Devin Holman, Ph.D.

Current research and/or projects

  • Understanding the dynamics of the swine gut microbiome in response to perturbations and weaning.
  • Sow milk microbiome and resistome
  • Developing antimicrobial alternatives for use in swine production.
  • Nasopharyngeal microbiome of beef cattle and the development of bovine respiratory disease.

Professional activities / interests

Associate Editor, Canadian Journal of Animal Science. 2023-present.

Editorial Board Member, Applied and Environmental Microbiology. 2020-present. 

Vice-chair, Lacombe Research and Development Centre Animal Care Committee. 2021-present.

Western Director, Canadian Society of Animal Science. 2022-present.

Chair, Lacombe Research and Development Centre Animal Care Committee, 2018-2021.

Education and awards

Ph.D., Microbiology, McGill University

M.Sc., Food Microbiology, Dalhousie University

B.Sc. (Hons.), Environmental Biology, Nova Scotia Agricultural College (Dalhousie University)                       

International experience and/or work

ORISE Postdoctoral Fellow, United States Department of Agriculture, National Animal Disease Center, Ames, IA, USA, 2016-17.

Key publications

  1. Holman, D.B., Gzyl, K.E., Kommadath, A. (2023). The gut microbiome and resistome of conventionally vs. pasture-raised pigs. Microbial genomics, [online] 9(7),

    2023 - View publication details

  2. Yang, X., Wang, H., Hrycauk, S., Holman, D.B., Ells, T.C. (2023). Microbial Dynamics in Mixed-Culture Biofilms of Salmonella Typhimurium and Escherichia coli O157:H7 and Bacteria Surviving Sanitation of Conveyor Belts of Meat Processing Plants. Microorganisms, [online] 11(2),

    2023 - View publication details

  3. Liu, X.; Floate, K.D.; Gorzelak, M.A.; Holman, D.B.; Hrycauk, S.; Kubota, H.; Lupwayi, N.; Neilson, J.A.D.; Ortega Polo, R.; Petri, R.M.; Tran, L.; Wang, H.; Wilches, D.; Yang, X.; Zorz, J.; Guarna, M.M. Prairie Agroecosystems: Interconnected Microbiomes of Livestock, Soil and Insects. Agriculture 2023, 13, 326.

    2023 - View publication details

  4. Jones, T.H., Service, C., Hrycauk, S., Gzyl, K.E., Holman, D.B. (2023). Salmonella Prevalence is Low in Deep Tissue Lymph Nodes of Hog Carcasses from a Pork Processing Plant in Alberta, Canada. Food Protection Trends (FPT), [online] 43(5), 383-390.

    2023 - View publication details

  5. Zhang, P., Ruan, E., Holman, D.B., Yang, X. (2022). Effects of a Carnobacterium maltaromaticum strain at natural contamination levels on the microbiota of vacuum-packaged beef steaks during chilled storage. Food Science and Technology - LWT, [online] 168

    2022 - View publication details

  6. Holman, D.B., Kommadath, A., Tingley, J.P., Abbott, D.W. (2022). Novel Insights into the Pig Gut Microbiome Using Metagenome-Assembled Genomes. Microbiology Spectrum, [online] 10(4),

    2022 - View publication details

  7. Holman, D.B., Klima, C.L., Gzyl, K.E., Zaheer, R., Service, C., Jones, T.H., McAllister, T.A. (2021). Antimicrobial Resistance in Enterococcus Spp. Isolated from a Beef Processing Plant and Retail Ground Beef. Microbiology Spectrum, [online] 9(3),

    2021 - View publication details

  8. Holman, D.B., Gzyl, K.E., Mou, K.T., Allen, H.K. (2021). Weaning age and its effect on the development of the swine gut microbiome and resistome. mSystems, [online] 6(6),

    2021 - View publication details

  9. Yang, X., Wang, H., Badoni, M., Zawadski, S., McLeod, B., Holman, D., Uttaro, B. (2020). Effects of a novel three-step sous-vide cooking and subsequent chilled storage on the microbiota of beef steaks. Meat Science, [online] 159

    2020 - View publication details

  10. Klima, C.L., Holman, D.B., Ralston, B.J., Stanford, K., Zaheer, R., Alexander, T.W., McAllister, T.A. (2019). Lower Respiratory Tract Microbiome and Resistome of Bovine Respiratory Disease Mortalities. Microbial Ecology, [online] 78(2), 446-456.

    2019 - View publication details

  11. Holman, D.B., Yang, W., Alexander, T.W. (2019). Antibiotic treatment in feedlot cattle: A longitudinal study of the effect of oxytetracycline and tulathromycin on the fecal and nasopharyngeal microbiota. Microbiome, [online] 7(1),

    2019 - View publication details

  12. Holman, D.B., Gzyl, K.E. (2019). A meta-analysis of the bovine gastrointestinal tract microbiota. FEMS Microbiology Ecology, [online] 95(6),

    2019 - View publication details

  13. Holman, D.B., Bearson, B.L., Allen, H.K., Shippy, D.C., Loving, C.L., Kerr, B.J., Bearson, S.M.D., Brunelle, B.W. (2019). Chlortetracycline enhances tonsil colonization and fecal shedding of multidrug-resistant Salmonella enterica serovar typhimurium DT104 without major alterations to the porcine tonsillar and intestinal microbiota. Applied and Environmental Microbiology, [online] 85(4),

    2019 - View publication details

  14. Holman, D.B., Timsit, E., Booker, C.W., Alexander, T.W. (2018). Injectable antimicrobials in commercial feedlot cattle and their effect on the nasopharyngeal microbiota and antimicrobial resistance. Veterinary Microbiology, [online] 214 140-147.

    2018 - View publication details

  15. Huang, Q., Holman, D.B., Alexander, T., Hu, T., Jin, L., Xu, Z., McAllister, T.A., Acharya, S., Zhao, G., Wang, Y. (2018). Fecal microbiota of lambs fed purple prairie clover (Dalea purpurea Vent.) and alfalfa (Medicago sativa). Archives of Microbiology, [online] 200(1), 137-145.

    2018 - View publication details

  16. Holman, D.B., Timsit, E., Amat, S., Abbott, D.W., Buret, A.G., Alexander, T.W. (2017). The nasopharyngeal microbiota of beef cattle before and after transport to a feedlot. BMC Microbiology, [online] 17(1),

    2017 - View publication details

  17. Holman, D.B., Hao, X., Topp, E., Yang, H.E., Alexander, T.W. (2016). Effect of co-composting cattle manure with construction and demolition waste on the archaeal, bacterial, and fungal microbiota, and on antimicrobial resistance determinants. PLoS ONE, [online] 11(6), 1-21.

    2016 - View publication details

  18. Timsit, E., Workentine, M., Schryvers, A.B., Holman, D.B., van der Meer, F., Alexander, T.W. (2016). Evolution of the nasopharyngeal microbiota of beef cattle from weaning to 40 days after arrival at a feedlot. Veterinary Microbiology, [online] 187 75-81.

    2016 - View publication details

  19. Holman, D.B., Timsit, E., Alexander, T.W. (2015). The nasopharyngeal microbiota of feedlot cattle. Scientific Reports, [online] 5

    2015 - View publication details

  20. Holman, D.B., McAllister, T.A., Topp, E., Wright, A.D.G., Alexander, T.W. (2015). The nasopharyngeal microbiota of feedlot cattle that develop bovine respiratory disease. Veterinary Microbiology, [online] 180(1-2), 90-95.

    2015 - View publication details

Research facility

6000 C and E Trail
Lacombe, AB T4L 1W1


• American Society for Microbiology
• Canadian Society of Microbiologists

• Canadian Society of Animal Science