Types of pig as reported by the Agricultural Census.
| Agricultural Census Pig Categories for 1940-41 | 1961 |
|---|---|
| Sows in pig |
343,019
|
| Gilts in pig |
133,400
|
| Other Sows for breeding |
189,040
|
| Barren Sows for fattening |
16,883
|
| Boars for service |
39,132
|
| All other pigs: Over five months |
816,384
|
| All other pigs: Two to five months |
2,132,086
|
| All other pigs: Under two months |
1,339,463
|
| Date: | Source: |
|---|---|
| 1961 | Great Britain Historical GIS Project |
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From 1940 onwards, the Agricultural Census broke down both numbers of sows and numbers of other pigs.