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For this study, two conceptuses were used per gestational age of 25\u2013120\u2009days post\u2010copulation (dpc) and neonates with 145\u2009dpc, totalling 22 animals. Females were euthanised, and embryos\/foetuses were examined, measured, and photographed. During the first third of the gestational period (25\u201350\u2009dpc,<jats:italic>n<\/jats:italic>\u2009=\u20098), a marked body curvature, brain vesicles, somites, internal organs, placid lens, auricular protrusion and limb buds are noted. In the second third of the gestational period (51\u2013100\u2009dpc,<jats:italic>n<\/jats:italic>\u2009=\u200910), foetuses lose their body curvature, displaying greater anatomical definition, including skeletal, external ears, nostrils, eyelids and tactile hair formation and cranial suture closure. In addition, dorsal scent gland and genital tubercle differentiation were visualized at 50\u2009days post\u2010copulation. In the third of the gestational period (101\u2013145\u2009dpc,<jats:italic>n<\/jats:italic>\u2009=\u20094), the organs become completely formed, alongside skin darkening, eyelid opening, dental eruption, dorsal odorous gland development, sexual organ externalization, and fanero attachment development. These data allowed for the construction of a prenatal growth curve, providing comparative anatomy information for ungulates and further contributing towards rational reproductive management and reproductive biotechnologies for this species.<\/jats:p>","DOI":"10.1111\/ahe.13035","type":"journal-article","created":{"date-parts":[[2024,3,26]],"date-time":"2024-03-26T09:21:19Z","timestamp":1711444879000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Prenatal post\u2010implantation development of collared peccaries (<i>Pecari tajacu<\/i>Linnaeus, 1758)"],"prefix":"10.1111","volume":"53","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3679-2797","authenticated-orcid":false,"given":"H\u00e9lio Noberto","family":"de Ara\u00fajo\u00a0J\u00fanior","sequence":"first","affiliation":[{"name":"Universidade Federal Rural Do Semi\u2010\u00c1rido (UFERSA) Mossor\u00f3 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1832-4647","authenticated-orcid":false,"given":"Igor Renno Guimar\u00e3es","family":"Lopes","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural Do Semi\u2010\u00c1rido (UFERSA) Mossor\u00f3 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5883-9704","authenticated-orcid":false,"given":"Ana Caroline Freitas Caetano","family":"de Sousa","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural Do Semi\u2010\u00c1rido (UFERSA) Mossor\u00f3 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2429-1266","authenticated-orcid":false,"given":"Gleidson Benevides","family":"de Oliveira","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural Do Semi\u2010\u00c1rido (UFERSA) Mossor\u00f3 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0370-4447","authenticated-orcid":false,"given":"Radan Elvis Matias","family":"de Oliveira","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural Do Semi\u2010\u00c1rido (UFERSA) Mossor\u00f3 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3878-4264","authenticated-orcid":false,"given":"Mois\u00e9s Dantas","family":"Tertulino","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural Do Semi\u2010\u00c1rido (UFERSA) Mossor\u00f3 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1265-0698","authenticated-orcid":false,"given":"Emanuel Lucas Bezerra","family":"Rocha","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural Do Semi\u2010\u00c1rido (UFERSA) Mossor\u00f3 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8651-7312","authenticated-orcid":false,"given":"Paulo Ricardo","family":"Firmino","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural Do Semi\u2010\u00c1rido (UFERSA) Mossor\u00f3 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2137-854X","authenticated-orcid":false,"given":"Alexsandra Fernandes","family":"Pereira","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural Do Semi\u2010\u00c1rido (UFERSA) Mossor\u00f3 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6269-0823","authenticated-orcid":false,"given":"Moacir Franco","family":"de Oliveira","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural Do Semi\u2010\u00c1rido (UFERSA) Mossor\u00f3 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,3,26]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.theriogenology.2018.07.006"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.theriogenology.2017.12.022"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.2307\/2421857"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1177\/00220345760550040701"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.theriogenology.2017.08.004"},{"key":"e_1_2_10_7_1","volume-title":"Fundamentos de embriologia bucodent\u00e1ria","author":"Brito J. 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