Variables | Level of choline chloride (g/2days)a | SEM | P values | ||
---|---|---|---|---|---|
 | 0 | 4 | 8 |  |  |
Average daily milk yields, ml/d | 659d | 771c | 697cd | 77.34 | 0.039 |
Average daily milk yields, g/d | 678d | 793c | 717cd | 77.34 | 0.039 |
Average daily 4Â % FCM yields, g/d | 756d | 943c | 870cd | 91.28 | 0.004 |
Total milk yields 12 weeks, kg | 56.90d | 66.54c | 60.18cd | 6.53 | 0.034 |
Feed conversion ratiob | 1.58c | 1.31c | 1.41d | 0.07 | <0.0001 |
Milk composition, % | Â | Â | Â | Â | Â |
 Fat | 4.77c | 5.26d | 5.42c | 0.07 | <0.0001 |
 Protein | 3.49d | 3.61c | 3.65c | 0.10 | 0.012 |
 Lactose | 6.23d | 6.28d | 6.56c | 0.09 | <0.0001 |
 Specific gravity | 1.028 | 1.028 | 1.028 | 0.00 | 0.251 |
 Solid non fat | 10.19d | 10.47c | 10.45cd | 0.09 | 0.009 |
 Total solids | 15.24d | 15.45cd | 15.87c | 0.45 | 0.036 |
Milk constituents yields, g/d | Â | Â | Â | Â | Â |
 Fat | 32.29d | 41.71c | 38.86c | 4.02 | 0.001 |
 Protein | 23.63d | 28.63c | 26.17cd | 2.78 | 0.013 |
 Lactose | 42.18d | 49.77c | 47.00cd | 6.46 | 0.039 |
 Solid non fat | 70.93d | 80.76c | 74.88c | 10.63 | 0.009 |
 Total solids | 103.24d | 122.45c | 113.71cd | 11.97 | 0.038 |
Income over feed cost, U$ | 0.93d | 1.11c | 0.97cd | 1.883 | 0.037 |