Table 3 Nitrogen (N) utilization and ruminal microbial protein synthesis by heifers fed a barley straw diet before and after rumen content transfers from the bison.
Item | Rumen transfers | SEM | P-value | |
|---|---|---|---|---|
Before | After | |||
N intake, g/day | 151 | 179 | 3.8 | <0.01 |
Fecal N, g/day | 55 | 60 | 1.5 | <0.01 |
Urine N, g/day | 90 | 108 | 2.7 | <0.01 |
Retained N (RN), g/day | 5.3 | 13.2 | 2.57 | 0.03 |
RN/N intake, % | 3.2 | 7.2 | 1.53 | 0.07 |
RN/digested N, % | 4.9 | 10.6 | 2.34 | 0.09 |
RN, g/kg of BW0.75 | 0.054 | 0.113 | 0.0310 | 0.14 |
Total purine derivatives, mmol/day | 100.5 | 110.1 | 3.41 | 0.02 |
Allantoin, mmol/day | 94.8 | 103.4 | 3.07 | 0.02 |
Uric acid, mmol/day | 5.7 | 6.7 | 0.49 | 0.06 |
Microbial purines absorbed, mmol/day1 | 74.2 | 83.4 | 3.96 | 0.03 |
Microbial N flow, g/day1 | 53.9 | 60.6 | 2.88 | 0.03 |
Microbial N flow, g/kg of BW0.75 | 0.556 | 0.597 | 0.0249 | 0.17 |
Microbial N, g/kg of DOM2 | 16.9 | 16.7 | 0.84 | 0.77 |
