Publications

DMW Barrett, PM Bartlewski, R Duggavathi, KL Davies, SL Huchkowsky, T Epp, & NC Rawlings (2008). Synchronization of follicular wave emergence in the seasonally anestrous ewe: The effects of estradiol with or without medroxyprogesterone acetate. Theriogenology 69(7): 827-36.

PM Bartlewski, BD Alexander, NC Rawlings, DMW Barrett, & WA King (2008). Ovarian responses, hormonal profiles and embryo yields in anoestrous ewes superovulated with Folltropin®-V after pretreatment with medroxyprogesterone acetate-releasing vaginal sponges and a single dose of oestradiol-17β. Reprod. Domest. Anim. 43(3): 299-307.

R Duggavathi, PM Bartlewski, DMW Barrett, ET Bagu, & NC Rawlings (2008). Short- and long-term effects of unilateral ovariectomy in sheep: Causative mechanisms. Biol. Reprod. 78: 490-96.

S Madgwick, ET Bagu, R Duggavathi, PM Bartlewski, DMW Barrett, S Huchkowsky, SJ Cook, AP Beard, & NC Rawlings (2008). Effects of treatment with GnRH from 4 to 8 weeks of age on the attainment of sexual maturity in bull calves. Anim. Reprod. Sci. 104 (2-4): 177-88.

DMW Barrett, R Duggavathi, KL Davies, PM Bartlewski, ET Bagu, & NC Rawlings (2007). Differential effects of various estradiol-17β treatments on follicle-stimulating hormone peaks, luteinizing hormone pulses, basal gonadotropin concentrations, and antral follicle and luteal development in cyclic ewes. Biol. Reprod. 77(2): 252-62.

X Liu, Q Dai, EJ Hart, DMW Barrett, NC Rawlings, RA Pierson, & PM Bartlewski (2007). Ultrasonographic characteristics of ovulatory follicles and associated endocrine changes in cyclic ewes treated with medroxyprogesterone acetate (MAP)-releasing intravaginal sponges and equine chorionic gonadotropin (eCG). Reprod. Dom. Anim. 42(4): 393-401.

DMW Barrett, PM Bartlewski, R Duggavathi, KL Davies, & NC Rawlings (2006). Suppression of follicle wave emergence in cyclic ewes by supra-physiological concentrations of estradiol-17β and induction with a physiological dose of exogenous ovine follicle-stimulating hormone. Biol. Reprod. 75(4): 633-41.

KL Davies, PM Bartlewski, T Epp, DMW Barrett, R Duggavathi, ET Bagu, SJ Cook, & NC Rawlings (2006). Does injection of prostaglandin F2α (PGF2α) cause ovulation in anestrous Western White Face ewes? Theriogenology 66(2): 251-59.

R Duggavathi, K Janardhan, J Singh, B Singh, DMW Barrett, KL Davies, ET Bagu, & NC Rawlings (2006). Patterns of expression of steroidogenic enzymes during the first wave of the ovine estrous cycle as compared to the preovulatory follicle. Anim. Reprod. Sci. 91(3-4): 345-52.

X Liu, Q Dai, EJ Hart, R Duggavathi, DMW Barrett, NC Rawlings, & PM Bartlewski (2006). Ovarian and endocrine responses to prostaglandin F2α (PGF2α) given at the expected time of the endogenous FSH peak at mid-cycle in ewes. Theriogenology 66(4): 811-21.

R Duggavathi, PM Bartlewski, E Agg, S Flint, DMW Barrett, & NC Rawlings (2005). The effect of the manipulation of follicle‑stimulating hormone (FSH)‑peak characteristics on follicular wave dynamics in sheep: Does an ovarian‑independent endogenous rhythm in FSH secretion exist? Biol. Reprod. 72(6): 1466-74.

R Duggavathi, PM Bartlewski, DMW Barrett, & NC Rawlings (2005). The temporal relationship between patterns of LH and FSH secretion, and development of ovulatory-sized follicles during the mid- to late-luteal phase of sheep. Theriogenology 64(2): 393-407.

ET Bagu, S Madgwick, R Duggavathi, PM Bartlewski, DMW Barrett, S Huchkowsky, SJ Cook, & NC Rawlings (2004). Effects of treatment with LH or FSH from 4 to 8 weeks of age on the attainment of puberty in bull calves. Theriogenology 62(5):861‑73.

DMW Barrett, PM Bartlewski, M Batista-Arteaga, A Symington, & NC Rawlings (2004). Ultrasound and endocrine evaluation of the ovarian response to a single dose of 500 IU of eCG following a 12‑day treatment with progestogen‑releasing intravaginal sponges in the breeding and nonbreeding seasons in ewes. Theriogenology 61(2‑3): 311‑327.

R Duggavathi, PM Bartlewski, DMW Barrett, C Gratton, ET Bagu, & NC Rawlings (2004). Patterns of antral follicular wave dynamics and accompanying endocrine changes in cyclic and seasonally anestrous ewes treated with exogenous ovine follicle‑stimulating hormone during the inter‑wave interval. Biol. Reprod. 70(3): 821‑827.

PM Bartlewski, R Duggavathi, J Aravindakshan, DMW Barrett, SJ Cook, & NC Rawlings (2003). Effects of a 6-day treatment with medroxyprogesterone acetate after prostaglandin F2α -induced luteolysis at midcycle on antral follicular development and ovulation rate in nonprolific Western White-Faced ewes. Biol. Reprod. 68 (4): 1403-1412.

R Duggavathi, PM Bartlewski, DMW Barrett, & NC Rawlings (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 (3): 495‑510.

DMW Barrett, PM Bartlewski, SJ Cook, & NC Rawlings (2002). Ultrasound and endocrine evaluation of the ovarian response to PGF2α given at different stages of the luteal phase in ewes. Theriogenology 58 (7): 1409-1424.