Table 3.
The effect of glycerol on milk yield and milk composition in dairy cows.
| Purity and Dose | Method of Administration | Cows and Time of Suplementation | Milk (kg/d) |
Fat (%) | Protein (%) | ECM a (kg/d) | FE | Reference | |
|---|---|---|---|---|---|---|---|---|---|
| Glycerol, 80.2% | 0 | Topdressed and hand-mixed into the upper 1/3 of the daily ration | Holstein cows, 14 d prepartum to 21 d pospartum. | 37.2 | 4.26 | 2.94 | 38.7 | - | DeFrain et al. [8] |
| 0.43 kg/d | 35.7 | 4.02 | 3.02 | 35.2 | |||||
| 0.86 kg/d | 34.0 | 4.26 | 2.97 | 35.0 | |||||
| Dry glycerol | 0 | Topdressed in TMR | From parturition to 3 weeks into lactation | 42.14 | 4.37 | 3.19 | 41.72 | 1.91 | Chung et al. [61] |
| 250 g/d | 44.57 | 4.00 | 3.09 | 42.04 | 2.07 | ||||
| Glycerol, 80.1% |
0% DM (corn silage-based diet) | Glycerol mixed with TMR | Holstein Cows 116 ± 13 DIM. 27-d periods for each diet |
34.4 | 3.10 | 2.88 | 29.6 | 1.19 | Shin et al. [35] |
| 5% DM (corn silage-based diet) | 35.6 | 3.20 | 2.86 | 31.3 | 1.25 | ||||
| 10% DM (corn silage-based diet) | 35.6 | 3.01 | 2.86 | 30.1 | 1.28 | ||||
| 0% DM (cottonseed hulls-based diet) | 37.7 | 3.15 | 2.95 | 32.8 | 1.19 | ||||
| 5% DM (cottonseed hulls-based diet) | 36.6 | 3.32 | 3.01 | 32.7 | 1.04 | ||||
| 10% DM (cottonseed hulls-based diet) | 36.4 | 3.05 | 3.00 | 31.3 | 1.07 | ||||
| Glycerol, 80%–85% |
0 | Mixed and the coated cottonseed was then added to the TMR | Holstein cows 4 weeks treatment |
37.9 | 3.46 | 2.76 | 37.6 | 1.55 | Boyd et al. [31] |
| 200g/d | 37.3 | 3.31 | 2.75 | 36.1 | 1.60 | ||||
| 400g/d | 35.5 | 3.35 | 2.81 | 34.6 | 1.51 | ||||
| Crude glycerol, 82.6% | 0 400 mL |
Oral drench | 4 to 21 d of lactation (date 3 period) | (kg/d) | - | - | Kass et al. [58] | ||
| 29.4 | 1.42 | 0.927 | |||||||
| 31.5 | 1.53 | 0.992 | |||||||
| Crude glycerol, 82.6% |
0 | Topdressed whit corn silage | 21 days (7 d of data collections in each period) |
17.9 | 3.17 | 3.03 | 0.95 | Ezequiel et al. [64] | |
| 15% of DM | 16.9 | 2.71 | 3.05 | 0.95 | |||||
| 30% og DM | 16.0 | 3.01 | 3.24 | 1.11 | |||||
| Glycerol, 99.5% |
300 mL of PG | Infusion in rumen for 4 d | Cannulated multiparous Holstein cows (22 ± 5 DIM) | 43.1 | 4.90 | 2.86 | Piantoni and Allen [22] | ||
| 300 mL of G | 42.3 | 4.48 | 2.97 | ||||||
| 600 mL of G | 42.6 | 4.66 | 2.90 | ||||||
| 300 mL of G + 300 mL of PG | 42.3 | 4.52 | 2.84 | ||||||
ECM—energy corrected milk yield; FE—feed efficiency = milk yield (kg/d)/DMI (kg/d). Mean values in the same row with different superscripts differ significantly (p < 0.05).