Table 2 Cow-level variables and associated IgG levels in 167 colostrum samples from 19 dairy herds in a specific region in Norway (Ringsaker municipality, Hedmark County)
Variable | Class or mean (SD) | Herds (N) | Samples (n) | IgG, g/L (SD) |
|---|---|---|---|---|
Parity | 1 | 19 | 53 | 41.5 (23.44) |
2 | 17 | 46 | 34.1 (18.98) | |
3 | 18 | 31 | 40.8 (25.48) | |
> 3 | 17 | 37 | 47.9 (26.51) | |
Udder emptied at (first) milking? | Yes | 19 | 101 | 44.3 (24.30) |
No | 18 | 62 | 39.1 (23.29) | |
Missing | 4 | 4 | 26.8 (21.54) | |
Length of dry period (days)*a | 67.0 (20.93) | 19 | 112 | 40.3 (24.04) |
Missing | 19 | 55 | 41.6 (23.28) | |
Time from calving to sampling (milking; h)*a | 3.5 (3.93) | 16 | 120 | 42.1 (24.82) |
Missing | 3 | 47 | 37.3 (20.56) | |
Milk yield at first milking (L) | 5.0 (2.71) | 19 | 163 | 41.5 (23.31) |
Missing | 4 | 4 | 19.8 (12.52) | |
Calving occurred in | Individual calving pen | 9 | 59 | 40.4 (18.80) |
Group calving pen | 2 | 9 | 42.7 (25.72) | |
Loose housing | 10 | 38 | 37.6 (18.31) | |
Tie stall | 3 | 25 | 48.9 (33.10) | |
Other | 10 | 28 | 35.1 (22.64) | |
Missing | 1 | 8 | 51.25 (39.62) | |
Calving ease | Spontaneous | 17 | 110 | 40.9 (24.65) |
Easy pull | 12 | 41 | 42.2 (22.22) | |
Hard | 3 | 3 | 54.0 (32.51) | |
Missing | 5 | 13 | 31.3 (17.37) | |
Antibiotic treatment at dry off?* | Yes | 6 | 9 | 46.1 (33.14) |
No | 15 | 71 | 41.3 (25.02) | |
Missing | 19 | 87 | 39.7 (21.68) | |
Leakage of colostrum prior to calving?*a | Observed | 17 | 42 | 35.2 (19.98) |
Not observed | 17 | 104 | 42.9 (24.52) | |
Missing | 2 | 21 | 41.1 (25.95) |