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Animal Sciences Department

Animal Sciences Department

Dr. John Bromfield

Associate Professor — Reproductive Biology

Dr. Bromfield’s laboratory focuses on infection & immunity in the female reproductive tract and its impact on fertility. Using state-of-the-art technologies located within the Department of Animal Sciences, we aim to understand the molecular and cellular mechanisms which result in infertility of dairy cows following infection of the uterus, known as metritis. The laboratory focuses on how uterine infection impacts the ovary, particularly the oocyte and follicle.

Academic Positions Since Final Degree:

  • 2021-Current; Associate Professor of Physiology. Department of Animal Sciences, University of Florida.
  • 2014-2021; Assistant Professor of Physiology. Department of Animal Sciences, University of Florida.
  • 2012-2014; Postdoctoral fellow. Department of Obstetrics, Gynaecology and Women’s Health, University of Missouri-Columbia.
  • 2009-2012; Research Officer. Institute of Life Science, School of Medicine, Swansea, UK.
  • 2008-2009; Lead Teaching Assistant. Frontiers in Reproduction course. Marine Biological Laboratories, Woods Hole, MA.
  • 2007-2009; Postdoctoral fellow. Department of Molecular and Integrative Physiology, Kansas University Medical Centre.
  • 2006-2007; NHMRC Postdoctoral Research Officer. Department of Obstetrics and Gynaecology, University of Adelaide, Australia.


  • Research

    Dr. Bromfield's laboratory focuses on infection and immunity in the female reproductive tract, in particular, a specific interest in uterine infection in dairy cows. Approximately 40% of all dairy cows acquire a uterine infection following calving resulting in pain, infertility, and reduced milk production resulting in an annual cost to the US dairy industry of $650 million. Using molecular and cellular techniques the aim is to elucidate the mechanisms involved in the innate immune response to invading pathogens in the uterus resulting in infertility. The Gram-negative bacteria E. coli, comprising a lipopolysaccharide (LPS) cell wall, is the primary causes of clinical metritis in dairy cows. The innate immune response to LPS is orchestrated through the Toll-like receptor (TLR) pathway. Interestingly, dairy cows with uterine infections accumulate LPS in the ovarian follicle and initiates an inflammatory response by the ovarian granulosa cells. This response results in reduced oocyte quality while reducing the follicular reserve and can explain some level of infertility in cows with infections. The goal is to understand how LPS, and other bacterial components negatively impacts the ovary and oocyte. By understanding these mechanisms he will be able to intervene in dairy cows with infection and promote fertility and milk production. Secondary to infection and immunity Dr. Bromfield's lab has an active interest in improving oocyte cryopreservation and the developmental environment of the early embryo.

  • Teaching

    Dr. Bromfield currently teaches Reproductive Physiology and Endocrinology in Domestic Animals (ANS 3319C), Mammalian Endocrinology (ANS 6704), Physiology of Reproduction (ANS 6751C), and the Animal Molecular and Cellular Biology seminar series (ANS 6936).



Bldg 459, Shealy Drive
PO Box 110910
Gainesville, FL 32611
Phone: (352) 294-6991
Fax: (352) 392-5595
Personal Page

  • Education
    • 2002-2006; Ph.D. (Medicine), University of Adelaide, Australia.
    • 2001; BSc (Hons) – Reproductive Immunology, University of Adelaide, Australia.
    • 1998-2000; Bachelor of Science (Double major Biochemistry and Immunology), University of Adelaide, Australia.

  • Publications
  • Professional Service and Awards

    Professional Memberships

    • Society for the Study of Reproduction (SSR)
    • American Dairy Science Society (ADSA)
    • American Society of Animal Science (ASAS)
    • International Embryo Technology Society (IETS)
    • Frontiers in Reproduction Firbee

    Honors and Recognition

    • 2020; Excellence Awards for Assistant Professors, University of Florida
    • 2020; UF/IFAS Award of Excellence for Graduate Research-M.S.
    • 2016; Mentor of the Year, Department of Animal Sciences, University of Florida
    • 2013; University of Adelaide international exchange fellow.
    • 2010; Wales Obstetrics and Gynaecology Society communication prize.
    • 2009; International Society for Fertility Preservation communication prize.
    • 2005; Foetal and Neonatal Physiological Society, DSL Young Investigator Award.
    • 2005; Australian Foetal and Neonatal Physiology Workshop communication prize.