Male ducks, which are called drakes, fertilize eggs through copulation with female ducks, known as hens. Copulation typically occurs after a courtship ritual during mating season, which is in early spring. Drakes must mate with hens once every four to five days to ensure fertilization.Continue Reading
According to PBS.org, ducks practice internal fertilization, which means the process takes place inside the hen's reproductive tract. This protects the developing egg.
According to SouthFloridaMuscovyDucks.com, drakes engage in courtship rituals that include head bobbing, exaggerated feeding movements, preening and counter-movements. They also emit calls particular to courtship and stand in specific postures, such as holding their head and tail up.
According to About.com, reproductive organs of birds differ from mammals'. When ducks are ready to mate, their reproductive organs swell within a bodily exit called a cloaca. Both drakes and hens have cloacas. Once a hen has indicated her acceptance of a drake, the drake balances on top of the hen, and copulation occurs. An extension of the cloacal wall via lymphatic fluid forms a penis, which allows ducks to mate in the water without the sperm washing away.
The egg and sperm combine inside the hen to create a fertilized egg, a zygote, which is coated in a protective shell. The hen lays the egg and sits on it until it hatches, which is called brooding. Drakes generally abandon the hen to her brooding.Learn more about Biology
How sharks reproduce varies and can include laying eggs in secluded nursery waters or giving birth to live pups after the lengthy internal gestation of eggs, but all sharks mate via internal fertilization during copulation. Nurseries are warm, shallow waters where young sharks are safe from large predators and can feed on the plentiful fish around them before swimming out into the open sea.Full Answer >
Birds fertilize their eggs through copulation or male and female sexual interaction. The male bird produces sperm which is deposited into the female's cloaca during mating, and this results in the internal fertilization of the eggs.Full Answer >
A lack of calcium, an imbalance in diet and aggression from other hens are the three leading causes of soft-shelled eggs in hens. Some less-common causes of soft-shelled eggs include parasites, diseases and inadequate genetics.Full Answer >
Hatcheries raise poultry by fertilizing hens that lay eggs, cleaning the eggs and placing the eggs in an incubator that rotates and keeps the eggs at the ideal temperature. They also vaccinate the chicks once they are hatched.Full Answer >