Swine estrous cycle The estrous cycle in the pig averages 21 days but can range from 17 to 25 days. The first day of standing heat, when the female is receptive to the male and will stand to be mounted, is referred to as day 0.
A: Goldfish mate by spawning. The female releases her eggs into the water, and the male releases his sperm to fertilize the eggs. Goldfish reach sexual maturity at approximately 1 year of age. The mating ritual of goldfish involves the male chasing the female and nudging against her to prompt her to release her eggs.
The only material present should be the spawning mops or plants that will be used to receive the eggs. The water level should be reasonably shallow as goldfish move to the shallows to breed. Again it depends on the size of the breeders how shallow you want the water, 8 to 12 inches is about right.