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Varying dietary fiber for lactating cows fed corn and barley silages



Varying dietary fiber for lactating cows fed corn and barley silages



Journal of Dairy Science 57(12): 1474-1482



75 Holstein-Friesian cows were in 3 experiments to determine the effect of dietary fibre content on ration intake, milk and milk fat yield, ration digestibility, N utilization and ruminal volatile fatty acids. With maize or barley silage as the source of forage, 4 treatment groups consumed rations averaging 11.8, 14.5, 17.5 and 20.6% crude fibre and 14.3, 17.5, 20.0 and 23.9% acid detergent fibre (DM basis). Fibre intake was controlled by the amount and fibre content of concentrate offered or by silages with different grain content. With maize silage, DM intake was not altered by dietary fibre, but DM intake was lower when additional fibre was fed with barley silage. Linear regressions best described effects of dietary fibre on milk yield and milk fat content. Milk yield declined 0.39 and 0.36 kg and milk fat content increased 0.072 and 0.067% for each percentage increase in crude and acid detergent fibre. Ration digestibility, determined by lignin ratio, was less for barley silage than maize silage. Narrowing acetate:propionate ratios were evident when dietary fibre was lowered. From these experiments with silage based rations, either crude or acid-detergent fibre content of forage adequately describes feeds to serve as a basis for practically balancing rations for lactating cows.

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Accession: 000260750

Download citation: RISBibTeXText

PMID: 4443462

DOI: 10.3168/jds.s0022-0302(74)85091-5


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