Effect of the plant supplement xtract upon egg-laying performance and egg hatchability in different breeds of chickens
2008
Semerdzhiev, V., Thracian University, Stara Zagora (Bulgaria) | Yarkov, D., Thracian University, Stara Zagora (Bulgaria) | Chobanova, S., Thracian University, Stara Zagora (Bulgaria) | Girginov, D., Thracian University, Stara Zagora (Bulgaria) | Uzunova, K., Thracian University, Stara Zagora (Bulgaria)
It was found out the supplementation of the diet of White Plymouth Rock hens with 0.01% and 0.02% Xtract increased the egg-laying performance with 6.2% and 9.7%, that was important with regard to broiler production. In this breed, the egg hatchability percentage from fertilized eggs increased up to 98.21% when the diet was supplemented with 0.02% Xtract. In the other studied breeds, the egg-lsying performance decreased. For egg hatchability, no dose dependent alterations were established that was probably related to the productive type of investigated poultry breeds.
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