(Adds details, background, byline) BUENOS AIRES, May 13 (Reuters) - The once-mighty but now cash-strapped Argentine soy crusher Vicentin said on Thursday it is starting talks to sell a majority stake to export firms Viterra, Molinos Agro and Argentine cooperative ACA. Argentina is the world’s No. 1 supplier of soymeal feed, used to fatten hogs and poultry from Europe to Southeast Asia. And family-owned Vicentin was the country’s top exporter of soy byproducts before falling into bankruptcy in 2019. “A majority group of Vicentin shareholders have accepted a non-binding expression of interest presented by three companies, with extensive experience in the industry, to evaluate the possibility of acquiring a majority stake,” Vicentin said in a statement.