Animal and Veterinary Sciences Graduate Faculty

Dr. Timothy Bowden

Assistant Professor of AquacultureBowden

Degree: Ph.D. 1999, University of Aberdeen, Scotland
Phone: 207.581.2772
Location: 237 Hitchner Hall
Website:  Aquatic health laboratory

Professional Interests: Disease resistance in oysters and other shellfish, effective treatments for shellfish disease, immune function of fish

Teaching: AVS 211 Introduction to Aquaculture

Research: Dr. Bowden’s current research interests cover a number of areas.  Host/pathogen interactions – how does a pathogen gain entry into an aquatic animal host and how does that host respond. He is involved with both vertebrate and invertebrate species and with bacterial, viral and parasite pathogens. Basic immunology of aquatic animals especially invertebrate animals such as; oysters, razor clams, lobsters and seahorses. He has projects looking at basic immune function in novel species such as the razor clam and seahorse.    Environmental impacts on aquatic animals, with a special focus on health impacts. How does an aquatic animal cope with changes in its environment such as temperature, salinity or acidity. He has a special interest in biological clocks and seasonality, an issue of specific importance to more temperate species. It is clear that animal physiology and behavior are affected by the change in season, but how does this impact their health. How do they sense the changing season? What is the method of molecular transduction that responds to an environmental change and leads to a physiological change in the animal? Finally, he has an interest in ageing in aquatic animals. What happens when an animal ages, especially from a health and immunology point of view? Can an animal possibly recover from senescence?

Dr. Robert Causey

Associate Professor of Animal and Veterinary Sciences

Degree: Ph.D. 1995, Louisiana State University; DVM 1989 University of Minnesota
Phone: 207.581.2782
Location: 207 Rogers Hall
Website: Robert Causey resources

Professional Interests: Equine reproduction, infectious diseases, anatomy,biomechanics, and economic sustainability of equine farms in Maine 

Teaching: AVS 196 Introduction to Equine Cooperative, AVS 303 Equine Management Cooperative, AVS 393 Training the Standardbred Horse, AVS 397 Equine Internship

Dr. Sue Ishaq

Assistant Professor of Animal and Veterinary Sciences

Degree: Ph.D. 2015, University of Vermont
Phone: 207.581.2770
Location: 108 Rogers Hall

Professional Interests: The majority of my work focuses on host-associated microbiomes and understanding lifestyle circumstances which select for communities. I want to know how we can recover a stable microbial community in humans and animals which have already gotten to the point of chronic microbial community dysfunction and disease. I have three overarching research goals: 1) to better characterize microbiomes using cutting-edge technology, 2) to use this characterization to determine the relation of community structure to system functionality and homeostasis in simplified models, and 3) to develop prevention and intervention therapies which can return a perturbed microbiome back into balance in vivo.

Teaching: TBD

Recent Publications:

  1. Ishaq, S.L., Lachman, M.M., Wenner, B.A., Baeza, A., Butler, M., Gates, E., Olivo, S., Buono Geddes, J., Hatfield, P., Yeoman, C.J. 2019. Pelleted-hay alfalfa feed increases sheep wether weight gain and rumen bacterial richness over loose-hay alfalfa feed. PLoS ONE 14(6): e0215797.
  2. Ishaq, S.L., Page, C.M., Yeoman, C.J., Murphy, T.W., Van Emon, M.L., Stewart, W.C. 2019. Zinc amino acid supplementation alters yearling ram rumen bacterial communities but zinc sulfate supplementation does not. Journal of Animal Science 97(2):687–697.
  3. 3. Velazquez S., Griffiths W., Dietz L., Horve P., Nunez, S., Hu, J., Shen, J., Fretz, M., Bi, C., Xu, Y., Van Den Wymelenberg, K.G., Hartmann, E.M., Ishaq, S.L. 2019. From one species to another: A review on the interaction of chemistry and microbiology in relation to cleaning in the built environment. Indoor Air. Accepted.
  4. 4. Horve, P.F., Lloyd, S., Mhuireach, G.A., Dietz, L., Fretz, M., MacCrone, G., Van Den Wymelenberg, K., Ishaq, S.L. 2019. Building Upon Current Knowledge of Indoor Microbiology to Construct the Next Era of Research into Microorganisms, Health, and the Built Environment. Journal of Exposure Science and Environmental Epidemiology, Healthy Buildings special issue. Article.
  5. 5. Garcia-Mazcorro, J.F., Ishaq, S.L., Rodriguez-Herrera, M.V., Garcia-Hernandez, C.A., Kawas, J.R., Nagaraja, T.G. 2019. Review: Are there indigenous Saccharomyces in the digestive tract of livestock animal species? Implications for health, nutrition and productivity traits. Animal 1-9. doi:10.1017/S1751731119001599
  6. Yeoman, C.J., Ishaq, S.L., Bichi , E., Olivo, S., Lowe, J., Aldridge, B.M. 2018. Biogeographical Differences in the Influence of Maternal Microbial Sources on the Early Successional Development of the Bovine Neonatal Gastrointestinal tract. Scientific Reports 8: 3197.

Dr. Pauline Kamath

Assistant Professor of Animal HealthKamath

Degree:  Ph.D. 2011, University of California, Berkeley
Phone: 207.581.2935
Location: 342 Hitchner Hall
Website: coming soon

Professional Interests: Disease ecology and evolution; wildlife conservation; genomics; population genetics; phylogenetics

Teaching: AVS 249 Laboratory and Companion Animal Science, AVS 477 Zoonoses and Animal Health

Research: My research focuses on understanding infectious disease transmission dynamics and host-pathogen adaptation in wildlife disease systems, particularly those involving an interface with domestic species. I specifically apply genetic/genomic and statistical approaches to address diverse research questions, including: (1) How do pathogens influence host genetic diversity? (2) What is the genetic basis for heterogeneity in host susceptibility? (3) Can disease transmission dynamics be quantified across hosts, space and time? (4) What are the eco-evolutionary drivers of disease transmission and spillover into new hosts, and can these factors be used to predict future spread? This work involves both field and laboratory components, and multidisciplinary analyses that integrate genetic information with ecological, immunological, and epidemiological data. Current wildlife disease systems include brucellosis in wildlife and livestock of the Greater Yellowstone Ecosystem, Mycoplasma ovipneumoniae in wild and domestic sheep and goats, anthrax in plains zebra of southern Africa, and avian pathogens in migrating and resident birds along the Palearctic-African Flyway.  Other research interests include the investigation of population trends, structure, connectivity, and hybridization in threatened and invasive species.

Dr. Anne Lichtenwalner

Associate Professor of Animal and Veterinary Sciences, Extension LichtenwalnerVeterinarian and Director University of Maine Animal Health Laboratory

Degree: Ph.D. 1995, University of Idaho; DVM 1989, Oregon State University
Phone: 207.581.2789
Location: 136 Hitchner Hall

Professional Interests: Infectious diseases of livestock, poultry and wildlife

Dr. David Marcinkowski

Associate Professor of Animal and Veterinary Sciences  andMarckinkowski
Extension Dairy Specialist

Degree: Ph.D. 1982, The Ohio State University
Phone: 207.581.2740
Location: 132A Hitchner Hall
Website: Livestock site

Professional Interests: Dairy cattle

Teaching: AVS 346/347 Dairy Cattle Technology and Laboratory, AVS 371  University Dairy Cooperative,  AVS 466  Livestock Feeds and Feeding

Research: I do not have a formal research appointment however my research interests include; evaluating the behavior dairy animals in dairy facilities and evaluating management changes on farm profitability.

Dr. Juan Romero

Assistant Professor of Animal Nutrition11010001

Degree: Ph.D. 2013, University of Florida
Phone: 207.581.2925
Location: 203 Rogers Hall

Professional Interests: forage quality and conservation, ruminant nutrition, animal systems microbiota, and enzymology.

Teaching: AVS 145/146 Introduction to Animal Science and Laboratory, AVS 446 Forage Science and Range Management

Research: Dr. Romero aims to expand the understanding of the factors that affect forage quality and conservation in order to develop novel additives that will improve profitability of livestock producers. Specifically, his program focuses on the methodological use of fungal enzymes to solve specific issues in silage production and the development of biologically-based additives to enhance the stability of conserved forages. In order to better understand the processes that affect silage and hay production, Dr. Romero not only relies on well-established agronomic and nutritional techniques but also on next-generation sequencing and proteomics to push the envelope by developing novel research hypotheses. Dr. Romero pioneered the use of proteomics to compare commercially-available fibrolytic enzymes in animal nutrition, suggesting for the first time specific enzymes involved in improving ruminal fiber digestibility, and the use of next generation sequencing to assess the corn and oats silage microbiome. Dr. Romero has also used next generation sequencing to describe bacterial communities in the liquid and solid fractions of the rumen under the influence of different biological additives.

Juan Romero’s Google Scholar page


Dr. James Weber

Associate Professor and Animal and Veterinary SciencesWeber

Degree: Ph.D. 1992, University of Idaho; DVM 1994, Washington State University
Phone: 207.581.2774
Location: 130B Hitchner Hall

Professional Interests:

Teaching: AVS 203 Equine Management, AVS 231 Sheep Management Cooperative, AVS 437 Animal Diseases, AVS 480 Physiology of Reproduction