Table 1 Age, milk production and stage of lactation in cows of three breeds and two age groups
Breed | Age group | Age (years) mean ± sd | Milk production (kg/day) mean ± sd | Stage of lactation (weeks) mean ± sd |
|---|---|---|---|---|
Brown Swiss (n = 100) | young | 2.5 ± 0.50 | 27.4 ± 2.86 | 8.4 ± 3.53 |
old | 4.8 ± 0.88 | 30.3 ± 5.01 | 10.0 ± 4.54 | |
combined | 3.6 ± 1.35 | 28.8 ± 4.27 | 9.2 ± 4.14 | |
Holstein Friesian (n = 100) | young | 2.5 ± 0.50 | 32.8 ± 7.13 | 10.8 ± 4.75 |
old | 4.9 ± 0.77 | 36.0 ± 9.05 | 1.2 ± 5.67 | |
combined | 3.7 ± 1.36 | 34.4 ± 8.31 | 12.0 ± 5.37 | |
Swiss Fleckvieh (n = 100) | young | 2.4 ± 0.49 | 29.0 ± 4.29 | 11.1 ± 5.33 |
old | 4.7 ± 0.78 | 33.8 ± 6.41 | 10.2 ± 4.85 | |
combined | 3.6 ± 1.33 | 31.4 ± 5.96 | 10.7 ± 5.11 | |
All young cows (n = 150) | 2.5 ± 0.50 | 29.7 ± 5.53 | 10.1 ± 4.75 | |
All old cows (n = 150) | 4.8 ± 0.79 | 33.4 ± 7.41 | 11.1 ± 5.25 | |
All cows (n = 300) | 3.6 ± 1.35 | 31.5 ± 6.79 | 10.6 ± 5.04 | |