Recent surveys and sample collection have conWrmed the endemicity of Dermanyssus gallinae in poultry farming worldwide. The reduction in number and eYcacy of many acaricide products has accentuated the prevalence rates of this poultry ectoparasite observed more often in non intensive systems such as free-range, barns or backyards and more often in laying hens than in broiler birds. The lack of knowledge from producers and the utilisation of inadequate, ineVective or illegal chemicals in many countries have been responsible for the increase in infestation rates due to the spread of acaricide resistance. The costs for control methods and treatment are showing the tremendous economic impact of this ectoparasite on poultry meat and egg industries. This paper reviews the prevalence 1 C rates of this poultry pest in diVerent countries and for diVerent farming systems and the production parameters which could be linked to this pest proliferation.

Recent surveys and sample collection have conWrmed the endemicity of Dermanyssus gallinae in poultry farming worldwide. The reduction in number and eYcacy of many acaricide products has accentuated the prevalence rates of this poultry ectoparasite observed more often in non intensive systems such as free-range, barns or backyards and more often in laying hens than in broiler birds. The lack of knowledge from producers and the utilisation of inadequate, ineVective or illegal chemicals in many countries have been responsible for the increase in infestation rates due to the spread of acaricide resistance. The costs for control methods and treatment are showing the tremendous economic impact of this ectoparasite on poultry meat and egg industries. This paper reviews the prevalence 1 C rates of this poultry pest in diVerent countries and for diVerent farming systems and the production parameters which could be linked to this pest proliferation.

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The main objective in broiler breeder production is to produce fertilized eggs resulting in healthy and robust day-old broiler chicks. Due to the continuing increase in the genetic potential of the offspring and the improved reproduction performance, there is a high need for professional management and poultry health care of broiler breeder flocks. Implementation of strict biosecurity measures in combination with intensive, well-orchestrated vaccination programs must prevent disease challenges for both breeders and offspring. Points of attention during the rearing period are stress factors like necessary feed restriction, flock density, bird handling, transport and vaccination reactions. A good coordination between rearing and laying period in equipment, management, feed strategy and health care is crucial for maximum chick performance. This chapter gives an overview of the diseases, vaccinations and direct and indirect effects of management and nutritional interventions on health and productivity in broiler breeders.

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