. 2006 Nov 24;48(1):24. doi: 10.1186/1751-0147-48-24

Table 1.

Herd size, production and herd health in Danish dairy herds. Characteristics of herd groups in the study.

	No. herds	End of one year study period	Herd size Cow years/year	Calculated bulk tank somatic cell count	Milk production Kg ECM/day	Mastitis treatments % cows treated/cow year	% of cows with infection risk > 50%
Conventional	20	03–2000	83	283	25.7^a	74^a	42
Organic before 1995	18	03–2000	88	296	22.1^c	48^b	38
Converting herds before conversion	19	04–1999 or 04–2000	87	317	24.6^a,b	61^a,b	42
Converting herds first year after conversion	19	04–2000 or 04–2001	101	337	23.3^c	52^a,b	44
Converting herds second year after conversion	19	04–2001 or 04–2002	107	327	23.8*	48^a,b	45
Conventional herds in full research project	109	03–2000	85	309	24.4^b	55*	43

Different letters: P < 0.05

*No comparison made