Broiler management during acute heat stress

Poultry production efficiency in many regions of the world is adversely affected by heat distress. Though the problem is seasonal and of variable duration, its effects can be economically significant. As the birdʹs body temperature rises feed consumption, growth rate, feed efficiency, egg shell quality and survivability decline. Many solutions have been proposed, but no sure cure exists for this dilemma. However, a variety of therapeutic approaches based upon sound physical and biological principles do indeed have the ability to significantly reduce consequences of heat distress. In this paper specific body temperature regulatory mechanisms are discussed, as well as management considerations regarding facility design, fasting, management of water temperature and consumption, acid-base balance, acclimation and diet composition considerations. Among dietary composition considerations the use of Virginiamycin has been noted to both increase growth rate and provide an effective aid for the reduction of heat distress mortality.