TABLE 2:
Laboratory results and performance divided on training yards
| TY 1 | TY 2 | TY 3 | TY 4 | Sum | |
|---|---|---|---|---|---|
| Horses (n) | 36 | 10 | 14 | 3 | 63 |
| Horses excluded (n) | 1 | 0 | 2 | 0 | 3 |
| Horses added (n) | 0 | 0 | 2 | 0 | 2 |
| Sampling occasions* (n) | 314 | 110 | 126 | 34 | 584 |
| Additional sampling occasions† (n) | 20 | 3 | 0 | 1 | 24 |
| Horses with additional sampling occasions (n) | 16 | 3 | 0 | 1 | 20 |
| Sampling occasions (%) max: horse×13 |
67 | 83 | 69 | 100 | – |
| Horses without missing sampling occasions (%) | 0 | 20 | 0 | 100 | – |
| Positive PCR ERBV (n) |
5 | 0 | 0 | 0 | 5 |
| Positive PCR EHV-4 (n) |
0 | 1 | 1 | 0 | 2 |
| Titres above cut-off ERBV (n) | 67 | 23 | 17 | 26 | 133 |
| Titres above cut-off ERAV (n) | 32 | 12 | 27 | 7 | 79 |
| Titres above cut-off EHV-1, EHV-4 (n) | 44 | 18 | 2 | 0 | 64 |
| Fourfold rise titre ERBV (n) |
3 | 3 | 2 | 0 | 8 |
| Fourfold rise titre ERAV (n) |
3 | 0 | 0 | 0 | 3 |
| Fourfold rise titre EHV-1, EHV-4 (n) |
1 | 8 | 1 | 0 | 10 |
| Poor performance, total (n) | 54 | 23 | 15 | 4 | 96‡ |
| Poor performance, SFE (n) | 21 | 8 | 14 | 2 | 45 |
| Poor performance, according to trainer (n) |
33 | 16 | 1 | 2 | 52 |
| SAA above threshold (n) | 7 | 0 | 3 | 0 | 10 |
*The number of sampling occasions that were based on the regular monthly visits
†Additional sampling occasions due to events of poor performance and/or clinical respiratory signs, occurring outside regular sampling occasions
‡The 96 sampling occasions with poor performance included 52 which were based on trainers’ reports and 45 based on SFEs and 1 horse in which trainers’ report and SFE coincided
EHV, equine herpesvirus; ERAV, equine rhinitis A virus; ERBV, equine rhinitis B virus; n, number; SAA, serum amyloid A; SFE, standardised field exercise test; TY, training yard