Selection of chicken eggs

First, the appearance of clean, no chicken droppings, blood spots, dust, broken eggs. Second, the number of picking up eggs is more than 4 times a day. When the eggs were collected within 7 days, the hatching rate decreased significantly after 12 days. Third, the weight is about 60 grams, the white shell eggs are smaller and the brown shell eggs are bigger. Fourth, the egg shape is oval, the egg shape index is 1.35, and the thickness of the eggshell is about 0.33 mm. Fifth, through the light of the egg, the fresh egg gas chamber is small, the egg white is thick, the egg yolk does not shake violently, and the normal egg yolk is orange or yellow. Sixth, cross-section to determine the height of protein, that is, the eggs are beaten on a horizontal glass plate, and the height of fresh eggs is large.