Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Critics have claimed toxins from landfarms could have an effect on the milk produced by cows that graze the land, and Fonterra announced in 2013 it was to stop picking up milk from any new landfarms in Taranaki.

Answer: product_or_material_produced: Fonterra, milk