Table 4.
Effect of cassava hay and rice bran oil on rumen fermentation characteristics and blood urea nitrogen in lactating dairy cows
| Items | Control1 | CH | RBO | CHRBO | SEM | Contrast
|
||
|---|---|---|---|---|---|---|---|---|
| RBO | CH | Int. | ||||||
| Ruminal pH | 6.9 | 6.8 | 6.9 | 6.8 | 0.05 | NS | NS | NS |
| NH3-N (mg/dl) | 12.1 | 13.0 | 12.7 | 11.6 | 0.49 | NS | NS | NS |
| BUN (mg/dl) | 13.4 | 14.7 | 14.2 | 13.1 | 1.26 | NS | NS | NS |
| Total VFA (Mm) | 102.2b | 115.9a | 102.1b | 107.7b | 2.29 | NS | * | NS |
| VFA (mol/100 mol) | ||||||||
| Acetate | 73.8a | 72.31ab | 67.5b | 70.5ab | 1.55 | * | NS | NS |
| Propionate | 16.8b | 18.3ab | 23.2a | 20.1ab | 1.56 | * | NS | NS |
| Butyrate | 9.4 | 9.4 | 9.2 | 9.4 | 0.24 | NS | NS | NS |
| C2:C3 | 4.4 | 4.0 | 3.9 | 3.0 | 0.38 | 0.08 | NS | NS |
| CH42 (mol/100 mol) | 32.3a | 31.2a | 27.8b | 29.9ab | 1.13 | * | NS | NS |
1
Control = Non-supplementation with CH and RBO; CH = Concentrate with CH; RBO = Concentrate with 4% RBO; CHRBO = Concentrate with CH plus 4% RBO; Int. = Interaction. NS = Non-significant difference (p>0.05).
*
p<0.05.
a,b
Values on the same row with different superscripts differ (p<0.05). SEM = Standard error of the mean.
2
Estimated: CH4 = (0.45×acetate)−(0.275×propionate)+(0.40×butyrate) (Moss et al, 2000).