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Loop-mediated Isothermal Amplification (LAMP) Assays for the Species-specific Detection of Eimeria that Infect Chickens
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Published on: February 20, 2015

Meta-analysis of the performance variation in broilers experimentally challenged by Eimeria spp.

Marcos Kipper1, Ines Andretta, Cheila Roberta Lehnen

  • 1Departamento de Microbiologia e Parasitologia, Universidade Federal de Santa Maria, Brazil; Departamento de Zootecnia, Universidade Federal de Santa Maria, Brazil. mar.kipper@gmail.com

Veterinary Parasitology
|February 13, 2013
PubMed
Summary

Coccidia infection in broilers impacts weight gain, even without reduced feed intake. The age of the broiler significantly influences the severity of Eimeria infection effects on performance.

Keywords:
CoccidiaEimeria acervulinaEimeria maximaEimeria tenellaPrediction

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Published on: September 20, 2021

Area of Science:

  • Poultry Science
  • Animal Parasitology
  • Veterinary Medicine

Background:

  • Eimeria species are significant protozoan parasites affecting broiler chickens globally.
  • Coccidiosis in broilers leads to substantial economic losses due to impaired growth and feed efficiency.
  • Understanding the specific impacts of different Eimeria species on broiler performance is crucial for effective disease management.

Purpose of the Study:

  • To analyze the relationship between feed intake and weight gain in broilers infected with specific Eimeria species (E. acervulina, E. maxima, E. tenella) or a pool of species.
  • To identify and quantify the effects of Eimeria infections on broiler performance metrics.
  • To investigate the influence of Eimeria species, age, sex, and genetic line on infection outcomes.

Main Methods:

  • A meta-analysis was conducted using data from 69 publications, encompassing approximately 44,000 broiler chickens.
  • The meta-analysis involved graphical, correlation, and variance-covariance analyses to assess performance data.
  • Feed intake, weight gain, and feed conversion ratio were the primary performance indicators analyzed.

Main Results:

  • Eimeria maxima and Pool infections increased feed intake by 8% and 5% respectively, while E. acervulina and E. tenella did not significantly alter feed intake.
  • All challenged groups exhibited reduced weight gain compared to controls, irrespective of feed intake changes.
  • Feed intake variation showed a quadratic influence on weight gain variation across Eimeria-infected broilers.
  • Individual Eimeria challenges accounted for less than 1% of the variance in feed intake and weight gain, with effects varying by species, age, sex, and genetics.
  • Broiler age was found to be a more significant factor than the challenge itself in determining the impact of Eimeria infection.

Conclusions:

  • Eimeria infections negatively impact broiler weight gain, even when feed intake is not reduced.
  • The specific Eimeria species and host factors like age, sex, and genetic line modulate the severity of performance decrements.
  • Broiler age is a critical determinant of susceptibility and response to Eimeria infections, highlighting the importance of age-specific management strategies.