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Identifying steroid and pituitary hormone profiles in the female black bear (Ursus americanus) throughout pregnancy may provide a greater understanding of the reproductive cycle and indicate which hormones are required for implantation. Our objective was to assess endocrine activity in black bears oestrus onset, at oestrus, during pregnancy and after(More)
OBJECTIVE To prospectively compare pregnancy rates for couples undergoing IUI by a single healthcare provider with random assignment to either rigid (Tomcat; Kendall Sovereign, Mansfield, MA) or flexible (Soft Pass; Cook, Spencer, IN) catheters. DESIGN Randomized, controlled study. SETTING Tertiary care infertility practice. PATIENT(S) One hundred(More)
Insulin-like growth factor I (IGF-I) has been identified in human seminal plasma. This study was conducted to determine whether IGF-I is present in bovine seminal plasma, whether sperm cells express the IGF-I receptor (IGF-IR), and whether IGF-I affects sperm motility. Semen samples were collected from bulls by electroejaculation and maintained at 37(More)
OBJECTIVE The purpose of this study was to develop a closed vitrification system, compare vitrification to a slow-cooled cryopreservation method, and compare the pup rate between both methods using two-cell mouse embryos. DESIGN Randomized, prospective animal study. SETTING Hospital-based IVF practice. ANIMAL(S) B6C3F1 mouse embryos. INTERVENTION(S)(More)
OBJECTIVE To determine the usefulness of and cost-effectiveness of antisperm antibody testing in the prediction of poor fertilization rates in couples undergoing IVF. DESIGN Retrospective cohort study. SETTING A hospital-based reproductive endocrinology and infertility practice. PATIENT(S) Male partners of 251 couples undergoing IVF between 1992 and(More)
OBJECTIVE To determine accuracy and precision of old and new design MicroCell counting Chambers analyzed manually and with a computer-automated semen analyzer (CASA; Hamilton-Thorn Research, Beverly, MA). DESIGN Prospective study using comparative measurements of the concentration of latex beads with old and new design MicroCell Counting Chambers(More)
OBJECTIVE To investigate the effect of improved air quality on IVF and subsequent embryo development. DESIGN Retrospective cohort study. SETTING Hospital-based IVF facility composed of an anteroom, a cleanroom, and an adjacent operating room. PATIENT(S) Two-hundred seventy-five couples requesting IVF between 1993 and 1997. INTERVENTION(S) None. (More)