Table 3.
Herd level prevalence of beef cows with at least one udder quarter with subclinical mastitis (SCC ≥200 000/ml), intramammary infection (IMI) of any bacteria, Staphylococcus aureus IMI, or no milk production (blind quarter) within a month after calving and at weaning in 10 beef cow herds
|
Variable |
After calving |
At weaning |
||
|---|---|---|---|---|
| Number of herds with ≥1 cow affected | Proportion of cows affected per herd median (range) | Number of herds with ≥1 cow affected | Proportion of cows affected per herd median (range) | |
| SCC ≥200 000/ml |
10 |
52 (18–67) |
9 |
69 (0–90) |
| Any IMI |
9 |
38 (0–67) |
10 |
43 (22–60) |
|
S. aureus IMI |
7 |
13 (0–33) |
9 |
21 (0–33) |
| Blind quarter | 6 | 9 (0–40) | 4 | 0 (0–40) |