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Epididymal sperm (n\u00a0=\u00a061 per season), collected during the breeding season (July\u2013September), had significantly higher post\u2010thaw total motility (36.76\u00a0\u00b1\u00a014.18 vs 31.24\u00a0\u00b1\u00a012.74%), and lower linearity (0.36\u00a0\u00b1\u00a00.06 vs 0.39\u00a0\u00b1\u00a00.04) and wobbliness (0.49\u00a0\u00b1\u00a00.04 vs 0.51\u00a0\u00b1\u00a00.03; mean\u00a0\u00b1\u00a0<jats:styled-content style=\"fixed-case\">SD<\/jats:styled-content>) compared to non\u2010breeding season (January\u2013March) samples. Representative samples (n\u00a0=\u00a04) from each season were used in heterologous <jats:styled-content style=\"fixed-case\">IVF<\/jats:styled-content> trials using cattle oocytes. Cleavage, morulae and blastocyst percentage were higher for breeding vs non\u2010breeding season sperm samples (81.88\u00a0\u00b1\u00a06.8 vs 49.94\u00a0\u00b1\u00a06.77; 41.89\u00a0\u00b1\u00a013.40 vs 27.08\u00a0\u00b1\u00a023.21; and 30.49\u00a0\u00b1\u00a017.87 vs 13.72\u00a0\u00b1\u00a018.98%, respectively). Plains bison ovaries collected during the breeding (n\u00a0=\u00a097 pairs) and non\u2010breeding (n\u00a0=\u00a0100 pairs) seasons were classified as luteal or follicular. Oocytes recovered from these ovaries were classified into five grades based on morphology. There was no significant difference in the number of luteal ovaries or grades of oocytes recovered. Oocytes were matured, fertilized (with frozen sperm from three bison bulls) and cultured <jats:italic>in vitro<\/jats:italic>. Cleavage percentage was higher for oocytes collected during breeding vs non\u2010breeding season (83.72\u00a0\u00b1\u00a06.42 vs 73.98\u00a0\u00b1\u00a06.43), with no significant difference in subsequent development to blastocysts. In summary, epididymal sperm from non\u2010breeding season had decreased total motility and resulted in reduced embryo production <jats:italic>in vitro<\/jats:italic>. Oocytes collected during non\u2010breeding season had reduced ability to be matured, fertilized and\/or undergo cleavage <jats:italic>in vitro<\/jats:italic>. Data suggested that season influenced gamete quality in plains bison.<\/jats:p>","DOI":"10.1111\/rda.12471","type":"journal-article","created":{"date-parts":[[2014,12,22]],"date-time":"2014-12-22T05:24:14Z","timestamp":1419225854000},"page":"206-213","source":"Crossref","is-referenced-by-count":14,"title":["Effect of Reproductive Seasonality on Gamete Quality in the North American Bison (<i>Bison bison bison<\/i>)"],"prefix":"10.1111","volume":"50","author":[{"given":"S","family":"Krishnakumar","sequence":"first","affiliation":[{"name":"Department of Production Animal Health Faculty of Veterinary Medicine University of Calgary Calgary AB Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"DP","family":"Whiteside","sequence":"additional","affiliation":[{"name":"Department of Ecosystem and Public Health Faculty of Veterinary Medicine University of Calgary Calgary AB Canada"},{"name":"Animal Health Centre Calgary Zoo Calgary AB Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"B","family":"Elkin","sequence":"additional","affiliation":[{"name":"Department of Ecosystem and Public Health Faculty of Veterinary Medicine University of Calgary Calgary AB Canada"},{"name":"Wildlife Division Department of Environment and Natural Resources Government of Northwest Territories Yellowknife NT Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"JC","family":"Thundathil","sequence":"additional","affiliation":[{"name":"Department of Production Animal Health Faculty of Veterinary Medicine University of Calgary Calgary AB 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