Gestation (Average Length Of Pregnancy)

Horses: Heavy (Draft) The normal is 330 to 340 days.
Light (Riding) The normal is 340 to 342 days.

Donkey: The normal is 365 days.

Dog: The normal is 59 to 66 days
Dog: 58 to 70 days noted in rare occurrences.

Cat: The normal is 58 to 65 days

Reproductive Cycles (Average)

Horse: Cycle Length: Normal is 21 days. Can vary from 19 to 26.
Duration of Estrus: Normal is first 6 days of cycle.
Can vary from 2 to 10 days.
Best breeding Time: Early on 3rd day, then every 2nd day,
until the mare refuses to accept the stallion.

Dog: Cycle Length: Normal is 21 days.
Duration of Estrus: From day 10 of her cycle until the female
no longer stands for the male.
Best breeding Time: day 10, 12, 14, continuing until
the female no longer accepts the male "Willingly".

Cat: Cycle Length: 14 to 21 days.
Duration of Estrus: Normal is 6 to 7 days during her cycle.
Best breeding time: Daily from day 2 of Estrus. Until
the female no longer accepts the male.

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