Table 2 Number of animals tested (n = 979), mean and standard deviation of milk variables and Β- hydroxybutyrate concentration (BHB) in blood according to lactation number.
From: Gene association analysis of an osteopontin polymorphism and ketosis resistance in dairy cattle
Item | Lactation 1 | Lactation 2 | Lactation 3 | Lactation 4 | Lactation 5 | Lactation ≥ 6 |
|---|---|---|---|---|---|---|
N | 326 | 291 | 197 | 87 | 50 | 28 |
BHB | 0.47 ± 0.24 | 0.44 ± 0.21 | 0.47 ± 0.35 | 0.43 ± 0.28 | 13.22 ± 92.87 | 0.47 ± 0.30 |
Milk variables | ||||||
Milk | 24.84 ± 9.53 | 27.96 ± 13.12 | 27.77 ± 14.13 | 24.65 ± 12.02 | 23.71 ± 12.85 | 20.18 ± 8.93 |
Fat | 4.08 ± 0.86 | 4.17 ± 0.89 | 4.02 ± 0.82 | 3.97 ± 0.77 | 4.03 ± 0.78 | 4.03 ± 0.69 |
Protein | 3.60 ± 0.35 | 3.57 ± 0.36 | 3.49 ± 0.35 | 3.43 ± 0.36 | 3.43 ± 0.37 | 3.46 ± 0.33 |
Lactose | 4.91 ± 0.19 | 4.82 ± 0.58 | 4.74 ± 0.22 | 4.72 ± 0.23 | 4.66 ± 0.24 | 4.67 ± 0.29 |
Dry matter | 13.33 ± 1.53 | 17.64 ± 76.81 | 12.99 ± 1.35 | 12.93 ± 0.99 | 12.65 ± 2.04 | 12.62 ± 2.34 |
Urea | 235.82 ± 66.04 | 251.29 ± 101.93 | 250.27 ± 55.00 | 252.49 ± 61.73 | 254.06 ± 55.66 | 250.53 ± 67.09 |
SCC | 172.46 ± 394.66 | 228.40 ± 473.98 | 344.50 ± 778.30 | 376.34 ± 919.72 | 479.15 ± 829.54 | 825.31 ± 2425.46 |
