According to Defra, the English pig census stood at 3.78 million head on December 1, 2019, 2.7% higher than in 2018. The last time the December census had reached that level was in 2007.
The number of female breeding pigs decreased 1% from the year prior, and there was a noticeable 12% decline in suckling and dry sows (Other sows).
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
Source: Defra June and December Surveys of Agriculture
March 9, 2020 - 333 Staff with information from Defra