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However, current recommendations for laying Japanese quails remain inconsistent due to variations among strains, production phases, and environmental conditions. In this study, the interactive effects between dietary metabolizable energy (ME) and digestible lysine (DL) on laying performance, egg quality, and profitability in quails reared in a climate-controlled environment were assessed. Birds were fed diets formulated to contain three ME levels (2600, 2875, or 3150\u00a0kcal\/kg) combined with four DL levels (0.90, 1.05, 1.20, or 1.35%) in a 3\u2009\u00d7\u20094 factorial arrangement. Responses were monitored over a 32-week experimental period divided into two consecutive 16-week phases (Phase I: 60 to 172 days; Phase II: 173 to 285 days of age). Compared with lower-ME diets, increasing dietary ME to 3150\u00a0kcal\/kg improved the laying percentage, egg mass, feed-to-egg ratio, and profitability (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009&lt;\u20090.05). Conversely, increasing dietary DL above the lowest level tested (0.90%) provided no additional productive or economic benefits, despite ME-dependent interactions affecting eggshell traits and body weight. These findings suggest that, in climate-controlled production systems, Japanese laying quails may benefit from greater dietary energy density than some current recommendations indicate, whereas additional DL supplementation above 0.90% was not associated with consistent improvements in laying performance and profitability. Therefore, high-energy diets formulated with 3150\u00a0kcal\/kg ME combined with 0.90% DL supported egg production and egg quality while improving feed efficiency and profitability under thermoneutral conditions.\n                  <\/jats:p>","DOI":"10.1007\/s11250-026-05412-z","type":"journal-article","created":{"date-parts":[[2026,10,18]],"date-time":"2026-10-18T17:10:53Z","timestamp":1792343453000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High-energy diets with reduced digestible lysine for Japanese laying quails under thermoneutral conditions: effects on laying performance, egg quality, and profitability"],"prefix":"10.1007","volume":"58","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5826-1874","authenticated-orcid":false,"given":"Ana Paula S.","family":"Ton","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2826-4617","authenticated-orcid":false,"given":"Lidiane","family":"Staub","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aldemar M.","family":"de Jesus","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3969-3065","authenticated-orcid":false,"given":"Anderson","family":"Corassa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5926-7314","authenticated-orcid":false,"given":"Adedoyin T.","family":"Amos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5641-8583","authenticated-orcid":false,"given":"Adriana G.","family":"do Amaral","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6819-8904","authenticated-orcid":false,"given":"Ednaldo A.","family":"de Andrade","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5796-0403","authenticated-orcid":false,"given":"Leonardo W.","family":"de Freitas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9322-2072","authenticated-orcid":false,"given":"Maicon","family":"Sbardella","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,10,18]]},"reference":[{"key":"5412_CR1","doi-asserted-by":"publisher","first-page":"103454","DOI":"10.1016\/j.psj.2024.103454","volume":"103","author":"ME Abd El-Hack","year":"2024","unstructured":"Abd El-Hack ME, Majrashi KA, Fakiha KG, Roshdy M, Kamal M, Saleh RM, Khafga AF, Othaman SI, Rudayni HA, Allam AA, Moustafa M, Tellez-Isaias G, Alagawany M (2024) Effects of varying dietary microalgae levels on performance, egg quality, fertility, and blood biochemical parameters of laying Japanese quails (Coturnix coturnix japonica). 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