Influence of genotype on eggshell strength and the hatchability of laying parent stock flock

This research was conducted with aim to establish genotype influence on eggshell strength of fertilized eggs and its hatchability at parents stock flock of laying type. Eggs from parent’s flock of lines ISA Brown and DeKalb White at age of 36-60 weeks were examined. Experiment lasted 6 months, and once a month were examined samples of 30 fertilized eggs. Results have shown significant differences (P ≤ 0.05) in eggshell strength related to genotype influence. Eggs with brown eggshell from line ISA Brown (P ≤ 0.05) had significantly more strength eggshell compared to eggs with white eggshells from line DeKalb White. Results from the analyses of breeding eggs hatchability, examined in the mentioned period have shown that this variable was mainly influenced by age, then by genotype. Eggs of older birds were lower hatchability compared to fertilized eggs produced of younger parent stock flock during the examination period.