Last month, Ralcorp Holdings announced it would "aggressively" look to make acquisitions to expand its private-label operations, which are set to stand alone after a spin off of branded cereals business Post. The deal to buy Sara Lee's refrigerated dough unit is part of that strategy. However, there is still uncertainty over the future of the US company, with speculation over the intentions of ConAgra Foods, which made a bid for the whole business in May.