EFFECT OF SIMPLE PHENOLIC-COMPOUNDS OF HEATHER (CALLUNA-VULGARIS) ON RUMEN MICROBIAL ACTIVITY IN-VITRO

Citation
Ah. Murray et al., EFFECT OF SIMPLE PHENOLIC-COMPOUNDS OF HEATHER (CALLUNA-VULGARIS) ON RUMEN MICROBIAL ACTIVITY IN-VITRO, Journal of chemical ecology, 22(8), 1996, pp. 1493-1504
Citations number
39
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Ecology,Biology
Journal title
ISSN journal
0098-0331
Volume
22
Issue
8
Year of publication
1996
Pages
1493 - 1504
Database
ISI
SICI code
0098-0331(1996)22:8<1493:EOSPOH>2.0.ZU;2-5
Abstract
Heather (Calluna vulgaris), a common dietary component of many mammali an herbivores, contains a broad range of tannin phenolics, flavonoids, and simple phenolic compounds. These may lead to a number of negative effects on herbivores as a result of toxicity or digestive inhibition , We assessed the effect of some simple phenolic compounds from heathe r on rumen microbial activity using the in vitro consecutive batch cul ture technique. The compounds tested were orcinol, quinol, and arbutin , a glucoside of quinol. At a concentration of 10 mM, both orcinol and quinol depressed production of gas and volatile fatty acids (VFAs). O rcinol and, to a lesser extent, quinol also reduced digestion of the s ubstrate. In contrast to these negative effects on rumen microbial fer mentation, arbutin stimulated both gas and VFA production, probably du e to the presence of the fermentable sugar moiety. The presence of arb utin also resulted in different concentrations and proportions of VFAs compared to the presence of orcinol and quinol. Since many simple phe nolic compounds are found in plants in the form of glycosides, the neg ative digestive effects of the phenolic moieties may be accompanied by the positive effect of the sugar moiety, which is liberated in the ga strointestinal tract on hydrolysis by glycosidase enzymes. This study suggests that when phenolics are present as glycosides, they do not ne cessarily adversely affect digestion by herbivores.