{
  "abstract": "This study evaluated mineral-based dietary interventions as a strategy to mitigate the age-related decline in egg production and quality commonly observed in late-cycle Lohmann Selected Leghorn laying hens. A completely randomized design was used with 294 hens at 90 wk of age assigned to 7 dietary treatments for 56 d:(1) basal control diet; (2) basal diet supplemented with 4 g/kg MgO; (3) basal diet supplemented with 50 mg/kg MnSO₄; (4) basal diet supplemented with 30 mg/kg ZnSO₄; (5) basal diet supplemented with MgO, MnSO₄, and ZnSO₄ at the respective levels; (6) basal diet containing 25% less available P than the control; and (7) basal diet containing 15% more Ca than the control. Supplementation with Mg or Mn increased feed intake, whereas the combined Mg + Mn + Zn treatment reduced feed consumption (P ≤ 0.05). All dietary treatments improved feed conversion ratio throughout the experimental period, and increased egg production during 94-98 wk of age (P ≤ 0.05), with no effect on egg mass (P > 0.05). The high-Ca diet increased specific gravity and shell thickness, Mg supplementation increased shell weight, and Mn supplementation enhanced shell thickness (P ≤ 0.05). Zinc supplementation, alone or in combination with Mg and Mn, reduced the incidence of damaged eggs (P ≤ 0.05).Dietary treatments had no significant effect on internal egg quality traits (P > 0.05), with the sole exception of Haugh unit values, which were significantly higher in hens supplied the high-Ca diet (P ≤ 0.05). Overall, targeted mineral interventions, particularly increased dietary Ca and supplementation with Mg, Mn, or Zn, improved selected production and eggshell quality traits in aged laying hens.",
  "abstract_shown": true,
  "affiliations": [
    "Animal Science Department, College of Agriculture and Natural Resources, Razi University, Kermanshah, 6715685423, Iran.",
    "Animal Science Department, College of Agriculture and Natural Resources, Razi University, Kermanshah, 6715685423, Iran. Electronic address: torki@razi.ac.ir."
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Shahab Pourlorestani"
    },
    {
      "affs": [
        1
      ],
      "name": "Mehran Torki"
    },
    {
      "affs": [
        0
      ],
      "name": "Reza Mahdavi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a3rr9314k4qnn.bib",
  "cited_by": 0,
  "doi": "10.1016/j.psj.2026.107880",
  "fulltext_url": "https://europepmc.org/articles/PMC13677389",
  "id": "a3rr9314k4qnn",
  "issns": [
    "0032-5791",
    "1525-3171"
  ],
  "landing_url": "https://europepmc.org/article/MED/42849230",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "1103|Animal Nutrition and Physiology"
    ]
  ],
  "openalex": "W7220359718",
  "pdf_url": "https://europepmc.org/articles/PMC13677389?pdf=render",
  "pmcid": "PMC13677389",
  "pmid": "42849230",
  "published": "2026-10-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a3rr9314k4qnn.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:10Z",
      "native_id": "MED:42849230",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42849230"
    }
  ],
  "subjects": [
    {
      "field": "biology",
      "origin": "openalex:1103|Animal Nutrition and Physiology",
      "subfield": "zoology-behaviour"
    }
  ],
  "title": "Effects of dietary mineral manipulation on productive performance and eggshell quality in laying hens during the late laying period.",
  "title_text": "Effects of dietary mineral manipulation on productive performance and eggshell quality in laying hens during the late laying period.",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:10Z",
  "url": "https://research.draconitic.com/paper/a3rr9314k4qnn",
  "venue": "Poultry science",
  "versions": []
}