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Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium
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Formation of optimal composite populations.

M D Macneil1

  • 1Roman L. Hruska U.S. Meat Animal Research Center, USDA-ARS, P.O. Box 166, 68933-0166, Clay Center, NE, USA.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|November 19, 2013
PubMed
Summary

Determining the optimal breed composition for composite populations maximizes bioeconomic objectives. A stepwise method identifies the ideal number of breeds for genetic improvement in livestock breeding programs.

Area of Science:

  • Animal Breeding and Genetics
  • Quantitative Genetics
  • Livestock Production

Background:

  • Composite populations are crucial for livestock genetic improvement.
  • Understanding breed contributions (straightbred and heterotic effects) is key to optimizing population structure.
  • Previous methods may not efficiently determine the ideal number of breeds for a composite.

Purpose of the Study:

  • To derive the optimal breed composition for a composite population.
  • To identify a unique breed composition that maximizes a bioeconomic objective.
  • To advocate for a method to determine the number of breeds in a composite population.

Main Methods:

  • Utilizing straightbred and average heterotic effects to define breed composition.
  • Applying a bioeconomic objective function to identify optimal proportions.

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  • Employing a forward stepwise approach to select the number of breeds.

    • Main Results:

    • A unique breed composition exists that maximizes the specified bioeconomic objective for any number of breeds (m).
    • The forward stepwise approach effectively determines the optimal number of breeds to include.
    • Simulated net returns demonstrated the efficacy of the derived optimal composite populations.

    Conclusions:

    • Optimal breed composition is achievable and maximizes economic returns in composite populations.
    • The proposed stepwise method provides a robust framework for designing elite composite breeds.
    • This approach has practical implications for enhancing genetic gain and profitability in animal agriculture.