This table lists the proper age for first mating, the animals' period of fertility, the number of females for one male, and period of gestation (days) for: ewe, ram, mare, stallion, cow, bull, sow, boar, doe goat, buck goat, bitch, male dog, queen cat, tom cat, doe rabbit, and buck rabbit.
Sources: http://www.almanac.com/content/gestation-and-mating-tables