Dynamics of amino acids content of milk during the lactation period in Karakachan sheep
2005
Gerchev, G. (Institut po Planinsko Zhivotnovadstvo i Zemedelie, Troyan (Bulgaria)) | Mikhajlova, G. | Slavov, R.
The study was performed onn individual samples of sheep milk obtained during the lactation period (April-July) from Karakachan sheep, reared in the Sredna Stara Planina mountain region under grazing conditions, typical for mountainous regions of the country. The determination of amino acids of the total protein content was done via acid hydrolysis of samples with 6N hydrochloric acid at 110 C for 24h and dissolving the residue in a buffer with pH 2.2. The separation of the different amino acids was donne on an amino acid analyser (T 339 M, Mikrotechna, Praha). It was found that during the lactation period the highest amino acid concentrations were those of glutamic acid, followed by proline annd leucine. The total content of essential amino acids in sheep milk was highest in July (3.003 g/100 g milk) and lowest - in May (2.700 g/100 g milk). The amino acid levels except for those of glycine and proline, were highest when sheep were raised on the high-altitude pasture at 1500 m a.s.l. and lower on pastures at altitudes between 500-800 m a.s.l.
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