Effect of boiling and extraction on dry matter digestibility and intestine-digestible crude protein levels in plant residue following Chinese medicinal herb preparation

Authors Tian Xiue; Wan Meijiao; Wang Yongjun; Zhang Yang

Journal Acta Prataculturae Sinica , 2019,2:28

Abstract The aim of this study was to assess the effects of boiling and extraction on dry matter digestibility and intestine-digestible protein content of plant residue from production of Chinese herbal medicines.This information is relevant to assessing the usefulness of these residues for animal feeding.Using a mobile nylon bag technique, various digestive degradation kinetic parameters were determined for processing residues of Astragalus (Astragalus membranaceus),malt(Hordeum vulgare)and Licorice(Glycyrrhiza uralensis).Parameter estimates obtained for the three plant materials included:the effective degradability(ED)in the rumen of the main dry matter(DM)nutritive components(crude protein,neutral and acid detergent fiber;CP,NDF,ADF,respectively), the small intestine digestibility(Idg),and their rumen non-degradable dry matter(UDDM)and non-degradable protein(UDP)for both raw plant materials and after boiling and extraction.It was found that: 1)The EDDMand EDCPof the three tested residues after boiling and extraction were significantly lower than those of the untreated raw materials(P<0.05),while EDNDFand EDADFwere significantly higher than the untreated materials(P<0.05);2)The IdgUDDMand IdgUDPafter boiling and extraction,of the three tested Chinese herbal medicine preparation residues,were significantly higher than those of the untreated raw materials(P< 0.05);3)Boiling significantly increased the DDM of all 3 tested residues(P<0.05),and also the IdgCP,and IdgCP/CP of malt extract residue(P<0.05),but significantly reduced IdgCP,and IdgCP/CP of licorice extract residues and the IdgCPof Astragalus extract residues(P<0.05).These results indicate that it is not necessary to boil these feeds unless there is a special requirement to do so.Malt extract residues have good nutritional potential as a high-quality refined feed;Astragalus and licorice extraction residues have nutritional potential as a quality roughage.

Species covered 甘草 Glycyrrhiza uralensis 大麦 Hordeum vulgare 黄芪 Astragalus membranaceus