Types of pig as reported by the Agricultural Census.
| Agricultural Census Pig Categories for 1920-30 | 1931 |
|---|---|
| Sows kept for Breeding |
422,849
|
| Boars for service |
27,855
|
| Other Pigs |
2,494,507
|
| Date: | Source: |
|---|---|
| 1931 | Great Britain Historical GIS Project |
| 1931 | Department of Agriculture and Fisheries for Scotland, Scottish Agricultural Statistics (HM Stationery Office) , |
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Between 1920 and 1930, the Agricultural Census distinguished breeding sows and boars for service from all other pigs.