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Several studies have described how phenotypic characteristics of the mother, climatic conditions, population status, and habitat can impact on potential reproductive output in wild ungulates. However, little is known regarding the internal, physiological factors, that may account for differences in implantation rates. The present study investigated the differences in implantation rates and site on the basis of site and number of ovulations through the examination of about 3000 intact uteri collected from pregnant roe deer does (<jats:italic>Capreolus capreolus<\/jats:italic>). Although ovulation occurs with the same frequency in the left and right ovary, we revealed a higher frequency of embryos implantation in the left uterine horn in odd litter size, demonstrating that embryos can migrate between the uterine horns. In our study, a greater proportion of reproductive wastage was associated to females with three and four corpora lutea and interestingly, in relation to the site of ovulation, the percentage of corpora lutea that did not correspond to a fetus was higher in the right ovary than in the left one (73.2% vs. 26.8%). Our research described for the first time the absence of laterality in ovulation and the presence of laterality in implantation in roe deer, thus laying the foundations for in\u2010depth studies about the functionality of this uterine side and for comparisons with populations located in other geographical areas to understand whether it is a widespread phenomenon or a local adaptation.<\/jats:p>","DOI":"10.1002\/jez.2748","type":"journal-article","created":{"date-parts":[[2023,8,22]],"date-time":"2023-08-22T02:08:57Z","timestamp":1692670137000},"page":"994-1002","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Laterality in roe deer embryos implantation"],"prefix":"10.1002","volume":"339","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6734-5319","authenticated-orcid":false,"given":"Roberta","family":"Chirichella","sequence":"first","affiliation":[{"name":"Department of Humanities and Social Sciences University of Sassari Sassari Italy"},{"name":"Department of Veterinary Medicine University of Sassari  Sassari Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marco","family":"Apollonio","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine University of Sassari  Sassari Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Siriano","family":"Luccarini","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine University of Sassari  Sassari Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fiammetta","family":"Berlinguer","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine University of Sassari  Sassari Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,8,21]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1530\/jrf.0.0390225"},{"key":"e_1_2_10_3_1","first-page":"258","volume-title":"The European roe deer: The biology of success","author":"Andersen R.","year":"1998"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s13364-017-0321-5"},{"key":"e_1_2_10_5_1","unstructured":"Apollonio M. &Mattioli L.(2006).Il lupo in provincia di Arezzo. 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