If you are breeding poultry and incubating their eggs it is important to keep a record of hatchability and to calculate the percentage hatchability, percentage fertility and percentage of total eggs hatched because this will help in evaluating incubation and hatch efficiency.
The percentage of hatchability is the percentage of eggs which actually hatch out as live young.
% hatchability = number of eggs hatched out/number of fertile eggs.
The percentage of fertility is the percentage of fertile eggs of all the eggs produced.
% fertility = number of fertile eggs/number of total eggs produced or set.
Calculating Hatch Rate
The percentage hatch rate is the percentage of total eggs hatched out.
% hatch rate = number of eggs hatched out/number of eggs set in the incubator.