Ewe Ram

Mare Stallion Cow

Gestation and Mating Table

Proper Age for Period of Number of Females

First Mating Fertility (yrs.) for One Male 90 lbs. or 1 yr. 6

12–14 mos., 7 50–752 / 35–403 well matured

33 yrs. 3 yrs.

15–18 mos. 6

Period of Gestation (days)
AVERAGE RANGE
147 / 1511 142–154

10–12

12–15

10–14

336

310–370

40–454 / Record 2525

283

279–2907 262–3008

504 / Thousands5

Bull 1 yr., well matured 10–12

Sow 5–6 mos. or 250 lbs. 6 115 110–120

Boar 250–300 lbs. 6 502 / 35–403

Doe goat 10 mos. or 85–90 lbs. 6 150 145–155

Buck goat Well matured 5 30

Bitch 16–18 mos. 8 63 58–67

Male dog 12–16 mos. 8 8–10

Queen cat 12 mos. 6 63 60–68

Tom cat 12 mos. 6 6–8

Doe rabbit 6 mos. 5–6 31 30–32

Buck rabbit 6 mos. 5–6 30

1For fine wool breeds. 2Hand-mated. 3Pasture. 4Natural. 5Artificial. 6Holstein and beef: 750 lbs.; Jersey: 500 lbs. 7Beef;

8–10 days shorter for Angus. 8Dairy.

Incubation Period of Poultry (days)

Chicken .................. 21

Duck. . . . . . . . . . . . . . . . . . 26–32

Goose. . . . . . . . . . . . . . . . . 30–34

Guinea. . . . . . . . . . . . . . . . 26–28

Maximum Life Span of Animals in
Captivity (years)
Cat (domestic) . . . . . . . . . . . . 34
Chicken (domestic) . . . . . . . . 25
Dog(domestic)............ 29

Duck (domestic). . . . . . . . . . . 23

Goat (domestic) . . . . . . . . . . . 20

Goose (domestic) . . . . . . . . . . 20

Horse.................... 62

Rabbit................... 18+

Mare

Estral/Estrous Cycle (including heat period)

AVERAGE RANGE 21 days 10–37 days

Length of Estrus (heat) AVERAGE RANGE 5–6 days 2–11 days

When Cycle
Recurs If Not Bred
21 days

Sow

21 days

18–24 days

2–3 days

1–5 days

21 days

Ewe

161⁄ 2 days 14–19 days

30 hours

24–32 hours

161⁄ 2 days

Goat Cow

21 days 21 days

18–24 days 18–24 days

2–3 days 18 hours

1–4 days
10–24 hours

21 days 21 days

Bitch

24 days

16–30 days

77 days

5–9 days

Pseudo-pregnancy

Cat

15–21 days

3–4 days, if mated

9–10 days, in absence of male

Usual Time of
Ovulation
24–48 hours before
end of estrus
30–36 hours after
start of estrus
12–24 hours before
end of estrus
Near end of estrus
10–12 hours after
end of estrus
1–3 days after
first acceptance
24–56 hours after
coitus

References:

Archives