(S (S (ADVP (RB Nationwide)) (COMMA ,) (S (BASENP (NN 355,000) (NNS birds)) (VP (VBP have) (VP (VBN been) (VP (VBN slaughtered) (PP (IN in) (NP (BASENP (DT an) (NN attempt)) (SBAR (S (VP (TO to) (VP (VB slow) (BASENP (DT the) (NN outbreak))))))))))))) (PERIOD .))