Abstract
The aim of the research was to compare the amino acid composition of colostrum and milk of the most current dairy cattle breed (Holstein-Friesian) and that of other breeds that occur less frequently. Breeds were kept at the same farm, other factors affecting colostrum and milk composition such as housing system and feed regime were kept at the same level. Amino acid analysis was carried out following acidic hydrolysis of proteins with an amino acid analyser with post-column derivatization. The amino acid content of colostrum differed on the third day of lactation. Holstein- Friesian cows contained more lysine, isoleucine, leucine, valine, phenylalanine, and threonine than that of Swedish red, Jersey, Brown Swiss and Norwegian red cows (P < 0.05). The decrease of the amino acid content in the function of time followed the decline of protein content. The composition of colostrum proteins showed some changes in terms of the increase of the ratio of the nonessential glutamic acid and proline, and decrease of the ratio of threonine. The amino acid composition of milk proteins of the examined breeds differed only slightly. The higher protein content of the milk of concentrated-milk-breeds was accompanied with higher essential amino acid content.
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