 The study examined the morphology of polymorphonuclear leukocytes in broilers at different ages. It found that the number of monocytes increased significantly from day 1 to day 7, then decreased until day 42. Additionally, the amount of granulocytes with degranulated and decationized lysosomal granules of cationic proteins also decreased from day 1 to day 7, but then increased again from day 23 to day 42. Furthermore, the study found that the use of cationic proteins decreased from day 1 to day 7, but then increased again from day 23 to day 42. Finally, the study concluded that the homeostasis of non-specific immunity was restored and maintained through the recovery of the parody of cationic protein concentration. This article was authored by E. A. Colznick, M. A. Durko, and I. A. Labediva.