Incubation Technique of Duck Eggs
Duck egg structure: duck eggs from the shell, shell membrane, air chamber, protein, egg yolk, lace, ovule or blastodisc and other components.
Is the outer layer of eggs, hard shell of calcareous. The thickness of the varieties (lines), nutritional levels, seasonal, physiological and genetic factors are different, generally between 0.26-0.38 mm. Eggs of different parts, its thickness is also slightly different
, The sharp end of the egg is slightly thicker than the blunt end. Eggshell outer shell membrane, the shell by the sponge layer and the layer of the composition of the nipple.
(1) shell film, close to the outer shell layer of gelatinous film, shell closed shell pores, limiting the evaporation of egg moisture, the prevention and control of pathogenic microorganisms invade eggs, play a protective effect.
(2) layer of the sponge layer is composed of crystalline minerals deposited on the papillary layer of a hard layer, about 2/3 of the thickness of the shell, with considerable hardness and pressure resistance, play a fixed egg shape and protection The role of egg content. The thickness of the sponge layer is different, the thicker the sponge layer, the thicker the shell is, the greater the degree of pressure resistance of eggshell, eggshell long axis of the pressure greater than the short axis. Therefore, the eggs in the transport process should be put.
(3) The papillary layer, about 1/3 of the thickness of the shell, composed of numerous small round papillae, the basis for the sponge layer, the egg has a certain strength of the main components. There are many pores in the eggshell, the size of stomata inconsistent, diameter of 4 to 40 microns, stomatal hatching embryos are the development of material metabolism and gas exchange of the important channel. Blunt end of the largest number of pores.
Second, the shell membrane
Shell membrane inside and outside the two layers, the inner layer surrounded by protein, called protein membrane or inner shell membrane; shell close to the shell surface called the shell membrane. Inner shell film is thin, thickness of about 0.05 mm. The outer membrane is three times as large as the inner shell membrane. The inner and outer shell membrane has stomata. The reticular fibrous structure on the shell membrane is rough and the pores are large. The microflora can pass through. The reticular fibrous structure of the inner shell membrane is close and meticulous, and the pores are small. Play a certain role in the barrier.
Third, the air chamber
Eggs in the female duck fallopian tube and no air chamber, in the egg output in vitro, due to the outside temperature in the body temperature, the contraction of the egg content, so that the blunt end of the egg (large head) shell membrane separation and the formation of a gap , Called the air chamber. Egg protection
The longer the storage time, the more dispersed eggs, more air, air chamber increases. Therefore, the freshness of the eggs can be identified according to the size of the chamber.
Is a white viscous translucent semi-fluid material. By the concentration of protein, within the dilute protein, the outer concentration of protein and outer dilute four layers. The outer layer is the inner thin protein, accounting for 17.3%; and the outer layer of the outer concentration of protein, accounting for 57.0%; outer dilution of the protein As the outermost layer, accounting for about 23%, with the preservation of the extension of time, the role of enzymes in the protein, concentrated protein gradually thinning, dilute protein increases. Therefore, the viscosity of the protein can also be used to determine the freshness of the egg.
5, egg yolk
Is an opaque yellow semi-fluid material, surrounded by the yolk membrane, the cooked egg yolk cut, visible yellow yolk by the yellow yolk and white egg yolk alternately into concentric circular ring arrangement. The formation of the shallow-yolk layer is due to different diurnal metabolic rates of poultry
. In diets with higher or more lutein and carotenoid content, the more obvious the depth of the yolk layer. Eggs in the production of female eggs, deep layer of yellow yolk layer 6, less egg production, the level of yolk increased.
Is the egg protein concentration in the process of the formation of tubal egg, egg yolk rotation forward, twisted before and after the ends of the egg yolk strong ties, plays a role in the location of fixed egg yolk, egg yolk is always located in the center, Shell membrane adhesions to prevent early in the process of hatching embryonic and shell membrane adhesion to ensure the normal growth and development of embryos.