Prevalence of pathogens causing subclinical mastitis in 15 dairy herds in the Republic of Ireland

Table 1 Distribution of bacterial isolates [number (%)] from 285 milk samples collected from dairy cows with subclinical mastitis (i.e., SCC > 200,000 cells/ml and CMT 2+) in split-calving and spring-calving herds

Farm	No. of samples	No. of growth	Staph. aureus	Strep. uberis	Strep. agalactiae	Strep dysgalactiae.	Mixed	Coagulase-negative Staph.	Coliforms	Minor pathogens	Contaminants
Split-calving herds
A	36	14 (39)	1 (3)	13 (36)	0	1 (3)	0	1 (3)	0	3 (9)	3 (9)
D	10	2 (20)	2 (20)	4 (40)	0	0	1 (10)	0	0	0	1 (10)
G	6	3 (50)	1 (16)	1 (16)	0	0	1 (16)	0	0	0	0
I	31	13 (42)	5 (16)	8 (26)	0	0	0	0	2 (6)	3 (10)	0
L	16	3 (19)	6 (38)	3 (19)	0	1 (6)	1 (6)	0	0	2 (13)	0
N	11	3 (27)	2 (18)	0	0	2 (18)	1 (9)	1 (9)	0	2 (18)	0
Total	110	38 (35)	17 (15)	29 (26)	0	4 (4)	4 (4)	2 (2)	2 (2)	10 (9)	4 (4)
Split-calving herds
B	12	0	6 (50)	0	0	0	4 (33)	1 (13)	1 (13)	0	0
C	13	3 (23)	0	9 (69)	0	0	0	0	1 (8)	0	0
E	33	5 (15)	10 (30)	6 (18)	0	0	2 (6)	6 (18)	0	4 (12)	0
F	20	3 (15)	11 (55)	2 (10)	0	0	0	3 (15)	0	1 (5)	0
H	6	1 (16)	3 (50)	0	0	0	1 (16)	1 (16)	0	0	0
J	37	14 (38)	7 (19)	7 (19)	0	2 (5)	2 (5)	1 (3)	2 (5)	2 (5)	0
K	24	6 (25)	7 (29)	0	0	0	0	8 (33)		3 (13)	0
M	11	0	0	0	7 (64)	0	2 (18)	0	0	2 (18)	0
O	19	7 (37)	0	0	0	0	1 (5)	4 (21)	3 (16)	4 (21)	0
Total	175	41 (25)	42 (24)	24 (14)	7 (4)	2 (1)	12 (7)	24 (14)	7 (4)	16 (9)	0
Total	285	77 (28)	61 (21)	53 (19)	7 (2)	6 (2)	16 (6)	26 (9)	9 (3)	26 (9)	4 (1)

ISSN: 2046-0481