Chickens can abandon their nests and not continue brooding the remaining eggs if they are disturbed while laying eggs.
Hence, be careful not to frighten the chicken when collecting eggs.
If there is an abandoned nest, the remaining eggs should be taken and cleaned to start nesting of another hen.
A hen can brood 12 eggs, hence some more eggs can be put under the hens that have only few eggs for brooding.
Figure 18 Collecting Eggs not to frighten Chickens