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The aim of the study was to analyze the content of immunoglobulin G in milk, with regards to selected physiological (age of cows, stage of lactation), environmental (production season, somatic cell count) and genetic (breed of cows) factors. The study included five breeds of dairy cows: i.e. Polish Holstein-Friesian – Black-White and Red-White varieties, Jersey, Simmental, Polish Red and Whiteback...
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