Steve Walkden-Brown

1. IntroductionInfectious bronchitis (IB) and Newcastle disease (ND) are highly transmissible diseases that cause substantial economic losses in the poultry industry [1, 2]. Infectious bronchitis is caused by infectious bronchitis virus (IBV), a gammacoronavirus with a single-stranded positive sense RNA genome [3]. Newcastle disease is caused by virulent strains of Newcastle disease virus (NDV), a ...

1. IntroductionInfectious bronchitis (IB) and Newcastle disease (ND) are highly transmissible diseases that cause substantial economic losses in the poultry industry [1, 2]. Infectious bronchitis is caused by infectious bronchitis virus (IBV), a gammacoronavirus with a single-stranded positive sense RNA genome [3]. Newcastle disease is caused by virulent strains of Newcastle disease virus (ND ...

We investigated the kinetics of vaccine (A20 and Serva) and wild-type (Class 9) infectious laryngotracheitis virus (ILTV) strains in dust samples after challenge as part of experiments investigating the level of protection provided by variable initial vaccination coverage against the adverse effects of virulent challenge.Two isolator studies using day-old Cobb broiler chickens were conducted to te ...

Necrotic enteritis (NE) and coccidiosis are the two major economically important enteric diseases of commercial broiler chickens. Coccidiosis predisposes birds to NE by causing physical damage to the gut epithelium and triggering inflammation and immunosuppression which enhances the growth and proliferation of pathogenic Clostridium perfringens (Park et al., 2008). This study was designed to inves ...

With the growing popularity of free range production systems, the incidence of helminth infections has increased in commercial poultry farms in Australia. Adequate control can only be maintained by regular application of commercial anthelmintics. Until very recently, levamisole (LEV) and piperazine (PIP) were the only registered chemicals to treat nematode infections in chickens with no published ...

Excreta egg counting techniques can provide valuable information for assessing flock infection levels, selecting nematode resistant chicken breeds and for determining anthelmintic efficacy. Although the Modified McMaster (MDM) method has been used for a long time, it is generally considered to have low sensitivity and precision (Das et al., 2020). The Mini-FLOTAC (MF) is a more recently developed ...

Infectious laryngotracheitis (ILT) caused by infectious laryngotracheitis virus (ILTV), is a highly contagious upper respiratory disease of poultry causing great economic losses to the chicken industry. New strains have been reported to emerge due to recombination of vaccine and field strains, some of them replacing less virulent strains because of their high virulence. The present study aimed to ...

Dust found in poultry housing is a complex substance most likely comprised of a mixture of excreta, feather, feed and bedding material. Exposure to poultry dust can impair the health of both poultry and poultry farmworkers as it serves as a medium for survival and spread of pathogenic microorganisms and inhalation of respirable particles and toxins (Just et al. 2009; Viegas et al. 2013). It has al ...

Infectious laryngotracheitis (ILT), caused by Gallid herpesvirus type 1, is a highly contagious upper respiratory and conjunctival disease of poultry. The virus (ILTV) is thought to exit the host in respiratory aerosols and enter by inhalation of these. High levels of ILTV DNA have been detected in excreta, dust, blood or plasma and in various organs outside the respiratory tract; raising the poss ...

Free-range layer pullets are typically reared indoors within Australia, but adult layers go outdoors which might cause poorer adaptation due to the mismatch between rearing and laying environments. Indoor enrichments may optimise physical development of pullets and subsequent welfare as adult free-range hens (Campbell et al., 2019). In the outdoor environment, hens may have greater opportunities f ...