Features of maternal behavior in birds. Poeznye advice for the farmer. Females birds begin to show parental interest and long before the appearance of offspring, which is associated with certain physiological characteristics. In Unlike mammals, birds, hatching is not an embryo, but only an egg in its initial stage of fertilization. And the birds in the ovary is a lot of rudimentary ovules. In wild birds during the breeding season, one or more of the them (depending on the type of poultry) grows, accumulating nutrients, becoming egg yolk, which is surrounded by tissues of the ovary (follicles). When the egg matures, the follicle breaks and the egg, surrounded by egg yolk, falls in the oviduct, in the upper part of which merges with the male gametes (fertilization), after which the fertilized egg continues its movement along the oviduct.
During this promotion yolk enveloped protein that is produced in a certain part of the oviduct. In the lower part of the oviduct, the egg is delayed for a long time – is the formation of the shell. Thus, the egg of birds is the yolk, while protein podskorlupnye shell and the shell – this add-on required for the further development of the fetus outside the mother's body in the air. Coming out of the oviduct and getting into the air, the egg cools, due to which the protein several contracts, and blunt end of the egg shell podskorlupnye diverge, and between them formed air space (nougat), which are available through the pores in the shell due to the difference of osmotic pressure is absorbed air. The same technology formed an egg and poultry. Birds are divided into nestling and brood. At first the eggs are smaller and poorer in yolk than in the second, and embryonic development ends at the earliest stage. And they same output, blind and naked chicks, helpless, which require parental care.
From poultry, these include doves. In precocial birds, eggs are large, and the young displayed the most developed and mature, which is capable of not only follow the mother, but also self-peck for food. This includes all agricultural, domestic poultry – chickens, ducks, geese, turkeys, guinea fowl. Oviposition and hatching in the wild birds after education married couples seek out his own territory and engaged in hatching eggs laid.