Effects of barley silage chop length on productivity and rumen conditions of lactating dairy cows fed a total mixed ration

Journal of Dairy Science
M S EinarsonK M Wittenberg

Abstract

Barley silage, cut at the early dough stage, was chopped long (19 mm) or short (10 mm), ensiled, and incorporated into total mixed rations (TMR). The TMR contained (dry matter [DM] basis) either 58.0 or 41.4% concentrate and either short- or long-chopped barley silage. Reducing chop length of barley silage decreased the proportion (asis basis) of TMR particles retained by the 8- and 19-mm screens of the Penn State Particle Separator (PSPS) from 66.9 to 52.7% in the high concentrate TMR and from 74.8 to 60.9% in the low concentrate TMR. Chop length reduction decreased dietary physically effective fiber, calculated as the NDF retained by the 8- and 19-mm screens of the PSPS, from 29.2 to 25.2% DM in the high concentrate TMR and from 34.9 to 30.6% DM in the low concentrate TMR. Reduction in chop length did not affect rumen pH, total rumen volatile fatty acids, milk yield, and milk composition, but increased DM intake from 19.4 to 20.1 kg/d at the high level of concentrate and from 16.9 to 17.7 kg/d at the low level of concentrate and increased rumen propionate. Increasing the concentrate inclusion rate reduced rumen pH from 6.52 to 6.35, did not affect total volatile fatty acids, reduced the acetate-to-propionate ratio from 3.1 to...Continue Reading

References

Sep 1, 1983·Journal of Dairy Science·D A LahrR G Lundquist
May 1, 1997·Journal of Dairy Science·J E Nocek
Jul 1, 1997·Journal of Dairy Science·D R Mertens
Oct 26, 2000·Journal of Dairy Science·H W SoitaJ J McKinnon
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Feb 10, 2004·Journal of Dairy Science·T DuffieldB McBride

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Citations

May 1, 2018·Journal of Animal Physiology and Animal Nutrition·M SariS F Anoosheh
Oct 15, 2013·Journal of Animal Physiology and Animal Nutrition·B StojanovicV Davidovic
Apr 21, 2019·Animals : an Open Access Journal From MDPI·Shengnan SunDuanqin Wu

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