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Related Experiment Videos

An allometric-autoregressive approach to poultry development.

M J Belt1, N H Casey, G A Smith

  • 1Department of Livestock Science, University of Pretoria, Republic of South Africa.

British Poultry Science
|May 1, 1992
PubMed
Summary

Chicken strain and crude protein levels significantly impact growth and body composition. Broiler and layer strains show different responses to dietary protein during development.

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Area of Science:

  • Animal Science
  • Poultry Nutrition
  • Growth Physiology

Background:

  • Understanding chicken development is crucial for optimizing broiler and layer production.
  • Dietary protein levels are key factors influencing growth rates and body composition in poultry.
  • Genetic differences between commercial layer and broiler strains necessitate strain-specific nutritional strategies.

Purpose of the Study:

  • To investigate the relative rates of development in commercial layer and broiler chicken strains.
  • To assess the impact of two crude protein levels (180 or 230 g/kg) on chicken development.
  • To analyze developmental changes across pre-pubertal and pubertal phases using an allometric-autoregressive model.

Main Methods:

  • Utilized an allometric-autoregressive model to analyze growth dynamics.
  • Compared development in commercial layer and broiler strains.
  • Fed diets containing 180 g/kg or 230 g/kg crude protein.
  • Divided developmental analysis into pre-pubertal (0-8 weeks) and pubertal (8-22 weeks) phases.

Main Results:

  • Significant strain effects were observed in live body mass, carcass mass, non-carcase mass, and empty-body mass across all ages.
  • Strain differences were also significant in carcass, non-carcase, and empty-body moisture, protein, and fat content.
  • Dietary crude protein levels significantly affected carcass and empty-body fat in the pre-pubertal phase.
  • In the pubertal phase, dietary protein influenced live mass, non-carcase protein, and carcass fat.

Conclusions:

  • Chicken strain is a major determinant of growth rate and body composition.
  • Dietary crude protein levels differentially affect growth and fat deposition depending on the developmental phase and strain.
  • Optimizing dietary crude protein is essential for maximizing performance in both broiler and layer strains, considering their distinct developmental patterns.

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