Candling speed. As the time that the candling operator has to view each egg decreases (for example, from 0.6 seconds per egg to 0.2 seconds per egg), candling efficiency declines. Proportion of second-quality eggs. As the percentage of eggs entering the candling booth increases (for example, beyond 8 to 10%), candling efficiency declines. Removing obviously poor-quality eggs before grading will help reduce the workload of candling operators. Candling Although the intensity of light in itself is not critical, leakage of light around the eggs may reduce efficiency. Candling mirror. Backing mirrors that are not adjusted to the of the candling operator will decrease candling efficiency. Operator. The experience and capability of the operator is a major factor affecting efficiency. Operators should be able to stop the line when overloaded, and should not work at candling too long without a break. Table 2: Sample calculation of weighted average age of flock Total Number Age of number of birds each of birds in lay in number flock in lay each (weeks) in all flock flocks 4.9 1 1000 x 25 ÷ 5050 = + 7.6 2 1200 x 32 ÷ 5050 = + 14.4 3 1550 x 47 ÷ 5050 = + 4 1300 x 64 ÷ 5050 = 16.4 Average flock Total 5050 43.5 age (weeks) The relationship between flock age and the incidence of Figure 3: second-quality eggs, and the Haugh unit measure of internal egg quality.
Candling speed. As the time that the candling operator has to view each egg decreases (for example, from 0.6 seconds per egg to 0.2 seconds per egg), candling efficiency declines. Proportion of second-quality eggs. As the percentage of eggs entering the candling booth increases (for example, beyond 8 to 10%), candling efficiency declines. Removing obviously poor-quality eggs before grading will help reduce the workload of candling operators. Candling Although the intensity of light in itself is not critical, leakage of light around the eggs may reduce efficiency. Candling mirror. Backing mirrors that are not adjusted to the of the candling operator will decrease candling efficiency. Operator. The experience and capability of the operator is a major factor affecting efficiency. Operators should be able to stop the line when overloaded, and should not work at candling too long without a break. Table 2: Sample calculation of weighted average age of flock number Number of birds in lay in each flock Age of each flock (weeks) Total number of birds in lay in all flocks 1 1000 x 25 ÷ 5050 = 4.9 + 2 1200 x 32 ÷ 5050 = 7.6 + 3 1550 x 47 ÷ 5050 = 14.4 + 4 1300 x 64 ÷ 5050 = 16.4 Total 5050 Average flock age (weeks) 43.5 Figure 3: The relationship between flock age and the incidence of second-quality eggs, and the Haugh unit measure of internal egg quality.