Contact Information
Extension: 53330 | Email: pmbart@ovc.uoguelph.ca
Areas of Interest
- Hormonal control of ovarian antral follicle development in domestic ruminants
- Ultrasonographic imaging of the reproductive organs in animal species
- Regulation and manipulation of sexual development in calves and lambs
- ARTs in ruminants and companion animals (IVM/IVF/IVC, hormonal ovarian superstimulation, AI and MOET)
- Development of farm animal models for amelioration of hormonal treatments in women
Current Graduate Students
Jennifer Giffin, B.Sc.H. (Guelph), M.Sc. (Guelph)
Testicular echotextural characteristics in prepubertal ram lambs: histomorphological and endocrine correlates in normal and accelerated sexual development.
- Ph.D. candidate
Razan Omer, B.Sc.H. (Guelph)
Relationships of ultrasonographic and magnetic resonance image attributes to testicular and ovarian follicular histomorphology.
- M.Sc. candidate
Kamila Skalski, B.Sc.H. (Western)
- MBS candidate
Tanya Baby, B.Sc.H. (Guelph)
Effects of progesterone on FSH secretion and follicular wave dynamics in cycling ewes.
- M.Sc. candidate - GRADUATED S'10
Stephan Botha, B.Sc. (Guelph)
Correlation between luteal blood flow and progesterone levels in Asian elephants.
- MBS candidate - GRADUATED S'12
Emily Callery, B.Sc. (Guelph)
The effects of lytic peptide conjugated to beta chorionic gonadotropin (bCG) on ovarian dynamics in ewes.
- M.Sc. candidate - GRADUATED F'08
Ivanka Candappa, B.Sc.H. (Guelph)
Assessing the suitability of using Cervidil® for inducing cervical dilation to facilitate artificial insemination and embryo transfer in ewes.
- M.Sc. candidate - GRADUATED S'10
Jennifer Giffin, B.Sc. (Guelph)
Morphological and haemodynamic determinants of testicular echotexture characteristics in peripubertal rams.
- M.Sc. candidate - GRADUATED W'10
Angus MacAulay, B.Sc. (Guelph)
Steroid hormones and their influence on the sex ratio of in-vitro produced bovine embryos.
- M.Sc. candidate - GRADUATED S'10
Bret McLeod, B.Sc.H. (Guelph)
The Effects of Gonadotropin Releasing Hormone Conjugated to a Cell Disrupting Peptide (Phor21), on Pituitary Function and Ovarian Dynamics in Ewes.
- M.Sc. candidate - GRADUATED S'09
Ana Maria Prieto, D.V.M. (Columbia)
Measurements of steroid hormones as a diagnostic and prognostic tool in porcine pregnancy.
- MBS candidate - GRADUATED S'11
Hailey Ruyter, B.Sc.H. (Guelph)
Analyses of hormonal profiles in relation to the pattern of antral follicular emergence during the menstrual cycle.
- M.Sc. candidate - GRADUATED S'10
Patricia Seaton, B.Sc. (Guelph)
Hormonal ovarian stimulation in ewes.
- M.Sc. candidate - GRADUATED S'10
Lisa Warren, B.Sc. (Guelph)
Non-invasive estimation of ovarian follicular reserve.
- M.Sc. candidate - GRADUATED S'09
Selected References
Candappa, I.B.R., Bartlewski, P.M. (2011). A review of advances in artificial insemination (AI) and embryo transfer (ET) in sheep, with the special reference to hormonal induction of cervical dilation and its implications for controlled animal reproduction and surgical techniques. The Open Reproductive Science Journal 3:162-175.
Baby, T.E., Bartlewski, P.M. (2011). Progesterone as the driving regulatory force behind serum follicle-stimulating hormone (FSH) concentrations and antral follicular growth in cyclic ewes. Reprod. Fertil. Dev. 23:303-310.
Bartlewski, P.M., Baby, T.E., Giffin, J.L. (2011). Reproductive cycles in sheep. Anim. Reprod. Sci. 124:259-268.
Ashkar, F.A., Semple, E., Schmidt, C.H., St. John, E., Bartlewski, P.M., King, W.A. (2010). Thyroid hormone supplementation improves bovine embryo development in vitro. Hum. Reprod. 25:334-344.
Sir, C., Bartlewski, P.M. (2010). Analyses of parental and seasonal influences on the synchrony of dexamethasone-induced lambing and lamb characteristics. Livestock Sci. 131:119-124.
Callery, E.C., Hansel, W., Bartlewski, P.M. (2010). The effects of a low therapeutic dose of betaCG fragment-lytic peptide conjugates on ovarian function and gonadotropin secretion in ewes: A randomized controlled trial. Reprod. Biol. 10:195-213.
Candappa, I.B.R., Bainbridge, H.C., Price, N.T., Hourigan, K.R., Bartlewski, P.M. (2009). A preliminary study on the suitability of CervidilÃ’ to induce cervical dilation for artificial insemination in ewes. Res. Vet. Sci. 87:204-206.
Wu, D., Barrett, D.M.W., Rawlings, N.C., Giffin, J.L., Bartlewski, P.M. (2009). Relationships of changes in ultrasonographic image attributes to ovulatory and steroidogenic capacity of large antral follicles in sheep. Anim. Reprod. Sci. 116:74-83.
Giffin, J.L., Franks, S.E., Rodriguez-Sosa, J.R., Hahnel, A., Bartlewski, P.M. (2009). A study of morphological and haemodynamic determinants of testicular echotexture characteristics in the ram. Exp. Biol. Med. 234:794-801.
Duggavathi, R., Bartlewski, P.M., Barrett , D.M.W., Bagu, E.T., Rawlings, N.C. (2008). Short- and long-term effects of unilateral ovariectomy in sheep: Causative mechanism. Biol. Reprod. 78:490-496.
Liu, X., Hart, E.J., Petrik, J.J., Nykamp, S.G., Bartlewski, P.M. (2008). Relationships between ultrasonographic image attributes, histomorphology and proliferating cell nuclear antigen (PCNA) expression of bovine antral follicles and corpora lutea ex situ. Reprod. Dom. Anim. 43:27-34.
Barrett, D.M.W., Duggavathi, R., Davies, K.L., Bartlewski, P.M., Bagu, E.T., Rawlings, N.C. (2007). Differential effects of various estradiol-17beta treatments on follicle-stimulating hormone peaks, luteinizing hormone pulses, basal gonadotropin concentrations, and antral follicle and luteal development in cyclic ewes. Biol. Reprod. 77:252-262.
Liu, X., Hart, E.J., Dai, Q., Rawlings, N.C., Pierson, R.A., Bartlewski, P.M. (2007). Ultrasonographic image attributes of non-ovulatory follicles and follicles with different luteal outcomes in gonadotropin-releasing hormone (GnRH)-treated anestrous ewes. Theriogenology 67:957-969.
Liu, X., Dai, Q., Hart, E.J., Duggavathi, R., Barrett, D.M.W., Rawlings, N.C., Bartlewski, P.M. (2006). Ovarian and endocrine responses to prostaglandin F2alpha (PGF2alpha) given at the expected time of the endogenous FSH peak at mid-cycle in ewes. Theriogenology 66:811-821.
Barrett, D.M.W., Bartlewski, P.M., Duggavathi, R., Davies, K.L., Rawlings, N.C. (2006). Suppression of follicle wave emergence in cyclic ewes by supraphysiologic concentrations of estradiol-17beta and induction with a physiologic dose of exogenous ovine follicle-stimulating hormone. Biol. Reprod. 75: 663-641.
Davies, K.L., Bartlewski, P.M., Epp, T., Duggavathi, R., Barrett, D.M.W., Bagu, E.T., Cook, S.J., Rawlings, N.C. (2006). Does injection of prostaglandin F2alpha (PGF2alpha) cause ovulation in anestrous Western White Face ewes? Theriogenology 66: 251-259.
Duggavathi, R., Bartlewski, P.M., Agg, E., Flint, S., Barrett, D.M.W., Rawlings, N.C. (2005). The effect of the manipulation of FSH-peak characteristics on follicular wave dynamics in sheep: Does an ovarian-independent endogenous rhythm in FSH secretion exist? Biol. Reprod. 72: 1466-1474.
Honaramooz, A., Aravindakshan, J., Chandolia, R.K., Beard, A.P., Bartlewski, P.M., Pierson, R.A., Rawlings, N.C. (2004). Ultrasonographic evaluation of the prepubertal development of the reproductive tract in beef heifers. Anim. Reprod. Sci. 80: 15-29.
Barrett, D.M.W., Bartlewski, P.M., Batista-Arteaga, M., Symington, A., Rawlings, N.C. (2004). Ultrasound and endocrine evaluation of the ovarian response to a single injection of 500 IU of eCG following a 12-day treatment with progestogen-releasing intravaginal sponges in and out of the breeding season in ewes. Theriogenology 61: 311-327.
Bartlewski, P.M., Aravindakshan, J., Beard, A.P., Nelson, M.L., Batista-Arteaga, M., Cook, S.J., Rawlings, N.C. (2004). Effects of medroxyprogesterone acetate (MAP) on ovarian antral follicle development, gonadotrophin secretion and response to ovulation induction with gonadotrophin-releasing hormone (GnRH) in seasonally anoestrous ewes. Anim. Reprod. Sci. 81: 63-75.
Duggavathi, R., Bartlewski, P.M., Barrett, D.M.W., Rawlings, N.C. (2003). Use of high-resolution transrectal ultrasonography to assess changes in numbers of small ovarian antral follicles and their relationships to the emergence of follicular waves in cyclic ewes. Theriogenology 60: 495-610.
Rawlings, N.C., Evans, A.C.O., Honaramooz, A., Bartlewski, P.M. (2003). Antral follicle growth and endocrine changes in prepubertal cattle, sheep and goats. Anim. Reprod. Sci. 78: 259-270.
Duggavathi, R., Bartlewski, P.M., Pierson, R.A., Rawlings, N.C. (2003). Luteogenesis in cyclic ewes: Echotextural, histological and functional correlates. Biol. Reprod. 69: 634-639.
Swan, C.L., Agostini, M.C., Bartlewski, P.M., Feyles, V., Urban, R.J., Chedrese, P.J. (2002). Effects of progestins on progesterone synthesis in a stable porcine granulosa cell line: Control of transcriptional activity of the cytochrome P450 side-chain cleavage gene. Biol. Reprod. 66: 959-965.
Bartlewski, P.M., Beard, A.P., Chapman, C.L., Nelson, M.L., Palmer, B., Aravindakshan, J., Cook, S.J., Rawlings, N.C. (2001). Ovarian responses in GnRH-treated anoestrous ewes: Follicular and endocrine correlates with luteal outcome. Reprod. Fertil. Develop. 13: 133-142.
