Poultry Diseases

Pigeon Canker

G. D. Butcher

Chicken Anemia Agent (CAA)

Gary D. Butcher

Infectious Bursal Disease (Gumboro) in Commercial Broilers

Gary D. Butcher and Richard D. Miles

Infectious Bronchitis Virus: Classical and Variant Strains

Gary D. Butcher, David P. Shapiro, and Richard D. Miles

Heat Stress Management in Broilers

Gary D. Butcher and Richard Miles

Common Poultry Diseases

G. D. Butcher, J. P. Jacob, and F. B. Mather

This document is about common diseases affecting poultry, with a focus on respiratory and non-respiratory conditions. It outlines the symptoms, transmission methods, treatment options, and prevention strategies for a wide range of illnesses that impact various bird species, including chickens, turkeys, ducks, and game birds. The information is intended to support poultry health management and biosecurity practices. Original publication date May, 1999.

Investigating Vaccination Failure in Poultry Flocks

Gary D. Butcher and Mojtaba Yegani

Diagnosis, Prevention, and Control of French Molt

Gary D. Butcher and Richard M. Miles

The Avian Immune System

Gary D. Butcher and Richard D. Miles

St. Louis Encephalitis—The Role of Chickens

Gary D. Butcher and Richard Miles

Prevention and Control of Fowl Pox in Backyard Chicken Flocks

Gary D. Butcher and Fred Rossi

Improved Aviculture Management May Prevent Candidiasis in Birds

Gary D. Butcher and Richard D. Miles

Knemidokiptic Mange in Pet Birds: Scaly Face and Scaly Leg Disease

Gary D. Butcher and Curtis Beck

Infectious Bronchitis and Its Effect on Egg Production and Egg Quality

Gary D. Butcher and Richard Miles

Mycoplasma Gallisepticum - A Continuing Problem in Commercial Poultry

Gary D. Butcher

This document is about Mycoplasma gallisepticum (MG), which remains a persistent challenge in the commercial poultry industry worldwide, despite eradication efforts in grandparent stock and turkeys. The organism, fragile outside the host, causes long-term respiratory infections in chickens, complicating control in multi-age flocks. Original publication date May 2002.

Avian Influenza in Poultry

J. P. Jacob, G. D. Butcher, F. B. Mather, and R. D. Miles

This document provides an overview of avian influenza in poultry, detailing its history, clinical signs, transmission, and prevention. Avian influenza is a viral disease affecting birds' respiratory, digestive, and nervous systems, with varying pathogenicity. Original publication date April 1998.

Myeloid Leukosis (J-virus)—An International Broiler Industry Concern

Gary D. Butcher, and Richard D. Miles

Factors to Consider in Serologic Testing for Mycoplasma gallisepticum (MG) and Mycoplasma synoviae (MS)

Gary D. Butcher

Newcastle and Infectious Bronchitis Vaccine Reactions in Commercial Broilers

Gary D. Butcher, Richard D. Miles, and Amir H. Nilipour

Feed Passage in Broilers—A Complex Problem

Gary D. Butcher, Amir H. Nilipour, and Richard D. Miles

Avian Goiter (Thyroid Hyperplasia or Dysplasia)

Gary D. Butcher and Curtis C. Beck

The Role of Humans in Poultry Disease Outbreaks

Gary Butcher and Mojtaba Yegani

Recognizing Immunosuppressive Diseases in Commercial Poultry

Gary D. Butcher and Mohamed Hossiny

This publication describes common causes of immune suppression in commercial poultry. It aims to instruct those involved with poultry in evaluation of poultry flocks to determine if immunosuppressive diseases are causing losses in those flocks. Written by Gary D. Butcher and Mohamed Hossiny, and published by the UF College of Veterinary Medicine, UF/IFAS Extension, July 2025.

What Backyard Flock Owners Need to Know about Bird Flu (Influenza H5N1)

A. McLeod-Morin, B. D. Anderson, G. Morris, C. Sanders, C. Larson, R. Telg, and A. Henson

Bird flu is caused by the H5N1 subtype of influenza A virus. Among migratory birds and poultry, this virus can be highly contagious and cause severe disease and death. Biosecurity and proper hygiene significantly reduce this risk. This publication aims to help owners of backyard flocks protect their birds and identify possible signs of influenza H5N1 infection. Written by A. McLeod-Morin, B. D. Anderson, G. Morris, C. Sanders, C. Larson, R. Telg, and A. Henson, and published by the UF/IFAS Department of Animal Sciences, September 2025.

Fowl Adenovirus Hepatitis (IBH and HHS): An Emerging Poultry Disease

Gary D. Butcher and Mohamed Hossiny

The intended audience for this publication is commercial poultry producers and poultry veterinarians. This publication aims to provide an update and summary of fowl adenovirus hepatitis. Written by Gary D. Butcher and Mohamed Hossiny, and published by the UF College of Veterinary Medicine, UF/IFAS Extension, July 2024.