a1 Department of Physiology and Pharmacology, University of Agriculture, Faisalabad, Pakistan
a2 Department of Clinical Science, Faculty of Veterinary Medicine, Razi University, Iran
a3 Department of Animal Production, Faculty of Veterinary Medicine, University of Bari ‘Aldo Moro’, 70010 Valenzano, Bari, Italy
Moulting is a complex process, induced by diet manipulation, which results in renewal of reproductive system and subsequent better production. Conventionally, moulting has been practised by utilising feed withdrawal in many developing countries, however, this has been associated with many drawbacks. Alternative types of moulting practices have been studied, however, these are not practised widely due to a range of undesirable effects. As a consequence of the beneficial effects on laying hens, better post-moult performance and a less criticised method according to poultry welfare advocates, Zn-induced moulting has been considered superior to forced-moulting. Different aspects of Zn-induced moulting related to physiology and production, with special reference to immunohistochemistry of pituitary gland as affected by Zn-induce moulting are included in this review.
(Received February 03 2011)
(Accepted May 16 2011)
(Online publication August 10 2011)