Table 1. Concentration and purity of total RNA extracted from milk fat, whey and somatic cells.

	Cow number	Concentration (ng/ml)	OD260/280	OD260/230	RNA integrity number
Milk fat	12	242.3	2.1	2.1	2.2
	16	173.5	2.1	2.1	2.5
	710	125	2.2	2.3	NA
	7134	152.8	2.1	2.1	3.2
Milk whey	12	147.5	2	1.6	2.7
	16	73.1	2	0.7	2.6
	710	49.9	1.9	1.1	NA
	7134	74.8	1.9	1.3	2.7
Milk cell	12	145.2	2.1	1.8	7.3
	16	136	2.2	1.9	8.3
	710	264.2	2.1	1.9	8
	7134	186.6	2.1	2	6.7

Note: NA = Not available (not determined by Bioanalyzer 2100).