Table 4.
Means ± SD for milk yield and milk composition during and after the treatment period1.
| Control (n = 5) | CLA (n = 5) | |||||||
|---|---|---|---|---|---|---|---|---|
| 1 - 28 DIM | 29 - 56 DIM | 1 - 28 DIM | 29 - 56 DIM | |||||
| Variable | mean5 | SD | mean | SD | mean | SD | mean | SD |
| milk yield2, kg/day | 24.5 | 2.8 | 28.8 | 2.3 | 24.5 | 3.3 | 28.9 | 2.1 |
| 3.5% FCM3, kg/day | 30.9 | 5.4 | 34.7 | 5.7 | 30.4 | 2.6 | 33.0 | 3.5 |
| milk fat4, % | 6.10 | 0.99 | 5.27 | 0.78 | 5.77 | 0.14 | 4.97 | 0.30 |
| milk fat4, kg/day | 1.49 | 0.15 | 1.52 | 0.12 | 1.41 | 0.16 | 1.44 | 0.12 |
| milk protein4, % | 3.81 | 0.12 | 3.31 | 0.13 | 3.82 | 0.15 | 3.42 | 0.13 |
| milk protein4, kg/day | 0.93 | 0.09 | 0.95 | 0.07 | 0.94 | 0.09 | 0.99 | 0.08 |
| milk lactose4, % | 4.75 | 0.28 | 5.02 | 0.03 | 4.72 | 0.25 | 4.94 | 0.02 |
| milk lactose4, kg/day | 1.17 | 0.25 | 1.43 | 0.03 | 1.14 | 0.28 | 1.42 | 0.02 |
| urea4, mmol/L | 6.25 | 1.14 | 5.28 | 1.27 | 5.63 | 1.26 | 5.38 | 0.96 |
1CLA supplemented timeframe: d 1 till d 28 of lactation; five primiparous cows received a special supplement including rumen-protected CLA (10 g c9,t11-CLA/day and t10,c12-CLA/day).
2Milk yield was recorded at each milking.
3FCM was calculated like following: (fat [%] × 0.15 + 0.4) × milk yield [kg/day]
4Milk composition was analyzed once daily in the first week after parturition and twice a week from week 2 until week 8 postpartum.
5Milk yield and milk composition values were reduced to weekly means, means from wk 1 till 4 are pooled to timeframe 1 - 28 DIM, means from week 5 till 8 are pooled to timeframe 29 - 56 DIM