Table 1 Calculation of V-score
Indexa | Valueb | Individual index scorec |
|---|---|---|
Ammonia nitrogen (% TN) | XN ≤ 5 | YN = 50 |
|  | 5 < XN ≤ 10 | YN = 60–2XN |
|  | 10 < XN ≤ 20 | YN = 80–4XN |
|  | XN > 20 | YN = 0 |
Acetic acid + propionic acid (% FM) | XA ≤ 0.2 | YA = 10 |
|  | 0.2 < XA ≤ 1.5 | YA = (150–100XA)/13 |
|  | XA > 1.5 | YA = 0 |
Butyric acid (% FM) | 0 ≤ XB ≤ 0.5 | YB = 40–80XB |
|  | XB > 0.5 | YB = 0 |
V-score | YN + YA + YB | |