an epidemiological study of listeriosis in dairy cattle

Month of making
Y N OR (95% CL) p Value
May and before 59 411 1.00
June 23 250 0.64
July and after 6 64 0.63 0.08 X
number of cuts
type of harvester
1 R 13 145 1.00
2 43 382 1.26
3 27 180 1.67
4 2 9 2.48 0.09 X
forage harvester 58 468 1.0 (0.7-1.7) 0.9
discs and drums 33 287 0.9 (0.6-1.5) 0.75
mower conditioner 68 437 2.0 (1.2-3.4) 0.005*
combine harvester 2 3 5.6 (0.6-42) 0.16
wilting
wilted 89 749 0.40 (0.1-1.5) 0.22
additive use
days 0 R 4 12 1.00
1 61 487 0.38
2 23 181 0.38
3 5 78 0.19 0.12 X
used 34 267 1.1 (0.7-1.7) 0.8
inoculant 10 73 0.9 (0.4-1.99) 0.9
inoculant and
enzyme
16 84 1.7 (0.9-3.1) 0.1
enzyme 0 14 0.0 (0.0-3.4) 0.4
acid and salt 5 73 0.5 (0.2-1.4) 0.25
combinations 3 23 1.07 (0.3-3.8) 0.8
Grass silage