Występowanie nieprawidłowości kostnych u kurcząt brojlerów ma złożone podłoże. Przede wszystkim jest to skutek znacznego postępu genetycznego i szybkiego tempa wzrostu ptaków hodowlanych, co zdecydowanie obciąża układ mięśniowo-szkieletowy (Julian 2005; Waldenstedt 2006; Dibner i in. 2007). Brojlery XXI w. charakteryzują się wysoką porowatością kości oraz ich słabą mineralizacją (obserwuje się głównie niedobór wapnia). W konsekwencji może to powodować zwiększone powinowactwo do zmian patologicznych w obrębie układu ruchu. Gorsza motoryka ptaków skutkuje trudnościami w przyjmowaniu paszy i spożyciu wody, co rzutuje na mniejsze przyrosty i niższą końcową masę ciała, a to przekłada się na straty finansowe.

 

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