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.
Nutrition and environment are important. While fantail goldfish are hardy, they need the ideal spawning conditions. Your fantail goldfish love, love, love cold water, so keep their water colder than for other species -- about 70 degrees F during the day and 50 degrees F at night is ideal.