Rumen acid production from dairy feeds. 1. Effects on feed intake and milk production of dairy cows offered grass or corn silages

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dc.contributor.author Borgida, L. P.
dc.contributor.author Dewhurst, Richard J.
dc.contributor.author Fisher, William J.
dc.contributor.author Wadhwa, D.
dc.date.accessioned 2009-11-04T11:50:11Z
dc.date.available 2009-11-04T11:50:11Z
dc.date.issued 2001-12
dc.identifier.citation Borgida , L P , Dewhurst , R J , Fisher , W J & Wadhwa , D 2001 , ' Rumen acid production from dairy feeds. 1. Effects on feed intake and milk production of dairy cows offered grass or corn silages ' Journal of Dairy Science , vol 84 , no. 12 , pp. 2721-2729 . en
dc.identifier.issn 0022-0302
dc.identifier.other PURE: 127243
dc.identifier.other dspace: 2160/3422
dc.identifier.uri http://hdl.handle.net/2160/3422
dc.identifier.uri http://www.adsa.org/JDS/papers/2001/d01C2721.pdf en
dc.description Dewhurst, R. J., Wadhwa, D., Borgida, L. P., Fisher, W. J. (2001). Rumen acid production from dairy feeds. 1. Effects on feed intake and milk production of dairy cows offered grass or corn silages.   Journal of Dairy Science, 84, (12), 2721-2729. en
dc.description.abstract Earlier studies developed a new approach to feed evaluation, measuring the net acid load that develops during rumen fermentation. Two concentrates were formulated to be isoenergetic and isonitrogenous, with extremes of rumen acid load. A third treatment comprised a 50:50 mixture of these concentrates. These concentrates were evaluated along with ryegrass silage and corn silage. The feeds were evaluated in a continuous culture system adapted to deliver and record the quantities of acid or alkali needed to maintain a constant pH (6.2 to 6.3). This study confirmed the anticipated ranking of concentrates for rumen acid load, as well as the highly acidogenic nature of corn silage. The concentrates were formulated to balance corn silage and were offered to early-lactation Holstein-Friesian cows at 50% of dry matter intake, with either ryegrass silage or corn silage. Feed intake was lower for animals offered corn silage-based diets (17.4 vs. 22.2 kg of dry matter/d). Increasing concentrate acid load led to a large decline in dry matter intake for corn silage, although not for grass silage. Feed intake effects were reflected in significant effects on yield of milk (31.0, 29.9, and 26.9 kg/ d for low-, medium-, and high-acid load concentrates, respectively) and milk solids. Milk protein concentration was unaffected by concentrate type with corn silage diets but tended to be higher when high acid load concentrates were fed with grass silage. This may reflect the effect of the high starch concentrate rectifying a shortage of glucogenic precursors or microbial protein with the grass silage-based diet. en
dc.format.extent 9 en
dc.language.iso eng
dc.relation.ispartof Journal of Dairy Science en
dc.subject concentrates en
dc.subject rumen pH en
dc.subject milk production en
dc.subject silages en
dc.title Rumen acid production from dairy feeds. 1. Effects on feed intake and milk production of dairy cows offered grass or corn silages en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.3168/jds.S0022-0302(01)74726-1
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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