Some characteristics and mineral components of milk of cattle breeds kept in Czechoslovakia
1991
Hanus, O. | Foltys, V. (Vyzkumny Ustav pro Chov Skotu, Rapotin (CSFR))
Chemical composition and other characteristics of milk were investigated in 191 bulk samples of milk of a part of the population of cows belonging to four breeds of the whole Czechoslovakia. The objective of the investigation, which took place at six research workplaces, was to record the present situation and to provide information for the norm-setting activities. The average value of titratable activity was 7.00 (2.5 mmol/l), of souring 26.5 (2.5 mmol/l), pH value is 6.64, contents of calcium, inorganic phosphorus, potassium, sodium and chlorides 117, 79, 127, 44, 110 mg per 100 g, respectively, and somatic cell counts (SB) xa=309 +-211, and/or xg=243 thousand/ml. The effects of year season, breed lactation order and laboratory on the above-mentioned values were tested. The lactation order increases significantly the contents of sodium, chlorides and somatic cell counts, and reduces titratable acidity. The effect of breed was significant in most parameters under study. There were also differences between the laboratories. Mutual relations were demonstrated between the titratable acidity of milk and chloride content (r=-0.28), and/or somatic cell counts (r=0.26), and between the content of chlorides and somatic cell counts (r=0.33).
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