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• W2620784312 abstract "A high fecundity bovine genotype has recently been discovered and genetic mapping indicates evidence for segregation of a major gene with influence on ovulation rate located on bovine chromosome 10. Cattle carrying the high fecundity allele, referred to as the Trio allele, have multiple ovulations while half-sibling, non-carriers generally have single ovulations. The present study was designed to evaluate follicle wave patterns and associated circulating hormones during the estrous cycle of Trio allele carriers (n = 7) and non-carrier half-sib controls (n = 5). We hypothesized that Trio allele carriers would exhibit multiple smaller dominant follicles and greater circulating FSH than non-carrier controls. The proportion of Trio carrier and non-carrier cows with 2 or 3-wave patterns was not different between genotypes with the majority (>70%) exhibiting 3-wave patterns. Trio carriers had greater (P < 0.01) number of ovulations (∼4 vs ∼1 ovulations) and smaller preovulatory follicles (8.9 vs. 14.9 mm; P < 0.01) than non-carrier controls. However, total luteal tissue volume and circulating progesterone, normalized to the initial ovulation or to the onset of luteolysis, were not different between genotypes (P > 0.10). Follicular waves were found to be associated with an FSH surge in both genotypes. Peak FSH concentration at each follicular wave (3-wave patterns) was not different (P > 0.05) between genotypes, but circulating FSH during the decline and nadir, encompassing the day of deviation, was greater (P < 0.05) in Trio carriers. Despite a difference (P = 0.032) in the length of the estrous cycle (23.0 vs. 25.2 d; Trio carrier and non-carriers respectively), the pattern of follicle growth, such as day of wave emergence, day of follicle deviation, and day of maximum diameter of the dominant follicle, when normalized to the FSH surge of each follicular wave were similar in Trio carriers compared to non-carriers although Trio carriers consistently had much smaller-sized follicles (P < 0.05). Thus, decreased follicle size and greater circulating FSH are key components of the mechanism that produces multiple ovulations in cattle that are carriers of the Trio high fecundity allele." @default.
• W2620784312 created "2017-06-09" @default.
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• W2620784312 date "2017-09-01" @default.
• W2620784312 modified "2023-09-27" @default.
• W2620784312 title "Follicular waves and hormonal profiles during the estrous cycle of carriers and non-carriers of the Trio allele, a major bovine gene for high ovulation and fecundity" @default.
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• W2620784312 doi "https://doi.org/10.1016/j.theriogenology.2017.05.029" @default.
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