{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T09:04:35Z","timestamp":1790240675623,"version":"4.1.0"},"reference-count":25,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,8,9]],"date-time":"2026-08-09T00:00:00Z","timestamp":1786233600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"\u201cSUB1.1. Clusters of Research Excellence (CREs)\u201d","award":["TA 5180519"],"award-info":[{"award-number":["TA 5180519"]}]},{"name":"Research Committee of the University of Thessaly","award":["8289"],"award-info":[{"award-number":["8289"]}],"id":[{"id":"https:\/\/ror.org\/04v4g9h31","id-type":"ROR","asserted-by":"crossref"}]},{"award":["8289"],"award-info":[{"award-number":["8289"]}],"id":[{"id":"https:\/\/ror.org\/04v4g9h31","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Life"],"abstract":"<jats:p>Heat stress (HS) suppresses voluntary feed intake in lactating sows, yet individual-level characterization of indoor and outdoor Temperature\u2013Humidity Index (THI) linked to feed intake is rare in Mediterranean commercial settings. This prospective observational study enrolled 272 F1-crossbred sows (parities 1\u20137) farrowing from May\u2013October 2025 at a commercial Greek farm. Outdoor THI was computed from 8760 hourly records and indoor THI from calibrated dataloggers; individual daily lactation feed intake (days 1\u201330) was recorded via RFID transponder-feeders. Building cooling (\u0394THI = 3.7\u201314.3) attenuated but did not eliminate mild-to-moderate indoor stress from June\u2013September. Only parity and stillbirth count were Bonferroni-significant correlates of feed intake (parity: \u03b2 = +0.142, p = 0.002). A sow-day Gradient Boosting model, evaluated by grouped cross-validation to prevent within-sow leakage, achieved CV-R2 = 0.406 \u00b1 0.045, providing a validated, herd-tested framework for parity-stratified feeding management, pending external validation across farms, genetics, and climates.<\/jats:p>","DOI":"10.3390\/life16081306","type":"journal-article","created":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T01:20:03Z","timestamp":1786324803000},"page":"1306","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Heat Stress, Indoor Microclimate, and Lactation Feed Intake in Commercial Mediterranean Sows: Parity Effects and a Daily Resolution Predictive Model"],"prefix":"10.3390","volume":"16","author":[{"given":"Lampros","family":"Fotos","sequence":"first","affiliation":[{"name":"Clinic of Medicine, Faculty of Veterinary Medicine, University of Thessaly, 43100 Karditsa, 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Sci."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1080\/00431672.1959.9926960","article-title":"The discomfort index","volume":"12","author":"Thom","year":"1959","journal-title":"Weatherwise"},{"key":"ref_7","unstructured":"Clark, J.A., and McArthur, A.J. (1984). Report of Working Group on Climatization of Animal Houses, Commission Internationale du G\u00e9nie Rural."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"2220","DOI":"10.2527\/jas.2010-3329","article-title":"A meta-analysis of the effects of high ambient temperature on growth performance of growing-finishing pigs","volume":"89","author":"Renaudeau","year":"2011","journal-title":"J. Anim. Sci."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"189","DOI":"10.20506\/rst.33.1.2273","article-title":"Precision livestock farming technologies for welfare management in intensive livestock systems","volume":"33","author":"Berckmans","year":"2014","journal-title":"Rev. Sci. Tech. 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Spatial Assessment of Livestock Heat Stress in Thessaly Region of Greece Using ERA5-Land Reanalysis and Temperature\u2013Humidity Index. Vet. Sci., 13.","DOI":"10.3390\/vetsci13050434"},{"key":"ref_13","unstructured":"European Commission (2003). Directive 2003\/65\/EC of the European Parliament and of the Council of 22 July 2003 amending Council Directive 86\/609\/EEC on the approximation of laws, regulations and administrative provisions of the Member States regarding the protection of animals used for experimental and other scientific purposes. Off. J. Eur. Union, L 230, 32\u201333."},{"key":"ref_14","unstructured":"FASS (2010). Guide for the Care and Use of Agricultural Animals in Research and Teaching, Federation of Animal Science Societies. [3rd ed.]."},{"key":"ref_15","unstructured":"NRC (1971). A Guide to Environmental Research on Animals, National Academy of Sciences."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1540","DOI":"10.2527\/2001.7961540x","article-title":"Effects of exposure to high ambient temperature and dietary protein level on sow milk production and performance of piglets","volume":"79","author":"Renaudeau","year":"2001","journal-title":"J. Anim. Sci."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1385","DOI":"10.2527\/2005.8361385x","article-title":"Effects of increasing temperatures on physiological changes in pigs at different relative humidities","volume":"83","author":"Huynh","year":"2005","journal-title":"J. Anim. Sci."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"278","DOI":"10.1016\/j.livsci.2006.04.029","article-title":"Effects of tropical climate and water cooling methods on growing pig responses","volume":"104","author":"Huynh","year":"2006","journal-title":"Livest. Sci."},{"key":"ref_19","first-page":"537","article-title":"Measurements of peripheral and deep body temperature in pigs\u2014A review","volume":"19","author":"Herbut","year":"2019","journal-title":"Ann. Anim. Sci."},{"key":"ref_20","first-page":"449","article-title":"The effect of body reserves at farrowing on the reproductive performance of first-litter sows","volume":"48","author":"Mullan","year":"1989","journal-title":"Anim. Prod."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"E123","DOI":"10.2527\/jas.2008-1452","article-title":"Ideal amino acid balance for sows during gestation and lactation","volume":"87","author":"Kim","year":"2009","journal-title":"J. Anim. Sci."},{"key":"ref_22","unstructured":"NRC (2012). Nutrient Requirements of Swine, National Academies Press. [11th rev. ed.]."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Papakonstantinou, G.I., Voulgarakis, N., Terzidou, G., Fotos, L., Giamouri, E., and Papatsiros, V.G. (2024). Precision Livestock Farming Technology: Applications and Challenges of Animal Welfare and Climate Change. Agriculture, 14.","DOI":"10.3390\/agriculture14040620"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"100367","DOI":"10.1016\/j.sbsr.2020.100367","article-title":"The role of sensors, big data and machine learning in modern animal farming","volume":"29","author":"Neethirajan","year":"2020","journal-title":"Sens. Bio-Sens. Res."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"E52","DOI":"10.3168\/jds.S0022-0302(03)74040-5","article-title":"Economic losses from heat stress by US livestock industries","volume":"86","author":"Cobanov","year":"2003","journal-title":"J. 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