RELATIONSHIPS BETWEEN CYTOLOGICAL QUALITY AND COMPOSITION OF MILK AND THE EFFECT OF SOME ENVIRONMENTAL FACTORS ON THE FREQUENCY OF RECURRENT MASTITIS IN COWS
2007, 8 (3) p. 295-300
Data on somatic cell counts (SCC) in test-day milkings of 63621 cows from the active population of the Pomerania and Kujawy regions were analysed for the years 1998–2002. A negative correlation was found between SCC and milk yield (r= -0.19xx) and lactose content (r= -0.38xx) and a positive correlation was found between SCC and fat (r= 0.07xx) and protein content (r= 0,25xx). The chi2 test revealed significant (p≤0.01) differences in the frequency of cows with recurrent mastitis according to all the factors analysed (age of cows (lactation 1, 2, 3 and 4+), milk yield of the herd (<4 000, 4 001–5 000, 5 001–6 000 and >6 000 kg milk), herd size (<10, 10.1–20, 20.1–100, 100.1–200 and >200 cows) and year of calving (1998, 1999, 2000, 2001 and 2002)). Age of cows was the most differentiating factor.