Show simple item record J. D. en_US M. S. en_US S. V. en_US E. en_US Jim en_US D. J. en_US 2009-11-02T12:32:26Z 2009-11-02T12:32:26Z 2003 en_US
dc.identifier en_US
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 . , 10.3168/jds.S0022-0302(03)73968-X en_US
dc.identifier.other PURE: 139849 en_US
dc.identifier.other dspace: 2160/3375 en_US
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_US
dc.format.extent 14 en_US
dc.relation.ispartof Journal of Dairy Science en_US
dc.title Rates of production of acetate, propionate, and butyrate in the rumen of lactating dairy cows given normal and low roughage diets. en_US
dc.contributor.pbl Aberystwyth University en_US
dc.contributor.pbl Institute of Biological, Environmental and Rural Sciences en_US

Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search Cadair

Advanced Search