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| Dietary manipulation (1) |
| Excretion (1) |
| Free-stall dairy (1) |
| Holstein heifers (1) |
| Agriculture (1) |
| Air quality (1) |
| Ammonia emission (1) |
| Cattle manure (1) |
| Crude protein (1) |
| Dairy cows (1) |
| Dietary manipulation (1) |
| Excretion (1) |
| Free-stall dairy (1) |
| Holstein heifers (1) |