Rates of production of acetate, propionate, and butyrate in the rumen of lactating dairy cows given normal and low roughage diets.

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dc.contributor.author Sutton, J. D.
dc.contributor.author Dhanoa, M. S.
dc.contributor.author Morant, S. V.
dc.contributor.author Schuller, E.
dc.contributor.author France, Jim
dc.contributor.author Napper, D. J.
dc.date.accessioned 2009-11-02T12:32:26Z
dc.date.available 2009-11-02T12:32:26Z
dc.date.issued 2003
dc.identifier.citation Sutton , J D , Dhanoa , M S , Morant , S V , Schuller , E , France , J & Napper , D J 2003 , ' Rates of production of acetate, propionate, and butyrate in the rumen of lactating dairy cows given normal and low roughage diets. ' Journal of Dairy Science , vol 86 , no. 11 , pp. 3620-3633 . en
dc.identifier.issn 0022-0302
dc.identifier.other PURE: 139849
dc.identifier.other dspace: 2160/3375
dc.identifier.uri http://hdl.handle.net/2160/3375
dc.identifier.uri http://jds.fass.org/cgi/reprint/86/11/3620.pdf en
dc.description Sutton, J. D., Dhanoa, M. S., Morant, S. V., France, J., Napper, D. J., Schuller, E. (2003). Rates of production of acetate, propionate, and butyrate in the rumen of lactating dairy cows given normal and low roughage diets.   Journal of Dairy Science, 86, 3620-3633. Sponsorship: Department of Environment, Food and Rural Affairs contract LS3608 and BBSRC en
dc.description.abstract Five lactating dairy cows with a permanent cannula in the rumen were given (kg DM/d) a normal diet (7.8 concentrates, 5.1 hay) or a low-roughage (LR) diet (11.5 concentrates, 1.2 hay) in two meals daily in a twoperiod crossover design. Milk fat (g/kg) was severely reduced on diet LR. To measure rates of production of individual volatile fatty acids (VFA) in the rumen, 0.5 mCi 1-14C-acetic acid, 2-14C-propionic acid, or 1-14C-nbutyric acid were infused into the rumen for 22 h at intervals of 2 to 6 d; rumen samples were taken over the last 12 h. To measure rumen volume, we infused Cr-EDTA into the rumen continuously, and polyethylene glycol was injected 2 h before the morning feed. Results were very variable, so volumes measured by rumen emptying were used instead. Net production of propionic acid more than doubled on LR, but acetate and butyrate production was only numerically lower. Net production rates pooled across both diets were significantly related to concentrations for each VFA. Molar proportions of net production were only slightly higher than molar proportions of concentrations for acetate and propionate but were lower for butyrate. The net energy value (MJ/d) of production of the three VFA increased from 89.5 on normal to 109.1 on LR, equivalent to 55 and 64% of digestible energy, respectively. Fully interchanging, three-pool models of VFA C fluxes are presented. It is concluded that net production rates of VFA can be measured in non-steady states without the need to measure rumen volumes. en
dc.format.extent 14 en
dc.language.iso eng
dc.relation.ispartof Journal of Dairy Science en
dc.title Rates of production of acetate, propionate, and butyrate in the rumen of lactating dairy cows given normal and low roughage diets. en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.3168/jds.S0022-0302(03)73968-X
dc.contributor.institution Aberystwyth University en
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en


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