PROBLEM TO BE SOLVED: To provide a feed composition that can breed animals at least one of whose length rate of (length/withers height)×100, rump length/withers height ratio, and weight/withers height ratio is increased.SOLUTION: A fermentation product of a lactic acid bacterium (Lactobacillus gasseri) and a fermentation product of Propionibacterium (Propionibacterium freudenreich) are used in combination, and the fermentation products of the microorganisms are orally administered to animals.SELECTED DRAWING: None