A 'rapid response' team of investigators from the US Department of Agriculture has embarked upon a probe of Tyson Foods. The investigation relates to Tyson's planned restructuring of its swine business. Tyson plans to sever ties with 132 hog producers, as well as closing company-owned and leased farms. Some 200 jobs will be lost. The company says the move is necessary to protect the long-term health of the rest of the business, and that the division is running at an operating loss.