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Selection for Feed Conversion on Efficiency and Growth in Mice¹

University of Wisconsin, Madison 53706

Abstract

Selection for feed conversion substantially influenced growth and gross feed efficiency of mice. Realized heritabilities and genie correlation for increased gain on fixed feed intake (FF) and decreased feed intake on a constant gain (FG) were estimated to be .56, .73 and -.93, respectively. The genie correlations between FF and 56-day weight and between FG and 56-day weight were estimated to be .67 and -.95, respectively. The relative efficiency in changing FF or FG by selecting directly for 56-day weight was found to be .7 in either case. When efficiency was defined as the incorporation of biomass independent of maintenance, no difference was found between selection treatments. Differences in mature weight and feed intake approached significance with selected lines having higher means than controls. The absence of a correlated response in the ability to use energy for growth indicates that selection for feed to gain ratio changes maintenance requirements but not requirements for growth.

¹ Paper No. 752 from the Dept. of Meat and Anim. Sci. Research supported by the College of Agricultural and Life Sciences.

² Present address: Farmers Hybrid, Inc., Des Moines, IA.

³ Present address: Jeonbuk University, Jeonju City, Korea.