Biostarter liquid is a formula containing mono-, di- and triglycerides of butyric acid, electrolytes, vitamin D3, vitamin C and aniseed essential oil, which are constituents of the digestive tract and influence the development of young birds. The elongation of intestinal villi and deepening of the crypts stimulates the absorption of nutrients from the feed intended for chicks. The appropriate level of electrolytes ensures homeostasis and is crucial in the incubation period. Biostarter liquid can be used together with antibiotics.