Walrus

450

Whale

450

Woodchuck

31

Wolf

63

Farmed Fur Animals

Days

Chinchilla

111

Ferret

42

Fox

52

Mink

European

41

American

40–75

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