Tyson Foods Inc. said Tuesday it has agreed to buy the poultry rendering and blending assets of American Proteins Inc. and Ampro Products Inc. for $850 million. Tyson expects the deal to general net sales of more than $550 million over the next 12 months, as it will enable it to recycle more animal products for feed, pet food and aquaculture and expand its animal feed ingredient business. "Rendering plays a key role in growing our business and helping us deliver on our sustainability goals," said Tyson Chief Executive Tom Hayes. "Through this important business, no part of the animal goes to waste, and we can recycle valuable ingredients into feed for pets and aquaculture." The stock fell 1.7% in morning trade. It has shed 12.3% over the past three months, while the S&P 500 has slipped 0.8%.