Janet Roser

Janet Roser

Position Title
Professor of Animal Science

Department of Animal Science, College of Agricultural and Environmental Sciences

2239 Meyer

Profile Introduction

Endocrine/paracrine/autocrine regulation of testicular function in the stallion and boar and ovarian function in the mare.

Research Interests

Hormone Regulation of Reproductive Function

Endocrine/paracrine/autocrine regulation of testicular function in the stallion and boar and ovarian function in the mare.

Grad Group Affiliations

  • Animal Biology
  • Comparative Pathology (Vet Med)

Specialties / Focus

  • Reproductive Physiology


  • ANS 15 Horse Husbandry, Winter
  • ANS 115 Horse Production and Management, Fall
  • ANS 127 Advanced Equine Reproduction, Spring


  • Roser Lab
    • Lil Sibley: research assistant

Field Sites

  • Department of Animal Science Horse Barn

Professional Societies

  • Society for the Study of Reproduction


  • 1968 BS University of Vermont
  • 1978 MS University of California, Davis
  • 1982 PhD University of California, Davis


King, S.S, Campbell, A.G., Dille, E.A. Roser, J.F., Murphy, L.L., Jones, K.L. 2005. Dopamine receptors in equine ovarian tissues. Domestic Animal Endocrinology. 28:405-415.

Hess,M.F. , Roser, J.F. 2005. A comparison of the effects of equine luteinizing hormone (eLH), equine growth hormone (eGH) and human recombinant insulin-like growth factor (hrIGF-I) on steroid production in cultured equine Leydig cells during sexual maturation. Animal Reprod Science. 89:7-19.

At-Taras, E.E., Conley, A.J., Berger, T., Roser, J.F. 2006. Reducing estrogen synthesis does not affect gonadotropin secretion in the developing boar. Biology Reproduction. Sep 14; [Epub ahead of print].

Vanderwall, D.K., Woods, G.L., Roser, J.F., Schlafer, D.H., Sellon, D.C., Tester, D.F., White, K.L. 2006. Equine Cloning: applications and outcomes. Reproduction, Fertility and Development. 18: 91-98.

Roser, J.F. 2001. Endocrine and paracrine control of sperm production in stallions. Anim Reprod Sci.68: 139-51.

Hess, M.F., Roser, J.F. 2003. Immunocytochemical localization of cytochrome P450 aromatase in the testis of prepubertal, pubertal and postpubertal horses. Theriogenology 61:293-299.

Walters, K.W., Roser, J.F., Anderson, G.B. 2001. Maternal-conceptus signaling during early pregnancy in the mare: Oestrogen and insulin-like growth factor-I. Reproduction. 121: 331-338.

Motton DD and JF Roser. 1997. HCG Blinding to the testicular LH receptor is similar in fertile, subfertile, and infertile stallions. J Androl. 18:411-416

Stewart BL and JF Roser. 1998. Effects of age, season, and fertility status on plasma and intratesticular inhibin concentrations in stallions. Domestic Animal Endocrinology. 15:129-139

Jennings, M.W., Boime, I., Daphna-Iken, D., Jablonka-Shariff, A., Conley, A.J., Colgin, M.,Bidstrup, L.A., Meyers-Brown, G.A., Famula, T.R., Roser, J.F. 2009. The efficacy of recombinant equine follicle stimulating hormone (reFSH) to promote follicular growth in mares using a follicular suppression model. Animal Reproduction Science 116: 291-307..

Yoon, MH, Boime, I, Colgin M., Niswender K.D., King, S.S., Alvarenga, M., Jablonka-Shariff, A., Pearl, C.A., Roser, J.F. 2007. The efficacy of a single chain recombinant equine luteinizing hormone (reLH) in mares: Induction of ovulation, hormone profiles, and inter-ovulatory intervals. Domsetic Animal Endocrinology. 33:470-9.

Roser, J.F. 2008. Regulation of testicular function in the stallion: an intricate network of endocrine, paracrine and autocrine systems. Animal Reproduction Science. 107:179-196.

Meyers-Brown G.A., McCue, PM, Niswender, KD, Squires, E.L., DeLuca C.A., Bidstrup, L.A., Colgin, M., Famula, T.R., Roser, J.F. 2010. Superovulation in mares using recombinant equine follicle stimulating hormone (reFSH): Ovulation rates, embryo retrieval and hormone profiles. Journal of Equine Veterinary Science. 30: 560-568.

Yoon, M.J., Roser, J.F. 2010 Insulin-like growth factor-I (IGF-I) protects cultured equine Leydig cells from undergoing apoptosis. Animal Reproduction Science. 122:353-358.

Roser, J.F. 2011. Diagnostics and therapeutics for stallions with declining fertiltiy In: McKinnon AO, Squires EL, Vaala WE and Varner DD (Eds.), Equine Reproduction, 2nd edition, Wiley (Blackwell Pub), NJ pp . 1435-1447.

Meyers-Brown, G., Bidstrup, L.A., Famula, T.R., Colgin, M., Roser, J.F. 2011. Treatment with recombinant equine follicle stimulating hormone (reFSH) followed by recombinant equine luteinizing hormone (reLH) increases embryo recovery in superovulated mares. Animal Reproduction Science 128:52-59.

Berger, T., Kentfield, L.M., Roser, J.F., Conley, A.J. 2012. Stimulation of Sertoli cell proliferation: Defining the response interval to an inhibitor of estrogen synthesis in the boar. Reproduction. Feb 24 [Epub ahead of print].