The effect of equine chorionic gonadotropin (eCG) on pregnancy rates of white-tailed deer following fixed-timed artificial insemination

摘要: Control of the white-tailed doe's reproductive cycle is not well documented. The objective was to determine effects giving equine chorionic gonadotropin (eCG) at progesterone device removal on fixed time artificial insemination (FTAI) pregnancy rates in does. All does (n = 74) were synchronized with a vaginal implant (CIDR; 0.3 g progesterone), inserted Day 0 (without regard stage estrous cycle), removed 14 days later, and subjected FTAI, average, 60 h post-CIDR removal. Of these, 34 given 200 IU (im) eCG CIDR Overall, FTAI rate 50% across 2 yrs (effect year, P 0.35). Administration did affect (P 0.16) (eCG 59%; no 43%). Pregnancy affected by vulva score or doe disposition. Does that ≤ 4 old more likely 0.01) become pregnant than > age. inseminated ≥ 60.5 after 22 times 0.002) < h. When frozen-thawed semen deposited cervix uterus, 17 0.005) compared those receiving intravaginal insemination. Fecundity different 0.73) treatment groups (1.6 ± 0.11; vs. 1.7 0.10; eCG). Furthermore, fecundity 0.72) clean-up bucks (1.7 0.08; AI 0.09; bucks). In summary, successfully using protocol, may be essential for acceptable rates, increased result when done