Show simple item record L. P. en_US Richard J. en_US William J. en_US D. en_US 2009-11-04T11:50:11Z 2009-11-04T11:50:11Z 2001-12 en_US
dc.identifier en_US
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 . , 10.3168/jds.S0022-0302(01)74726-1 en_US
dc.identifier.other PURE: 127243 en_US
dc.identifier.other dspace: 2160/3422 en_US
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_US
dc.format.extent 9 en_US
dc.relation.ispartof Journal of Dairy Science en_US
dc.subject concentrates en_US
dc.subject rumen pH en_US
dc.subject milk production en_US
dc.subject silages en_US
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_US
dc.contributor.pbl Aberystwyth University en_US
dc.contributor.pbl Institute of Biological, Environmental and Rural Sciences en_US

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