EFFECT OF THE PLANT SUPPLEMENT XTRACT UPON EGG-LAYING PERFORMANCE AND EGG HATCHABILITY IN DIFFERENT BREEDS OF CHICKENS

White and Barred Plymouth Rock chickens, divided into three groups: group I - control, group ІІ - fed diet supplemented with 0.01% Xtract and group ІІІ − supplemented with 0.02% Xtract, as well as layers from the Gy-ling and New Hampshire breeds divided into two groups: group I - control, group ІІ -fed diet supplement with 0.01% Xtract, have been studied. 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 t his 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-laying performance decreased. For egg hatchability, no dose- dependent alterations were established that was probably related to the productive type of investigated poultry breeds.