Table 1.
Basic information on small-scale pig farming in the study area (n = 168).
| Content | Quantity |
|---|---|
| Proportion of pig farms starting | |
| before 2001 | 15.30% |
| in 2001–2005 | 28.50% |
| after 2005 (until 2015) | 56.20% |
| Sows in a pig farm (head) | |
| range | 7–104 |
| median | 40 |
| Annual sold hogs from a pig farm (head yr−1) | |
| range | 70–980 |
| median | 500 |
| Average sold hog amount per sow (head) | 14 |
| Contribution of annual sold hog from small-scale pig farms to the total annual of the study county | 13.70% |
| Proportion of pig farms at a critical distance from village <500 m | 46.60% |
| Annual manure production (ton yr−1) | |
| range | 52–422 |
| median | 216 |
| Annual urine production (ton yr−1) | |
| range | 81–652 |
| median | 333 |
| Annual washing wastewater production (ton yr−1) | |
| range | 177–1524 |
| median | 773 |
| Proportion of manure removal by | |
| dry-cleaning | 63.70% |
| water flushing | 28.10% |
| both | 8.20% |
| Proportion of manure disposal by | |
| application to croplands and orchards | 50% |
| application to fish-raising waters | 50% |
| Proportion of wastewater disposal by | |
| discharge to water bodies | 65% |
| irrigating croplands and orchards | 35% |
| Percentage of pig farms mounted with biogas tank | 13.60% |