By DAVID BILLER and JOSHUA GOODMAN, Associated Press Writer RIO DE JANEIRO (AP) — The owner of the world's largest meatpacker pleaded guilty in U.S. federal court on Wednesday to paying nearly $180 million in bribes to top Brazilian officials in exchange for state-backed financing used to go on a buying spree in the U.S. Sao Paulo-based J&F Investimentos, the controlling shareholder of JBS SA, pleaded