Listening to Vincent Carton tell the story of his family business is akin to hearing a potted history of Irish trade. From 1775 when his relatives worked a local livery minding the horses of traders at Dublin’s market, to transforming it unrecognisably into Manor Farm, an international poultry business which by 2019 would be sold for €70 million to Scandi Standard, a Swedish PLC. In another family, to another leader, the sale of Manor Farm would signal closing curtains for the eighth-generation business, one of the oldest in Ireland. But Carton, who worked vigorously with his five daughters over several…