This invention is in the field of animal food, in particular food for female animals in their reproductive phase. Food according to the invention improves the fertility of animals and increases their chances on a pregnancy. It was found that the fertility of animals may be improved by feeding the animal with a certain amount of naturally occurring immune enhancing ingredients such as beta-glucans and/or phytohormones like auxin or gibberellic acid. Also, combinations of these substances, in particular the combination of beta-glucans and phytohormones, were shown to have a synergistic effect in that they improved the fertility of the animal more than these individual components on their own.