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Selection for feed conversion on efficiency and growth in mice

F C Gunsett, D H Baik, J J Rutledge

    Journal of Animal Science
    |June 1, 1981
    PubMed
    Summary
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    Selecting for feed conversion in mice significantly impacts growth and feed efficiency. This study reveals that selection for feed efficiency influences maintenance requirements but not the fundamental energy needs for growth.

    Area of Science:

    • Animal Science
    • Genetics
    • Nutritional Physiology

    Background:

    • Feed conversion efficiency is a critical trait in animal agriculture.
    • Understanding the genetic basis of feed efficiency is key to improving livestock production.
    • Previous studies suggest a complex interplay between feed intake, growth, and efficiency.

    Purpose of the Study:

    • To investigate the effects of selection for feed conversion on growth and feed efficiency in mice.
    • To estimate genetic parameters, including heritabilities and correlations, for feed efficiency traits.
    • To determine the correlated responses in growth and feed intake when selecting for feed efficiency.

    Main Methods:

    • Mice were subjected to selection for improved feed conversion.
    • Realized heritabilities and genic correlations were estimated for traits like increased gain on fixed feed intake (FF) and decreased feed intake on a constant gain (FG).

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  • Correlations with 56-day weight and comparisons of efficiency independent of maintenance were analyzed.

    • Main Results:

    • Selection for feed conversion significantly influenced growth and gross feed efficiency.
    • High realized heritabilities were observed for FF (.56) and FG (.73), with a strong negative genetic correlation (-.93) between them.
    • Correlations between FF/FG and 56-day weight were substantial (.67 and -.95, respectively), indicating indirect selection efficiency of 0.7.
    • Selected lines showed trends towards higher mature weight and feed intake compared to controls.

    Conclusions:

    • Selection for feed conversion ratio alters maintenance requirements rather than the energy requirements for growth itself.
    • The genetic architecture of feed efficiency involves complex correlations with growth and intake traits.
    • These findings have implications for breeding strategies aimed at enhancing feed efficiency in production animals.