engleski

Variation in nitrogen components of sheep milk in sub-Mediterranean area

The objective of this study was to evaluate the seasonal variation in urea content and other nitrogen compounds (protein, casein, non protein nitrogen content) of sheep milk as a tool for monitoring the protein nutritional status over the period of two years. The study was performed on three family farms with 150 to 300 sheep per farm using semi-extensive farming management based on pasture, typical for sub-Mediterranean area. Bulk-tank milk samples were taken during the entire milking period (from March to July or August, depending on the year) and were analyzed for protein, casein, non protein nitrogen (NPN) and urea content. Significant effect of the year was observed on urea and NPN content (P<0, 05). In addition, seasons had a significant effect on milk protein, urea and casein content (P<0, 01). Variations in nitrogen components of sheep milk in Dalmatian hinterland have been significant due to the fact that the semi-extensive farming systems could be strongly affected by climate which directly influence on the quantity and quality of pasture.

sheep milk; nitrogen components; sub-Mediterranean

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