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This study evaluated the effects of manual versus automated grading and Cobb breeder age (28\u201342, 43\u201356, and 57\u201370 weeks) on hatchability, chick quality, and embryonic mortality. The study was conducted in a commercial hatchery and a total of 54,432 fertile eggs were incubated and distributed in a completely randomized design in a 2\u2009\u00d7\u20093 factorial scheme (two sorting methods \u00d7 three age groups). Egg quality was first assessed by identifying cracked, dirty, inverted, and rejected eggs. Post-incubation, the study evaluated hatchability and chick quality (categorized into first and second grades). A detailed embryo diagnosis was performed to determine the incidence of rejects, embryonic mortality by stage, and the presence of live or dead pecked eggs. Data were statistically analyzed to evaluate the influence of classification methods and breeder age on key production performance indicators. This study revealed that breeder age significantly affected hatchability and incubation performance. Younger breeder hens demonstrated higher hatchability rates, whereas eggs from older breeder hens exhibited reduced incubation efficiency. In contrast, automated and manual grading systems showed comparable hatchability performance, with no significant differences observed between classification methods. These findings indicate that automated grading may be applied without negatively affecting hatchability outcomes across different breeder age groups.<\/jats:p>","DOI":"10.1007\/s11250-026-05417-8","type":"journal-article","created":{"date-parts":[[2026,10,18]],"date-time":"2026-10-18T17:12:49Z","timestamp":1792343569000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Breeder age outweighs egg grading method on hatchability and chick quality in broiler hatcheries"],"prefix":"10.1007","volume":"58","author":[{"given":"Jumara Coelho","family":"Ticiano","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberto Carlos","family":"de Freitas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luzianna Macedo","family":"Fonseca","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dauisia Corsino","family":"de Souza","sequence":"additional","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":"L\u00facio Francelino","family":"de Ara\u00fajo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arele Arlindo","family":"Calderano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,10,18]]},"reference":[{"key":"5417_CR1","unstructured":"ABPA - Brazilian Animal Protein Association (2025) Annual Report: chicken meat, pork, eggs, poultry genetics, and other proteins. 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