What is <by-product> of <manure> ?
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What does manure produce as a by-product?
SELECT DISTINCT ?k WHERE { ?k property:by-product resource:manure }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2821> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q185716>. }
select distinct ?answer where { ?answer wdt:P2821 wd:Q185716}
animal husbandry