The Orthodox Union (OU) has told its approved beef purveyors in South America to stop using a controversial slaughter method.

The OU, which is the largest kosher certifying agency in the United States, sent a letter to its meat purveyors in June notifying them that it would no longer accept meat slaughtered using the “shackle and hoist” method, said Rabbi Menachem Genack, CEO of the organization’s kosher division.

The letter came after Israel decided to ban import of any meat slaughtered using the method, in which the animal is pulled into the air by its legs and then flipped onto the ground before being slaughtered. Critics of the method, which is commonly used in South America but not permitted in Israel, say it puts unnecessary stress on the animal and is inhumane.

Israel’s agriculture department banned the method for imported meat last year and gave slaughterhouses, many of which also produce kosher meat sold to the U.S., until June 1, 2018, to comply. The Israeli policy said that slaughterhouses had to install rotating pens to turn the animal upside down, which is seen as more humane than using shackle and hoist.

On Monday, Genack told JTA he expects all slaughterhouses certified by the OU will stop the practice by the end of September. He estimated that about a third of the beef certified by the OU for sale in the United States comes from South America, with the rest being slaughtered in the U.S. and Canada, where the shackle and hoist method is not used.

“The OU for a very long time has been focused on this, trying to promote slaughter in the pen of beef, so we’re happy that Israel took that step,” Genack said.