THE EFFECT OF BREED, b-LACTOGLOBULIN VARIANTS AND SOMATIC CELL COUNT ON YIELD, CHEMICAL COMPONENTS AND WHEY PROTEIN COMPOSITION IN MILK OF NON-DAIRY SHEEP - A. Rozbicka-Wieczorek; A. Radzik-Rant; W. Rant; K. Puppel (Journal of Animal and Plant Sciences, 2015)