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dc.contributor.authorNarvaez, Nelmy
dc.contributor.authorBrosh, Arieh
dc.contributor.authorMellado, Miguel
dc.contributor.authorPittroff, Wolfgang
dc.date.accessioned2020-09-05T07:00:26Z
dc.date.available2020-09-05T07:00:26Z
dc.date.issued2011-01-01
dc.identifier.citationNarvaez, N., Brosh, A., Mellado, M., & Pittroff, W. (2011). Performance of sheep and goats fed Arctostaphylos canescens with and without polyethylene glycol supplementation. Rangeland Ecology & Management, 64(1), 85-91.
dc.identifier.issn0022-409X
dc.identifier.doi10.2111/REM-D-09-00037.1
dc.identifier.urihttp://hdl.handle.net/10150/642846
dc.description.abstractArctostaphylos canescens Eastw. is considered an important element in the chaparral fire matrix and an invasive plant in coniferous forest plantations in California. Previous studies reported that dry matter intake of Arctostaphylos was low, presumably because of its low nutritional quality and high condensed tannin (CT) content. We hypothesized that intake and digestibility of Arctostaphylos could be increased by the provision of a tannin-complexing agent polyethylene glycol (PEG). This study determined the effects of PEG (MW 4000) supplementation on intake (I) and digestibility (D) of Arctostaphylos in goats and sheep. Polyethylene glycol was added to drinking water at four levels (0.3%, 0.15%, 0.05%, and 0%) of body weight (BW). Alfalfa pellets were used as diet supplement at 1.5% of BW. Nutritional quality of Arctostaphylos was low as compared with alfalfa pellets. Arctostaphylos crude protein (CP) levels were low (4.5% vs. 17.9%) and CT concentration was high (23.1% vs. 0%), whereas estimates of in vitro organic matter digestibility (OMD, 36.6%) and metabolizable energy (5.1 MJ kg-1 dry matter [DM]) in Arctostaphylos were almost half of those found for alfalfa pellets (70.3% and 9.5 MJ kg-1 DM). A curvilinear increase (P < 0.05) in nutrient intake (per g d-1 and per kg BW 0.75) was observed in goats and sheep as PEG levels increased, although a linear increase (P<0.001) was observed in CP intake (g d-1) of Arctostaphylos by goats. Addition of PEG curvilinearly increased (P < 0.05) digestibility of DM, CP, and neutral and acid detergent fiber, but quadratically increased (P < 0.05) that of OM in goats and sheep. Incorporation of PEG in drinking water at the level of 0.15% BW in sheep and goats was effective to maximize inactivation of CT in Arctostaphylos. However, the success in adopting this practice as a useful tool in vegetation management programs will depend on the cost-benefit ratio. 
dc.language.isoen
dc.publisherSociety for Range Management
dc.relation.urlhttps://rangelands.org/
dc.rightsCopyright © Society for Range Management.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectchaparral
dc.subjectfuels management
dc.subjectmanzanita
dc.subjectshrub management
dc.subjecttannins
dc.titlePerformance of Sheep and Goats Fed Arctostaphylos canescens With and Without Polyethylene Glycol Supplementation
dc.typetext
dc.typeArticle
dc.identifier.journalRangeland Ecology & Management
dc.description.collectioninformationThe Rangeland Ecology & Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform August 2020
dc.source.volume64
dc.source.issue1
dc.source.beginpage85-91
refterms.dateFOA2020-09-05T07:00:26Z


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