LONDON (Reuters) – Britain’s pig industry said on Monday it faces collapse after an exodus of east European workers led to a shortage of butchers and a backlog in slaughtering more than 170,000 pigs. National Pig Association (NPA) Chairman Rob Mutimer and National Farmers Union (NFU) President Minette Batters said emergency visa measures designed to soften the impact of Brexit and COVID-19 were not working. “The situation is utterly dire on pig farms, both in terms of the backlog, and financially,” the groups said in a joint letter to Britain’s environment minister George Eustice. In October, …