Tyson , the world's largest poultry concern, is delaying its JV with Israeli conglomerate Tnuva "due to the security situation," according to a report by Globes Business. Tyson and Tnuva plan a joint subsidiary to market Tnuva's kosher poultry products in Europe. Tyson representatives planned to visit Israel last December "to close the deal," but have delayed their arrival due to a US State Department recommendation against visiting Israel.