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• W2048336976 abstract "Brucellosis and tuberculosis are endemic in Wood Buffalo National Park, the largest reserve of wood bison (Bison bison athabascae) in Canada. Our goal is to produce and preserve disease-free embryos for the purpose of wood bison repopulation. This study was designed to determine if embryo collection is feasible in wood bison during the anovulatory season (May–July) and to test if progesterone priming is required for superovulation. A 2-by-2 design was used to determine the effectiveness of LH (Lutropin) or hCG (Chorulon) for induction of ovulation with or without intravaginal progesterone releasing device (PRID) in 32 wood bison cows. Follicular wave emergence was synchronized among bison by transvaginal ultrasound-guided follicle ablation. Synchronized bison were assigned to 4 groups: PRID+LH (n = 12), PRID+hCG (n = 4), no-PRID+LH (n = 12) and no-PRID+hCG (n = 4). A PRID was inserted on the day of follicular ablation in the respective groups. A single SC dose of 400 mg FSH (Folltropin) in a slow-release formulation was given the day after follicular ablation (i.e. on the expected day of a new follicular wave emergence, Day 0). The PRID was removed on Day 4 and either 25 mg LH or 2000 IU hCG was given IM on Day 5. Artificial insemination was done at 24, 36 and 48 h after LH or hCG treatment. Embryos were collected nonsurgically on Day 13 using commercial bovine equipment. Transrectal ultrasonography was done on Days 0, 5, 6, 7, 8 and 13 to record follicular and ovulatory responses. Count data (mean ± SEM) were analysed by two-way ANOVA and proportions by chi square. The number of ovulatory-sized follicles (≥10 mm) on Day 5 did not differ among groups (P = 0.33; Table 1). Ovulation rate (number of ovulations/number of follicles ≥10 mm) was greater in bison treated with hCG (P < 0.05; Table 1). The number of corpora lutea (CL) on Day 13 was greater in bison treated with hCG without a PRID (P < 0.05; Table 1). No differences in number of ova/embryos and transferable embryos were found among groups (P = 0.36 and P = 0.52, respectively; Table 1). In conclusion, progesterone priming (PRID) had no effect on ovarian superstimulation in wood bison in the anovulatory season. The ovulatory response was satisfactory only in bison treated with hCG. Embryo collection is feasible in wood bison, but the reasons for a low embryo collection rate in all groups remain unclear. Table 1.Response to superovulation and embryo collection in wood bison Funded by Advancing Canadian Agriculture and Agri-Food and Agri-Food Innovation." @default.
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• W2048336976 date "2012-01-01" @default.
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• W2048336976 title "227 SUPEROVULATION AND EMBRYO COLLECTION IN WOOD BISON DURING THE ANOVULATORY SEASON" @default.
• W2048336976 doi "https://doi.org/10.1071/rdv24n1ab227" @default.
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