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.
Goldfish spawn in the spring, when water temperatures rise after the cold winter. Therefore, to encourage your goldfish to lay eggs, you should lower the temperature of your tank in the winter months to between 10Â°C/50Â°F and 12Â°C/54Â°F. Then, when you want to induce breeding, gradually raise the temperature of the water to between 20Â°C/68Â°F and 23Â°C/74Â°F.