0 2 0 http://purl.obolibrary.org/obo/LPT_0000198 milk beta-hydroxybutyrate content 'milk beta-hydroxybutyrate content' SubClassOf 'milk composition trait' http://purl.obolibrary.org/obo/LPT_0000197 milk glycerophosphocholine content 'milk glycerophosphocholine content' SubClassOf 'milk composition trait'