The head of Smithfield Foods sought to reassure U.S. legislators on Wednesday that the deal to sell the Virginia ham maker to China's largest pork producer would not jeopardize the safety or security of the American food supply.

"Smithfield will continue to produce pork in a safe and responsible way for U.S. consumers, in full compliance with the standards and the regulations of the USDA, FDA and other federal and state authorities," Smithfield President Larry Pope told the Senate Agriculture Committee in prepared testimony.

"We believe that this transaction has no impact on U.S. food supply and therefore no impact on 'food security,' Pope said.

The sale of Smithfield Foods, the world's largest pork producer with more than 46,000 employees in 25 states and four countries, to Shuanghui International Holdings for $4.7 billion would be the biggest Chinese takeover of a U.S. company to date.

Congress has no direct role in approving or blocking the transaction, but the Senate hearing sheds light on issues facing the Committee on Foreign Investment in the United States, a panel led by the Treasury Department that examines whether a foreign purchase of a U.S. company poses any national security risk.

"This is a precedent-setting case and we owe it to consumers, producers and workers to ensure we are asking the right questions and evaluating the long-term implications," Senate Agriculture Committee Chairman Debbie Stabenow said in a prepared opening statement.

"Smithfield might be the first (Chinese) acquisition of a major food and agricultural company, but I doubt it will be the last. That is why we must take a long-term view of what is happening," she said.

The Smithfield, Virginia-based company makes ham, sausage, bacon and other prepared meats under labels including Eckrich, Gwaltney, Armour. It has argued the deal is good for United States because it will boost pork exports, and good for China because it will help meet the country's growing demand for pork as hundreds of millions of Chinese move into the middle class.

But some have questioned what kind of production practices Shuanghui could bring to the United States, especially after revolting images this year of thousands of rotting pig carcasses floating down the Huangpu River that runs through Shanghai raised concerns about food safety practices in China.

Lawmakers have also expressed concern about the impact on the competiveness of U.S. pork production if Shuanghui gains access to Smithfield's valuable technology and hog genetics.

Stabenow noted that Shuanghui is offering to pay a 30 percent premium for Smithfield even though the American company has been struggling to make a profit.

"That, to me, raises questions about the economic motivations of the purchase. Is Shuanghui focused on acquiring Smithfield's technology, which was developed with considerable assistance by U.S. taxpayers?" Stabenow asked.

Pope did not directly address concerns over technology transfers in his prepared remarks, but said he expected the deal to "drive growth and expansion not only for our growers but for the entire U.S. pork industry."

"China is responsible for 50 percent of the world's pork consumption and their demand is still growing, whereas pork demand in the U.S. has been declining for almost 15 years," Pope told the agriculture panel.

The panel also heard from witnesses critical of deal, including Daniel Slane, a businessman who serves on the U.S.-China Economic and Security Review Commission, a watchdog panel established by Congress to monitor the Asian heavyweight.

Although Pope told senators the "Chinese government has absolutely no ownership stake or management control in Shuanghui," Slane painted a different portrait of the company, which he called state-controlled.

"Many of the largest Chinese enterprises, including Shuanghui, maintain strategic ties to the Chinese government, whether through direct ownership or control, preferential access to massive government subsidies and personal links to the Chinese government," Slane said in his prepared remarks.

Professor Usha Haley, director of the Robbins Center for Global Business and Strategy at West Virginia University, also questioned Shuanghui's independence and said it would likely continue to benefit from generous Chinese subsidies that would put pressure on other U.S. pork producers.

"U.S. competitors would be forced to reduce their profit margins to compete, and in this consolidated industry, cost-cutting and bankruptcies would ensue in a very short time, perhaps in as little as two to three years," Haley said.

The Shuanghui-Smithfield union provides China access to U.S. land, water, brands and technology, but "the risks are clearer than any long-term benefits" for the United States, she said.