Szukana fraza: [Opis = "The aim of the thesis was to identify the genetic polymorphisms of the chosen genes in sheep of Polish Merino breed and in hybrids population \( Polish Merino, Ile de France, Berrichonne du Cher \) as well as the association of these polymorphisms with the performance traits \( the number of lambs in a litter, body weight of a lamb at 2 and 56 day, daily gains as well as zoometric measurements and body type indices\)"]