Physically adjusted neutral detergent fiber system for lactating dairy cow rations. I: Deriving equations that identify factors that influence effectiveness of fiber

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dc.contributor.authorWhite, Robin R.en
dc.contributor.authorHall, Mary Bethen
dc.contributor.authorFirkins, Jeffrey L.en
dc.contributor.authorKononoff, Paul J.en
dc.contributor.departmentDairy Scienceen
dc.date.accessioned2020-03-17T17:26:48Zen
dc.date.available2020-03-17T17:26:48Zen
dc.date.issued2017-12en
dc.description.abstractPhysically effective neutral detergent fiber (peNDF) is the fraction of neutral detergent fiber (NDF) that stimulates chewing activity and contributes to the floating mat of large particles in the rumen. Multiplying dietary NDF by particle size has been used as an estimate of peNDF. In re-evaluating the concept of peNDF, we compared the use of peNDF as dietary NDF x particle size with the use of individual NDF and particle size descriptors (physically adjusted NDF; paNDF) when used with other physical and chemical diet descriptors to predict dry matter (DM) intake (DMI), rumination time, and ruminal pH in lactating dairy cows. The purpose is to ultimately use these equations to estimate diet adequacy to maintain ruminal conditions. Each response variable had 8 models in a 2 (peNDF, paNDF) x 2 (diet, diet and ruminal factors) x 2 (DM, as fed basis) factorial arrangement. Particle size descriptors were those determined with the Penn State Particle Separator. Treatment means (n = 241) from 60 publications were used in backward elimination multiple regression to derive models of response variables. When available, peNDF terms entered equations. Models containing peNDF terms had similar or lower unadjusted concordance correlation coefficients (an indicator of similar or lower accuracy and precision) than did models without peNDF terms. The peNDF models for rumen pH did not differ substantially from paNDF models. This suggests that peNDF can account for some variation in ruminal pH; however, overt advantages of peNDF were not apparent. Significant variables that entered the models included estimated mean particle size; as fed or DM proportions retained on 19- and 8-mm sieves of the Penn State Particle Separator; DMI; dietary concentrations of forage; forage NDF; CP; starch; NDF; rumen-degraded starch and rumen-degraded NDF; and the interaction terms of starch x mean particle size, acid detergent fiber/NDF, and rumination time/DMI. Many dietary factors beyond particle size and NDF were identified as influencing the response variables. In conclusion, these results appear to justify the development of a modeling approach to integrate individual physical and chemical factors to predict effects on factors affecting rumen conditions.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.description.notesThe authors thank Keri Rogan and Jared Judy for their efforts related to data entry. Funding for this project was provided by Agriculture and Food Research Initiative Competitive grant no. 2015-03656 from the USDA National Institute of Food and Agriculture (Washington, DC). Research was supported by state and federal funds appropriated to the University of Nebraska-Lincoln, Virginia Tech (Blacksburg), and The Ohio State University (Columbus) with funding from USDA Agricultural Research Service (Washington, DC).en
dc.description.sponsorshipAgriculture and Food Research Initiative Competitive from the USDA National Institute of Food and Agriculture (Washington, DC) [2015-03656]; USDA Agricultural Research Service (Washington, DC)en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.3168/jds.2017-12765en
dc.identifier.eissn1525-3198en
dc.identifier.issn0022-0302en
dc.identifier.issue12en
dc.identifier.pmid28987580en
dc.identifier.urihttp://hdl.handle.net/10919/97338en
dc.identifier.volume100en
dc.language.isoenen
dc.rightsCC0 1.0 Universalen
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/en
dc.subjectchewing activityen
dc.subjecteffective fiberen
dc.subjectparticle sizeen
dc.subjectruminal pHen
dc.titlePhysically adjusted neutral detergent fiber system for lactating dairy cow rations. I: Deriving equations that identify factors that influence effectiveness of fiberen
dc.title.serialJournal of Dairy Scienceen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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