Pawel Bartlewski

Associate Professor

Ontario Veterinary College, Department of Biomedical Sciences

DVM, MSc, PhD (Saskatoon)

Lab: OVC 1677/1671B
519-824-4120 Ext. 52136

Research Interests

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)
Cryopreservation of gametes and embryos using nanotechnology products
Nutritional influences on reproductive processes in small ruminants and pigs
Development of farm animal models for amelioration of hormonal treatments in women

Current Graduate Students

Shiksha Ghimire, MBS
Esha Hans, MBS
Raphaelle Kouadio, MBS
Shehrzad Mallick, MBS
Parnia Mohammadi, MBS
Arinola Sanyaolu, MBS
Rathursana Thangarajah, MBS
Nicole Zorzan Oliveira, MBS

Selected Publications

Oliveira, M.E.F., Ayres, H., Oliveira, L.G., Barros, F.F.P.C., Oba. E., Bicudo, S.D., Bartlewski, P.M.,Fonseca, J.F., Vicente, W.R.R. (2016). Effects of season and ovarian status on the outcome of long-term progesterone-based estrus synchronization protocols and ovulatory follicle development in Santa Inês ewes under subtropical conditions. Theriogenology 85:452-460.
Santos, V.J.C., Simplıcio, K.M.M.G., Sanchez, D.C.C., Coutinho, L.N., Teixeira, P.P.M., Barros, F.F.P.C., Almeida, V.T., Rodrigues, L., Bartlewski, P.M,, Oliveira, M.E.F., Feliciano, M.A.R., Vicente, W.R.R. (2015). B-mode and Doppler sonography of the mammary glands in dairy goats for mastitis diagnosis. Reproduction in Domestic Animals 50:251-255.
Warren, L., Murawski, M., Wilk, K., Zięba, D.A., Bartlewski, P.M. (2015). Suitability of antral follicle counts and computer-assisted analysis of ultrasonographic and magnetic resonance images for estimating follicular reserve in porcine, ovine and bovine ovaries ex situ. Experimental Biology and Medicine 240:576-584.
Murawski, M., Schwarz, T., Grygier, J., Patkowski, K., Oszczęda, Z., Jelkin, I., Kosiek, A., Gruszecki, T.M., Szymanowska, A., Skrzypek, T., Zięba, D.A., Bartlewski, P.M. (2015). The utility of nanowater for ram semen cryopreservation. Experimental Biology and Medicine 240:611-617.
Candappa, I.B.R., Bartlewski, P.M. (2014). Induction of cervical dilation for transcervical embryo transfer in ewes. Reproductive Biology and Endocrinology 12:8.
Kirsz, K., Szczęsna, M., Dudek, K., Bartlewski, P.M., Zięba, D.A. (2014). Influence of season and nutritional status on the direct effects of leptin, orexin-A, and ghrelin on luteinizing hormone and growth hormone secretion in the ovine pituitary explant model. Domestic Animal Endocrinology 48:69-76.
Giffin, J.L., Bartlewski, P.M., Hahnel, A. (2014). Correlations among ultrasonographic and microscopic characteristics of prepubescent ram lamb testes. Experimental Biology and Medicine 239:1606-1618.
Oluwole, O.A., Bartlewski, P.M., Hahnel A. (2013). Relationships of serum thyroid hormones and follicle-stimulating hormone concentrations to Sertoli cell differentiation during the first wave of spermatogenesis in euthyroid ram lambs. Reproductive Biology 13:150-160.
Schwarz, T., Murawski, M., Wierzchoś, E., Bartlewski, P.M. (2013). An ultrasonographic study of ovarian antral follicular dynamics in prepubertal gilts during the expected activation of the hypothalamo-pituitary-ovarian axis. Journal of Reproduction and Development 59:409-414.
Ahmadi, B., Mirshahi, A., Giffin, J., Oliveira, M.E.F., Gao, L., Hahnel, A., Bartlewski, P.M. (2013). Preliminary assessment of the quantitative relationships between testicular tissue composition and ultrasonographic image attributes in the ram. The Veterinary Journal 198:282-285.
Ahmadi, B., Lau, C., Giffin, J.L., Santos, N., Hahnel, A., Raeside, J., Christie, H., Bartlewski, P.M. (2012). Suitability of epididymal and testicular ultrasonography and computerized image analysis for assessment of current and future semen quality in the ram. Experimental Biology and Medicine 237:186-193.
Macaulay, A., Hamilton, C., Bartlewski, P.M., King, W.A. (2012). The effects of substituting glassware for plasticware and the use of an ethanol vector on oocyte maturation in vitro. Veterinary Medicine International Volume 2012 (2012), Article ID 914715, 9 pages; doi:10.1155/2012/914715
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.