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The aim of the study was to determine the relationship between the quality of colostrum and the formation of intestinal bacterial microflora in calves from birth to day 7. Seventy-five multiparous Polish Holstein-Friesian cows were selected. Colostrum samples were collected individually up to two hours after calving. The analysis was carried out on 75 calves; which were divided into three groups based on the colostrum quality class of the first milking. Faecal samples were collected rectally from each calf on its seventh day of life. Calves were weighed twice; on days 0 and 7 of life. It has been shown that with a higher concentration of colostrum protein fraction, primarily immunoglobulins, the colonisation of anaerobic bacteria occurs faster. Colostrum with a density &gt;1.070 g/cm 3 promoted the significant development of Lactobacilli and Bifidobacterium spp. which at the same time contributed to the reduction of unfavourable microflora, such as Coliforms or Enterococci . Regardless of the initial body weight, daily weight gains were highest for calves fed with colostrum with a density &gt;1.070 g/cm 3 . The study showed a significant influence of colostrum quality class on the formation of the intestinal microflora and the daily weight gains of calves.

Relationship between the Quality of Colostrum and the Formation of Microflora in the Digestive Tract of Calves