Table 1.

The average number of somatic cells and lactose content in groups of animals

Group	N	Trait
		SCC		Lactose [%]
		Mean	SD	Mean	SD
CoPS1/2	14	3052	2089	3.97	0.98
CoPS3/4	14	7014	3443	3.63	0.83
CoNS1/2	7	447	403	4.67	0.12
CoNS3/4	9	3924	3091	4.08	1.12
H1/2	9	47	20	4.50	0.26
H3/4	9	550	183	4.41	0.42

SCC – somatic cell count.

SD - Standard deviation.

CoPS1/2 - coagulase-positive Staphyloccoci infected cows in 1^st and 2^nd lactations.

CoPS3/4 - coagulase-positive Staphyloccoci infected cows in 3^rd and 4^th lactations.

CoNS1/2 - coagulase-negative Staphyloccoci infected cows in 1^st and 2^nd lactations.

CoNS1/2 - coagulase-negative Staphyloccoci infected cows in 3^rd and 4^th lactations.

H1/2 - pathogen-free cows in 1^st and 2^nd lactations.

H3/4 - pathogen-free cows in 3^rd and 4^th lactations.