Mortality in laying hens and broilers under differnet rearing systems

Abstract

Poultry farming under free range alternative production systems has shown an increasing tendency in recent years. In contrast to conventional facilities where all production parameters are controlled by the producer, one of the major constraints identified in free range systems is the inability to control range-related production factors. Free range involves birds living outdoors for a large part of the day with plenty of fresh air, sunshine and open space to roam in, which can promote their health and welfare. However, free range birds may come into contact with adverse factors such as parasites, predators and disease vectors that can contribute to mortality as one of major production parameters in poultry farming. The objective of this study was to report findings of a number of studies to point to differences in mortality rate between conventional birds and birds kept under alternative rearing systems, and identify the most common causes of mortality.