Table 1.
Ingredient and nutrient composition of experimental diet comparing sodium acetate to sodium bicarbonate DCAD control and equivalent carbon mass of butyrate as calcium butyrate1.
| Treatments2 |
|||
|---|---|---|---|
| Control | NaAc3 | CaBu4 | |
| Ingredients, % DM | |||
| Corn silage | 35.9 | 36.0 | 36.2 |
| Alfalfa haylage | 12.9 | 13.0 | 13.0 |
| Cracked corn | 10.9 | 11.0 | 11.0 |
| Canola meal | 10.5 | 10.6 | 10.6 |
| Bakery byproduct | 4.68 | 4.70 | 4.72 |
| Roasted soybeans | 4.68 | 4.70 | 4.72 |
| Molasses | 4.68 | 4.70 | 4.72 |
| Whole cottonseed | 4.29 | 4.30 | 4.32 |
| Grass hay | 3.90 | 3.91 | 3.93 |
| Ground corn | 2.34 | 2.35 | 2.36 |
| Mineral-vitamin mix5 | 1.61 | 1.61 | 1.61 |
| NPN6 | 0.39 | 0.39 | 0.39 |
| Sodium bicarbonate | 3.21 | ||
| Sodium acetate | 2.87 | ||
| Calcium butyrate | 2.47 | ||
| Nutrient composition, % DM | |||
| Crude protein | 14.6 ± 0.7 | 14.6 ± 0.7 | 14.7 ± 0.7 |
| Neutral detergent fiber | 30.7 ± 0.7 | 30.8 ± 0.7 | 30.9 ± 0.7 |
| Acid detergent fiber | 12.5 ± 0.1 | 12.5 ± 0.1 | 12.6 ± 0.1 |
| Starch | 18.7 ± 0.9 | 18.7 ± 0.9 | 18.8 ± 0.9 |
| Fatty acids | 4.31 ± 0.6 | 4.33 ± 0.6 | 4.35 ± 0.6 |
| Fatty acids, % of FA | |||
| C16:0 | 7.40 ± 1 | 7.43 ± 1 | 7.46 ± 1 |
| C18:0 | 2.87 ± 0.2 | 2.88 ± 0.2 | 2.89 ± 0.2 |
| C18:1, n-9 | 10.2 ± 1.5 | 10.2 ± 1.5 | 10.2 ± 1.5 |
| C18:2, n-6 | 18.8 ± 2.6 | 18.8 ± 2.6 | 18.9 ± 2.6 |
| C18:3, n-3 | 2.46 ± 0.09 | 2.47 ± 0.09 | 2.48 ± 0.09 |
| DCAD, mEq/100 g | 5.22± 0.17 | 4.78 ± 0.11 | 1.24 ± 0.002 |
Cows were fed the same basal TMR diet (1.67 Mcal / kg NEL) and treatments were mixed into the basal diet.
Treatments were sodium bicarbonate control (3.2% of diet DM), sodium acetate at 2.9% of diet DM (targeting 10 mol of acetate/d; NaAc; Food grade anhydrous sodium acetate, Kemin Industries, Inc., Des Moines, IA), calcium butyrate at 2.5% of diet DM (CaBu; Kemin Industries Inc.) to provide an equivalent carbon mass as NaAC treatment.
Acetate contained in NaAc provided 2.09 Mcal NEL/d
Butyrate contained in CaBu provided 2.65 Mcal NEL/d
Contained (%, as fed basis): 45.8 dried corn distillers grains with solubles; 35.8 limestone (38% Ca); 8.3 magnesium oxide (54% Mg); 6.4 salt; 1.73 vitamin ADE premix; 1.09 selenium premix (0.06% selenium); and 0.88 trace mineral mix.
Non protein nitrogen fed as a slow release urea (Optigen, Alltech Inc., Lexington, KY; 259% CP, DM basis).