Gary D Butcher

Gary D Butcher,


Department: Large Animal Clinical Sciences
Business Phone: (352) 294-4390
Business Email:


Person of the Year, Recognition for Outstanding Service , Recognition for Outstanding Service to the Florida Poultry Industry
2003 · Florida Poultry Federation

Research Profile

The primary focus of Dr. Butcher’s extension program involves providing technical support to the Florida Poultry Industry and related avian industries. Activities include on-farm visitations, poultry necropsies and sample evaluations (histopathology & serology), and consultations. The program at the University of Florida is primarily to provide direct support to the industry in Florida; however, international work in support of IFAS’ International Programs Mission and the University’s Mission toward globalization is undertaken. A statewide Salmonella monitoring program has been developed in association with the Florida Poultry Federation. This proactive program permits identification of Salmonella-infected farms and provides recommendations on eradication procedures. Research efforts have been directed toward recombinant vaccines to combat poultry diseases including Newcastle disease, Gumboro disease, Marek’s disease, and infectious laryngotracheitis. Vectors have included virus and plants. Work is also being conducted on transgenic chickens.


Complete Genome Sequence of Campylobacter hepaticus Strain UF2019SK1, Isolated from a Commercial Layer Flock in the United States.
Microbiology resource announcements. 10(12) [DOI] 10.1128/MRA.01446-20. [PMID] 33766908.
Burden of exposure to infectious bursal disease virus, infectious bronchitis virus, Newcastle disease virus, Mycoplasma gallisepticum, and intestinal parasites in introduced broiler chickens on the Galapagos.
PloS one. 13(9) [DOI] 10.1371/journal.pone.0203658. [PMID] 30248128.
Effect of antibiotic growth promoters on broiler performance, intestinal growth parameters, and quantitative morphology.
Poultry science. 85(3):476-85 [PMID] 16553279.
View on: PubMed
Effect of dietary zinc source and method of oral administration on performance and tissue trace mineral concentration of broiler chicks.
Journal of animal science. 77(7):1788-99 [PMID] 10438026.
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Response of broiler breeder females to feed restriction below recommended levels. 3. Characterizing the onset of sexual maturity.
Poultry science. 72(11):2044-51 [PMID] 8265493.
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Subclinical infectious bursal disease in an integrated broiler production operation.
Journal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc. 4(4):406-11 [PMID] 1333817.
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Detection of antibodies to Mycoplasma gallisepticum in egg yolk versus serum samples.
Journal of clinical microbiology. 29(12):2901-3 [PMID] 1757571.
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Histomoniasis in Leghorn pullets on a Florida farm.
Avian diseases. 35(3):621-4 [PMID] 1953586.
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Mycoplasma gallisepticum as a model to assess efficacy of inhalant therapy in budgerigars (Melopsittacus undulatus).
Avian diseases. 35(4):834-9 [PMID] 1786013.
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Comparisons of the genomic RNA of Arkansas DPI embryonic passages 10 and 100, Australian T, and Massachusetts 41 strains of infectious bronchitis virus.
Avian diseases. 34(2):253-9 [PMID] 2164385.
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Mycobacterium infection in a gray-cheeked parakeet.
Avian diseases. 34(4):1023-6 [PMID] 2282008.
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Pathogenesis of H13 nephropathogenic infectious bronchitis virus.
Avian diseases. 34(4):916-21 [PMID] 2177977.
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An outbreak of nephropathogenic H13 infectious bronchitis in commercial broilers.
Avian diseases. 33(4):823-6 [PMID] 2559709.
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Comparisons of the structural proteins of avian infectious bronchitis virus as determined by western blot analysis.
Viral immunology. 2(3):221-7 [PMID] 2560918.
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Relationship between delayed onset of egg production and involution of the bursa of Fabricius in White Leghorn chickens.
Avian diseases. 33(2):361-4 [PMID] 2751567.
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1992 · American College of Poultry Veterinarians
PhD – Avian Virology
1987 · Texas A&M University
MS – Avian Pathology
1984 · Purdue University
1981 · Texas A&M University
BS – Biomedical Science
1980 · Texas A&M University

Teaching Profile

Courses Taught
VEM5315C Poultry Med Practicum
VEM5504 Prevent/Productn Med
VME4103 Livestock Health/Disease Prevention
VME6905 Problems in Veterinary Medical Sciences
VEM5041 Animal Welfare/Ethics

Contact Details

(352) 294-4390

University of Florida


As part of both the Institute of Food and Agricultural Sciences and UF Health, Veterinary Medicine is dedicated to advancing animal, human and environmental health through teaching, research, extension and patient care.



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