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The study was carried out during the grazing period (April-July) with a group of 5 local sheep of the Srednostaroplaninska breed in 3 rd lactation. The following system of animal raising was used: grazing on a mountain pasture (April and May), supplementation in April and alpine grazing on high-mountain pastures (June and July). Samples were taken every month during milking period (April-July). Chemical composition of milk and amino acid composition of protein were studied by ion exchange column chromatography. The objective of the study was to determine the chemical composition and biological protein value of milk from Srednostaroplaninska sheep breed. The amino acid content in milk protein, namely glutamic acid, proline, lysine, alanine, valine and serine, increased with advance of lactation period, whereas that of the limiting amino acid methionine decreased and subsequently increased till the end of the period. The protein of milk from the Srednostaroplaninska breed had an index of 35.35 % and a biological value of 90.8 %. The sward type and vegetation stage exerted an influence on the content of essential amino acids, biological value and chemical index of protein of sheep's milk.

Chemical composition and biological protein value of milk from local Srednostaroplaninska sheep breed