The Prolapse in Layer Hens

Prolapse which causes low productivity in laying hens is a serious sickness. rather than having a specific cause, prolapse occurs due to many factors coming together. the main reasons of prolapse are; intestinal infection due to high light density, animals with weight problems, age at sexual maturity, early photosimulation, unbalanced feed formulation and laying double yolked eggs. use of unbalanced formulation in laying hens causes low egg production and increase of prolapse problem. the main parameters in feed formulations which help to prevent prolapse, are energy, protein levels together with calcium and phosphorus levels. in this review article, the main causes of prolapsus inlaying hens are reviewed.