Table 1.
Variables | Categories | No. of herds | No. of events | Veterinary treatment | |
No. | % | ||||
Young animals: | |||||
Herd level | |||||
Average SCC in test-milk | < 170 | 11 | 96 | 20 | 21 |
170–196 | 4 | 42 | 7 | 17 | |
196.1–236 | 9 | 69 | 27 | 39 | |
> 236 | 4 | 36 | 14 | 39 | |
Average udder disease score a | < 2.4 | 7 | 74 | 22 | 30 |
2.4–2.6 | 7 | 47 | 12 | 26 | |
2.61–2.7 | 4 | 38 | 7 | 18 | |
> 2.7 | 10 | 84 | 27 | 32 | |
Main breed | Swedish Red | 10 | 74 | 11 | 15 |
Swedish Holstein | 18 | 169 | 57 | 34 | |
Good record-keeping ability | Yes | 24 | 217 | 53 | 24 |
No | 4 | 26 | 15 | 58 | |
Participation | Only January | 2 | 11 | 5 | 45 |
All months | 26 | 232 | 63 | 27 | |
Veterinary district | Private | 11 | 84 | 16 | 19 |
State-employed | 17 | 159 | 52 | 33 | |
Disease event level | |||||
Age | < 2 months | 24 | 149 | 26 | 17 |
2–15 months | 17 | 54 | 14 | 26 | |
> 15 months | 20 | 40 | 28 | 70 | |
Study month | January | 25 | 116 | 26 | 22 |
April | 16 | 37 | 14 | 38 | |
July | 18 | 45 | 11 | 24 | |
October | 19 | 45 | 17 | 38 | |
Breed | Swedish Red | 15 | 65 | 6 | 9 |
SH | 23 | 167 | 57 | 34 | |
Mixed/Other | 6 | 11 | 5 | 45 | |
Disease | Cough | 12 | 52 | 17 | 33 |
Gastro-intestinal disorders | 22 | 96 | 7 | 7 | |
Lameness disorders | 14 | 28 | 19 | 68 | |
Other disorders | 17 | 67 | 25 | 37 | |
Cows: | |||||
Herd level | |||||
Main Breed | Swedish Red | 60 | 617 | 387 | 63 |
Swedish Holstein | 65 | 913 | 689 | 75 | |
Mixed/Other | 15 | 177 | 123 | 69 | |
Housing type | Tied | 107 | 1,066 | 721 | 68 |
Warm loose | 27 | 175 | 382 | 218 | |
Cold loose | 6 | 466 | 96 | 21 | |
Proportion of cows above third lactation | < 0.14 | 35 | 429 | 302 | 70 |
0.14–0.179 | 26 | 416 | 267 | 64 | |
0.18–0.24 | 39 | 430 | 313 | 73 | |
> 0.24 | 40 | 432 | 317 | 73 | |
Disease event level | |||||
Another animal with an event at the same date | Yes | 118 | 726 | 594 | 82 |
No | 140 | 981 | 605 | 62 | |
Breed | Swedish Red | 105 | 633 | 404 | 64 |
Swedish Holstein | 113 | 996 | 742 | 74 | |
Other | 35 | 78 | 53 | 68 | |
Culled | Not culled | 129 | 690 | 510 | 74 |
≤ 305 days after event | 136 | 736 | 505 | 69 | |
> 305 days after event | 115 | 281 | 184 | 65 | |
Days in milk | < 7 | 125 | 394 | 318 | 81 |
7–69 | 126 | 450 | 327 | 73 | |
70–168 | 125 | 435 | 292 | 67 | |
> 168 | 119 | 428 | 262 | 61 | |
Disease complex | Lameness disorders | 90 | 316 | 166 | 53 |
Metabolic disorders | 112 | 260 | 200 | 77 | |
Other disorders | 78 | 144 | 111 | 77 | |
Peripartum disorders | 77 | 124 | 96 | 77 | |
Udder disorders | 138 | 863 | 626 | 73 | |
Study month | January | 128 | 519 | 317 | 61 |
April | 120 | 353 | 227 | 64 | |
July | 111 | 436 | 349 | 80 | |
October | 116 | 399 | 306 | 77 | |
Pregnant | Yes | 91 | 237 | 161 | 68 |
No | 140 | 1,470 | 1,038 | 71 | |
Reason for culling | Not culled | 129 | 691 | 510 | 74 |
Milk | 56 | 102 | 60 | 59 | |
Udder | 121 | 405 | 281 | 69 | |
Other | 128 | 509 | 348 | 68 |
a The udder disease score is used to measure the probability of a cow having mastitis and is based upon a series of three monthly test day SCC results for the individual-cow [13].