And interpretation of ducks embryo development

Abstract

It is well known that the brooding period, the size of the chicks and their maturity during the hatching period are significantly depend on the species of birds and closely related to the genetic factors and environmental conditions. The investigation of embryonic development on the model of poultry hatching eggs is a vivid effective, readily accessible and budget-oriented method. The article presents data on the use of instru ments and equipment (ovarioscope, incubator), characterizes the mode of duck eggs brooding, shows the methods used in the investigation of incubated eggs - ovaroscopy, anatomization and morphometry. The aim of the research was to visualize the embryonal development of ducks and interpret the obtained data. The goals of our research were 1) to obtain daily photos of embryonic development; 2) to describe daily visible changes in development, to weigh and measure the embryos. The pictures of anatomized embryos of Peking meat breed ducks, which obtained by photographing in the period from 1st to 27th days of incubation, are presented in our article. The research shows the formation and increasing in the size of cicatricle in the early stages of incubation in the period from 1st to 4th days of its development and describes the pictures of cardiovascular system formation and the branching of the capillary network from the 4th day of incubation. There are the data on the formation and development of the first rudimentary feathers on the tail on the 10th day, the formation of claws on the 12th day and the formation of egg tooth on the 14th day of incubation. It is established that on the 21st day there is no albumen in the egg and the yolk is becoming compact. On the 22nd day, the yolk begins to retract into the abdominal cavity, on the 25th day, the yolk sac with its contents is retracted into the abdominal cavity by 2/3, the eyes of the embryo begin to open. On the 27th day of incubation, the embryo is formed, the yolk sac is completely retracted into the abdominal cavity, and the eggshell pecking begins. The article presents the data on the morphometry of embryos, showing their mass and length growth during the incubation period