Table 3.
Distribution of all quarter clinical mastitis cases before the next visit by selected study variables
| Quarter case of clinical mastitis |
|||||
|---|---|---|---|---|---|
| 1 |
0 |
||||
| Variable | All cases (n = 929) | E. coli (n = 171) | Strep. uberis (n = 121) | (n = 61,030) | |
| Parity | 1 | 131 (14.7) | 22 (12.9) | 16 (13.3) | 16,330 (27.1) |
| 2 | 177 (19.9) | 41 (24.1) | 26 (21.7) | 13,450 (22.3) | |
| 3 | 170 (19.1) | 38 (22.4) | 18 (15.0) | 10,143 (16.8) | |
| >3 | 411 (46.3) | 69 (40.6) | 60 (50.0) | 20,402 (33.8) | |
| Missing1 | 40 | 1 | 1 | 705 | |
| Lactation month | 1 | 125 (14.1) | 23 (13.5) | 22 (18.3) | 5,055 (8.4) |
| 2 | 106 (11.9) | 18 (10.6) | 15 (12.5) | 4,974 (8.2) | |
| 3 | 94 (10.6) | 16 (9.4) | 9 (7.5) | 4,902 (8.1) | |
| >3 | 563 (63.4) | 113 (66.5) | 74 (61.7) | 45,394 (75.3) | |
| Missing | 41 | 1 | 1 | 704 | |
| UHS2 | 1 | 485 (59.7) | 79 (55.2) | 60 (56.6) | 37,699 (65.3) |
| 2 | 183 (22.5) | 33 (23.1) | 30 (28.3) | 12,369 (21.4) | |
| 3 | 95 (11.7) | 22 (15.4) | 12 (11.3) | 5,377 (9.3) | |
| 4 | 49 (6.0) | 9 (6.3) | 4 (3.8) | 2,307 (4.0) | |
| Missing | 117 | 28 | 15 | 3,278 | |
| TEC3 | N | 64 (8.6) | 10 (7.0) | 15 (15.0) | 4,002 (7.5) |
| 1A | 195 (26.1) | 34 (23.9) | 28 (28.0) | 16,414 (30.8) | |
| 1B | 250 (33.5) | 46 (32.4) | 32 (32.0) | 19,613 (36.8) | |
| 1C | 32 (4.28) | 4 (2.8) | 4 (4.0) | 2,346 (4.4) | |
| 2A | 79 (10.6) | 14 (9.9) | 9 (9.0) | 5,706 (10.7) | |
| 2B | 61 (8.2) | 16 (11.3) | 5 (5.0) | 2,805 (5.3) | |
| 2C | 26 (3.5) | 5 (3.5) | 3 (3.0) | 1,229 (2.3) | |
| 2D | 35 (4.7) | 13 (9.5) | 4 (4.0) | 510 (1.0) | |
| Missing | 187 | 19 | 21 | 6,506 | |
These quarter cases of clinical mastitis were missing relevant information and were discarded from the final models.
Udder hygiene score: 1 = completely free or very little dirt; 2 = slightly (2-10% of the area) covered in dirt; 3 moderately (10-30% of the area) covered in dirt; 4 = covered (>30% of the area) with caked-on dirt.
Teat-end callosity score: N = normal teat end; 1A = thin smooth callosity ring; 1B = moderate smooth callosity ring; 1C = thick smooth callosity ring; 2A = thin rough callosity ring; 2B = moderate rough callosity ring; 2C = thick rough callosity ring; 2D = extreme rough callosity ring (severe hyperkeratosis of the teat end).