If you are breeding quail and incubating their eggs it is important to keep a record of fertility and to calculate the percentage fertility because this will help in evaluating incubation and breeding efficiency.
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.
Quail Egg Fertility November 2007
27 fertile quail eggs divided by 42 quail eggs in the incubator = 64% fertility.
This is a reasonable fertility rate for this time of the year as the male quail‘s fertility is effected by cold temperatures, thus breeding quail in November when the weather is colder can effect the fertility rate of the eggs.