Table 1.
Local effects on milk after intramammary challenge of Q-/q-uniparous cows with S. aureus or E. coli
| Udder secretion scorea | Time (h) relative to S. aureus challenge | Time (h) relative to E. coli challenge | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 12 | 24 | 36 | 48 | 60 | 72 | 84 | 96 | 0 | 12 | 24 | |||||||||||||
| Q | q | Q | q | Q | q | Q | q | Q | q | Q | q | Q | q | Q | q | Q | q | Q | q | Q | q | Q | q | |
| Normal milk | 12 | 12 | 12 | 12 | 11 | 7 | 8 | 2 | 5 | 2 | 6 | 1 | 5 | 2 | 5 | 2 | 2 | 2 | 6 | 6 | 6 | 6 | 1 | 1 |
| Watery milk, no clots | 1 | 2 | 1 | 4 | 1 | 2 | 1 | 1 | ||||||||||||||||
| Milk, few small clots | 2 | 3 | 3 | 4 | 1 | 3 | 1 | 3 | 2 | 4 | 3 | 3 | 2 | 1 | ||||||||||
| Milk, several clots | 2 | 1 | 2 | 2 | 3 | 2 | 4 | 1 | 2 | 4 | 3 | 3 | 4 | 1 | ||||||||||
| Milk, many clots | 1 | 2 | 2 | 1 | 1 | 1 | 2 | 2 | ||||||||||||||||
| Serous milk, mainly clots | 1 | 1 | 1 | 3 | 2 | 2 | 1 | |||||||||||||||||
| Serum-like secretion | 1 | 1 | 2 | 1 | 1 | 1 | 3 | 3 | ||||||||||||||||
audder secretion score represents signs of inflammation in milk secretion. Animals with divergent haplotypes (Q/q) received intramammary challenge with S. aureus (24 animals (Q: n = 12 versus q: n = 12), 2 udder quarters) or E. oli (12 animals (Q: n = 6 versus q: n = 6), 1 udder quarter). For S. aureus-challenged animals, a mean score is given for two challenged udder quarters