Volatile fatty acid metabolism in sheep. 1. Average daily volatile fatty acid production in the rumen of sheep fed lucerne hay

dc.contributor.authorVan der Walt, J.G.
dc.contributor.authorBriel, B. J.
dc.contributor.editorBigalke, R.D.
dc.contributor.editorCameron, Colin McKenzie
dc.contributor.editorGilchrist, Frances M.C.
dc.contributor.editorMorren, A.J.
dc.contributor.editorVerster, Anna J.M.
dc.contributor.editorVerwoerd, Daniel Wynand
dc.contributor.editorWalker, Jane B.
dc.contributor.otherDe Kock, V.E.
dc.date.accessioned2016-07-06T10:41:58Z
dc.date.available2016-07-06T10:41:58Z
dc.date.created2016
dc.date.issued1976
dc.descriptionThe articles have been scanned in colour with a HP scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to final presentyation PDF-Format.en_ZA
dc.description.abstractChanges in the total concentration of the volatile fatty acid (VFA) pool in the rumen were followed over a 24 hour period in 2 groups of sheep, 1 fed at 08h00 and the other twice daily at 08h00 and 20h00. Although similar maximum (143 and 147 meq/l) and average (100,3 and 102,1 meq/l) levels were found in the 12 and 24 h groups respectively, the twice daily feeding regimen resulted in a lower variation (S.D. = I7,0 meq/l and 28,9 meq/l respectively). It was concluded from changes in the percentage molar composition of the VFA pool over the same period that the order of VFA absorption from the rumen was propionate > acetate > butyrate for both groups, but that the differences were less marked for the twice daily fed sheep. Long term infusions of ¹⁴C labelled acetic, propionic and butyric acids into the rumen of sheep fed a total of I 600 g lucerne hay twice daily (08h00 and 20h00), gave an average net total VFA production rate of 4, 52 ± 1 ,01 moles/800 g/12 hours irrespective of the acid infused. The net individual turnover rates for acetic (2,81 moles/ 12 h), propionic acid (0,82 moles/12 h) and butyric acid (0 , 55 moles/12 h), derived by the subtraction of the inter-conversion factors from the gross production rates of the acids, and expressed as the percentage contribution of each acid to the total net VFA turnover (acetic= 62%, propionic= 18% and butyric= 12%) closely resembled the percentage molar composition of the VFA pool in the rumen (acetic= 60%, propionic=23% and butyric= 12%). The total net VFA production was found to be directly proportional to the total VFA concentration in the rumen (correlation coefficient = 0, 83), and the relationship can be described by the equation y = 0,034 x + 0,16 where y= VFA production in moles/ 12 hour and x = VFA concentration in meq/l. A specific VFA production rate of 0,85 moles per 100 g digestible organic matter was calculated from the average daily VFA production rate and the composition of the lucerne hay.en_ZA
dc.identifier.citationVan Der Walt, JG & Briel, BJ 1976, 'Volatile fatty acid metabolism in sheep. 1. Average daily volatile fatty acid production in the rumen of sheep fed lucerne hay.’, The Onderstepoort Journal of Veterinary Research, vol. 43, no. 1, pp. 11-22.en_ZA
dc.identifier.issn0330-2465
dc.identifier.urihttp://hdl.handle.net/2263/53711
dc.language.isoenen_ZA
dc.publisherPublished by The Government Printer, Pretoriaen_ZA
dc.rights©1976 ARC - Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). ©2016 University of Pretoria. Department of Library Services (digital).en_ZA
dc.subjectVeterinary medicineen_ZA
dc.subject.lcshVeterinary medicine -- South Africa
dc.titleVolatile fatty acid metabolism in sheep. 1. Average daily volatile fatty acid production in the rumen of sheep fed lucerne hayen_ZA
dc.typeArticleen_ZA

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