PURPOSE: To obtain the subject feed increasing weight of domestic animals by adding the feed to them, by adsorbing a culture filtrate of butyric acid bacteria on processed by-products of agricultural product, drying the by-products under specific pressure and temperature conditions under reduced pressure, inexpensively recovering active ingredients in the culture filtrate of butyric acid bacteria without losing the active ingredients of components.
CONSTITUTION: A culture filtrate of butyric acid bacteria is adsorbed on processed by-products of agricultural product such as dried beet pulp and the resulting material is dried under reduced pressure under ≤600mmHg, preferably ≤400mmHg at ≤80°C, preferably ≤70°C to give the objective feed. The amount of the feed is ≥10g based on 1kg weight of horse or cattle as a domestic animal daily, 30g based on 1kg weight of pig, preferably 60g for a growing pig with 2kg weight and 2kg for a growing cattle with 200kg weight.
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