highly significantP < 0.001
The differences between group HN and each of the other groups were highly significant ( P < 0.001) during the first two weeks (single crates, K0), however, in the following observation period (group housing, K1) group HN did not differ in terms of diarrhoea prevalence from groups C and CN ( P > 0.05) and samples were significantly more often of liquid or semi-liquid character than in group H ( P < 0.001).