Effect of raw potatoes on voluntary roughage intake, milk production and composition in dairy cows

Brabander, D.L. de; Andries, J.I.; Aerts, J.V.; Buysse, F.X.

Revue de l' Agriculture 35(6): 3269-3281

1982


ISSN/ISBN: 0776-2143
Accession: 001069050

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Abstract
In trials in 1976, 1978 and 1979 with 36 Blanc-Rouge de Belgique, Holstein X Friesan and Pie-Noire dairy cattle, daily rations of 10 or 20 kg raw potatoes fed in addition to wilted perennial ryegrass silage fed ad lib. increased total roughage intake by 0.9 and 1.8 kg DM. Addition of 20 kg of potatoes to a hay ration increased roughage intake by 3.3 and 2.1 kg DM in 2 separate trials. Daily milk production was not significantly affected although butterfat was increased by up to 0.22% in 2 trials and protein content was increased by 0.06-0.16%. There were no deleterious effects on health. An economic evaluation of potatoes as a supplementary feed is presented.