Air hygiene in a broiler house: Comparison of deep litter with raised netting floors

Abstract

1. Deep litter and raised netting flooring systems in broiler houses were compared for their effects on air quality and bird health during an 8-week growing period. 2. Weekly measurements were taken of respirable dust, numbers of airborne microorganisms and concentrations of gaseous pollutants. Airborne fungi and bacteria were identified to species. 3. At the end of the experimental period, randomly sampled bird lungs were examined for the presence of viable microorganisms and for pathological changes. Bird health and performance were monitored throughout the 8 weeks. 4. Respirable dust concentrations and numbers of airborne microorganisms were significantly higher in the litter rooms. The type of floor had no effect on concentrations of gaseous ammonia. 5. Floor type had no significant effect on bird mortality but birds on litter had a slightly better gain:food ratio. However, birds on litter were observed to have a higher incidence of lung damage and more of the birds on litter had viable microorganisms present in the lungs at necropsy.

Measurement of culturable airborne staphylococci downwind from a naturally ventilated broiler house

“…as well as and high ventilation rates can be expected in broiler houses Madelin and Wathes 1989;Oppliger et al 2008). This reflects somehow a worst case scenario in regard to emission amounts.…”

“…These bioaerosols are supposed to present a health risk for the animals in confined buildings and for humans working in this atmosphere (Bull et al 2006;Hartung and Schulz 2008;Madelin and Wathes 1989;Whyte 1993). In recent years, concerns are rising that these bioaerosols when emitted from the animal houses by way of the exhaust air may also pose a health risk for nearby residents or animals in neighbouring farms (Millner 2009).…”

Frações Nitrogenadas, Glicídicas e Amônia Liberada pela Cama de Frangos de Corte em Diferentes Densidades e Tempos de Confinamento

“…Comparando sistemas de criação de frangos sobre cama e sobre malha durante um período de 8 semanas, Madelin & Wathes (1989) mostraram que as concentrações de poeira respirável (partículas menores que 10 mm de diâmetro) e número de microorganismos presentes no ar foram significativamente maiores nos criatórios que utilizavam cama. O tipo da cama não teve efeito sobre as concentrações de amônia, nem tampouco na taxa de mortalidade das aves.…”

Effects of Lipopolysaccride-induced Stressor on the Expression of Stress-related Genes in Two Breeds of Chickens

“…환경오염의 감염원으로서는 박테리아 LPS가 많이 이용 (Shini et al, 2008) 되는데, 계사내 공기위생 적인 측면에서 공기 중의 LPS는 계사내 공기중 먼지의 양과 비례한다는 보고도 있다 (Zucker and Muller, 2000). 또한 육 계사의 형태가 floor litter인 경우가 netting-floored 사보다 먼 지의 농도나 공기중 미생물의 수도 많았으며, 공기중 오염은 밀사 정도가 높을수록 증가하다고 한다 (Madelin and Wathes, 1989). 닭의 환경스트레스에 대한 연구는 일반적으로 사육시 고온에 따른 열스트레스, 사육밀도 및 사육형태에 따른 스 트레스, 수송 등에 따른 스트레스에 집중되어 있었다 (Heckert et al, 2002).…”