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A total of 23 adult Can\u00e1ria de Pelo ewes (clinically healthy, multiparous, non-pregnant; mean age 2.5 years; average body weight 39.50\u2009\u00b1\u20091.25\u00a0kg) and 30 North Tinerfe\u00f1a goats (all females, aged 2\u20134 years and non-pregnant; average body weight 39.45\u2009\u00b1\u20093.58\u00a0kg) were evaluated. Physiological variables (rectal temperature and respiratory rate), coat morphological traits (coat thickness, hair length, and hair diameter), and environmental variables (air temperature and relative humidity) were measured. Repeated-measures analysis revealed significant population effects for rectal temperature and respiratory rate (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009&lt;\u20090.001). Can\u00e1ria sheep exhibited higher rectal temperatures and markedly higher respiratory rates than North Tinerfe\u00f1a goats, although rectal temperature remained within the physiological range of homeothermy in both populations. North Tinerfe\u00f1a goats exhibited significantly thicker and longer coats with larger hair diameters than Can\u00e1ria sheep (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009&lt;\u20090.001), demonstrating marked population-associated differences in coat morphology. Canonical discriminant analysis performed at the individual-animal level and validated using leave-one-animal-out cross-validation correctly classified 98.1% of animals using physiological traits alone and 100% using either coat morphological traits or the combined set of physiological and morphological variables. The classification tree identified hair length as the primary discriminatory trait between populations, with a threshold of 54.70\u00a0mm completely separating the two groups within the evaluated population. These findings demonstrate pronounced population-associated physiological and morphological differentiation related to thermoregulation in dark-coated North Tinerfe\u00f1a goats and Can\u00e1ria sheep and provide a basis for further investigation of thermoregulatory variation in locally adapted small ruminants.\n                  <\/jats:p>","DOI":"10.1007\/s00484-026-03324-z","type":"journal-article","created":{"date-parts":[[2026,9,14]],"date-time":"2026-09-14T08:11:46Z","timestamp":1789373506000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Morphophysiological profiles associated with thermoregulation in dark-coated North Tinerfe\u00f1a goats and Can\u00e1ria de Pelo sheep in the Canary Islands"],"prefix":"10.1007","volume":"70","author":[{"given":"Wallace Sostene Tavares","family":"da Silva","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2285-9695","authenticated-orcid":false,"given":"Robson Mateus Freitas","family":"Silveira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luis Alberto","family":"Bermejo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexandr Torres","family":"Krupij","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D\u00e9bora Andr\u00e9a Evangelista","family":"Fa\u00e7anha","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,14]]},"reference":[{"key":"3324_CR1","doi-asserted-by":"publisher","first-page":"106550","DOI":"10.1016\/j.smallrumres.2021.106550","volume":"205","author":"AM Aboul-Naga","year":"2021","unstructured":"Aboul-Naga AM, Elshafie MH, Kholif HH, Osman MM, Khalek A, El-Beltagi TM, Abdel-Aal AR, Abdel-Sabour ES, Rekik T, Rouatbi M, M., Rischkowsky B (2021) Tolerance capability of desert sheep and goats to exercise heat stress under hot dry conditions, and its correlation with their production performance. 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After using this tool, the authors carefully reviewed and edited the content as needed and take full responsibility for the publication\u2019s content.","order":4,"name":"Ethics","label":"Declaration of generative AI and AI-assisted technologies","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"None.","order":5,"name":"Ethics","label":"Conflict of interest","group":{"name":"EthicsHeading","label":"Declarations"}}],"article-number":"252"}}