- The farm number indicates the origin farm of the corresponding animal. Grey shades indicate grading of eggs per gram of feces (low: ≤ 1000 epg, medium: 1000–3000 epg, high: > 3000 epg) and milk spots (0 = no milk spots; 1 = low: < 5, 2 = medium: 5–20, 3 = high: > 20)