Proportions of potatoes and fodder beets selected by dairy cows and the effects of feed choice on nitrogen metabolism

Abstract

Twenty-three lactating dairy cows were switched from a standard diet to a ration of alfalfa/grass silage and 1 kg rapeseed cake supplemented with raw potatoes and fodder beets allowed on a semi-restricted basis. The effects of feed choice on urinary markers for nitrogen metabolism were evaluated by the Stepwise regression technique. Each kilogram dry matter of potatoes and fodder beets lowered milk urea concentration and also the urinary ratio urea/creatinine to a similar extent, but allantoin and fecal results suggested larger hindgut fermentation and hence lower ruminal microbial protein production with potatoes than with fodder beets. The variation for concentration of urinary constituents associated with animal, sampling day and sampling time suggests multiple sampling within a day as preferable for spot sampling. It is concluded that the reluctance to potatoes by some cows may cause initial difficulties when fed to high yielding cows naive to the feed. (C) 2009 Elsevier B.V. All rights reserved.

Keywords

Fodder beets; Potatoes; Dairy cow; Allantoin; Creatinine; Urea

Published in

Livestock Science
2009, volume: 126, number: 1-3, pages: 168-175
Publisher: Elsevier

SLU Authors

• Eriksson, Torsten

  • Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Animal and Dairy Science
Veterinary Science

Publication identifier

• DOI: https://doi.org/10.1016/j.livsci.2009.06.018

Permanent link to this page (URI)

https://res.slu.se/id/publ/27387