Gross and Histologic Diagnosis of Retrograde Yolk Inhalation in Poultry (2480_2)
Poultry Posters |  Diagnostics
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John Roberts DVM
Thompson Bishop Sparks State Lab

John Roberts is a native of Lexington, Kentucky and former Peace Corps Nepal volunteer who graduated from Auburn University, College of Veterinary Medicine in 1994. Prior to entering the field of veterinary pathology he was a mixed animal vet in Kentucky, West Virginia and Oregon. He completed a post-doctorate fellowship in anatomic pathology from the University of Kentucky in 2003 and became a Diplomat of the American College of Veterinary Pathology in 2005. While at University Kentucky he was the primarily person involved in investigation of wild bird die-offs, including a two year West Nile Virus study. After that he spent four years as an assistant professor at University of Florida, College of Veterinary Medicine, and during that time traveled back to Nepal to teach a course on highly pathogenic avian influenza. In 2008 he joined the Alabama Dept of Agriculture and Industry serving as a mammalian pathologist and toxicology section head. In 2012 he took a job as associate pathologist at the Smithsonian Institute, National Zoo in Washington, D.C. but returned after a year to rejoin the State of Alabama. Since returning to Alabama he has been employed as an avian diagnostic specialist at the Thompson Bishop Sparks State Diagnostic Lab and has settled in Auburn with his two children and wife Jennifer who is a small animal veterinarian.

Presentation Info

CE Credit(s): 0.00
CE Level: 2


Retrograde yolk inhalation (RYI) was diagnosed in commercial laying and broiler breeder hens, backyard hens and quail hens. Clinical presentation ranged from acute death with minimal inflammation to chronic regional granulomatous pneumonia. This disease may be an unrecognized component of several syndromes and infectious diseases of commercial hens.