use of a bacterial amylase, methods to prepare a composition, to increase the milk production of animals of the bovine subfamily, to increase the fat thickness on the back of animals of the bovine sfufamily, to increase the weight gain and / or conversion ratio animal feed of the bovinae subfamily, and to improve the apparent digestibility and / or disappearance of dry foodstuffs in animals of the bovinae subfamily, and, use of a bacterial amylase, methods to prepare a composition, to increase milk production of bovine subfamily animals, to increase the thickness of fat on the back of bovine subfamily animals, to increase weight gain and / or proportion of feed conversion of bovine subfamily animals, and to improve apparent digestibility and / or disappearance dry matter of foodstuffs in animals of the subfamily bovinae, and, composition