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Growth curve analyses in selected duck lines.

K Maruyama1, B Vinyard, M K Akbar

  • 1US Department of Agriculture, Gene Evaluation and Mapping Laboratory, Beltsville, Maryland, USA. kmaru@isc.meiji.ac.jp

British Poultry Science
|January 29, 2002
PubMed
Summary

Duck selection for market weight improved breast muscle yield and reduced abdominal fat over seven generations. Growth patterns showed increased asymptotes but constant inflection points, with variations between lines A and B in growth rates.

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Area of Science:

  • Animal Science
  • Quantitative Genetics
  • Poultry Breeding

Background:

  • Market weight selection in ducks aims to optimize meat yield and reduce fat deposition.
  • Understanding duck growth patterns is crucial for efficient breeding programs.
  • Previous studies have utilized various growth models to analyze poultry development.

Purpose of the Study:

  • To analyze and compare the growth patterns of four male duck lines selected for market weight.
  • To evaluate the impact of seven generations of selection on body weight, carcass traits, and abdominal fat.
  • To model duck growth using Weibull sigmoidal function, linear-linear relative growth rate, and allometry.

Main Methods:

  • Growth curves were analyzed using Weibull sigmoidal function, linear-linear relative growth rate model, and simple allometry.

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  • Ducks were fed ad libitum with 24-h lighting.
  • Body, carcass, breast muscle, leg/thigh muscle, and abdominal fat weights were measured weekly from hatch to 70 days in 16 ducks per line.

    • Main Results:

    • Line A exhibited the heaviest weight, followed by B, C, and D. No significant difference in body, carcass, or breast muscle weight at 49 days between lines A and B.
    • After seven generations, breast muscle yield increased to over 19%, and abdominal fat decreased to under 1.4% across all lines.
    • Weibull analysis showed increased asymptotes for body weight, with constant inflection points (21.3-26.0 days). Breast muscle growth lagged body weight by 12.8-14.3 days.

    Conclusions:

    • Seven generations of selection significantly enhanced breast muscle yield and reduced abdominal fat in all duck lines.
    • Growth curve analysis revealed increased asymptotic potential for body weight, indicating successful selection for larger mature size.
    • Relative growth rate models differentiated growth patterns between lines A and B, highlighting distinct body and breast muscle development trajectories.