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Coccidiosis

Last edited: 4/16/2026

Overview

Coccidiosis is an intestinal parasitic disease in broiler chickens caused by protozoan parasites of the genus Eimeria, leading to malabsorption, reduced performance, and impaired bone mineralization 1.

Diagnosis

  • Clinical signs include diarrhea, weight loss, and reduced feed efficiency 1.
  • Gross lesions observed in the small intestine, such as mucosal thickening and petechiae 1.
  • Histomorphometric analysis of intestinal tissue for increased coccidial oocyst burden 1.
  • Assessment of bone mineralization parameters, including radiographic and histological evaluations 1.
  • Management

  • First-line treatment: Supportive dietary adjustments, particularly in calcium (Ca) and phosphorus (P) levels, to mitigate the negative impacts of coccidiosis 1.
  • Vitamin D supplementation: Use of 25-hydroxycholecalciferol (OHD) over cholecalciferol (D3) may improve bone mineralization in broilers with marginal Ca/P deficiencies during coccidiosis 1.
  • Control measures: Implement biosecurity protocols and anticoccidial drugs as per standard veterinary guidelines, though specific drug classes and doses are not detailed in the provided abstracts 1.
  • Special Populations

  • No specific data provided for pregnancy, pediatrics, elderly, or comorbidities in broiler chickens 1.
  • Key Recommendations

  • Optimize dietary Ca and P levels, especially when using 25-hydroxycholecalciferol (OHD) for vitamin D supplementation, to enhance bone mineralization in coccidia-infected broilers (Evidence: Moderate) 1.
  • Monitor and manage intestinal health through histomorphometric analysis to assess the impact of coccidiosis on intestinal morphology (Evidence: Moderate) 1.
  • Implement biosecurity and consider anticoccidial drugs as part of routine management practices, though specific drug recommendations are not detailed in the provided abstracts (Evidence: Expert opinion) 1.
  • References

    1 Oikeh I, Sakkas P, Blake DP, Kyriazakis I. Interactions between dietary calcium and phosphorus level, and vitamin D source on bone mineralization, performance, and intestinal morphology of coccidia-infected broilers1. Poultry science 2019. link

    Original source

    1. [1]

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