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Abstract

The aim of this study, which was part of the EU-financed project Life-Ammonia, was to evaluate the effects of decreased dietary crude-protein concentrations on intake, milk production and nitrogen efficiency of dairy cows. Crude-protein concentration of the diet, containing mainly grass-clover silage and concentrate, was decreased from 170 g/kg DM in the reference year to 160 g/kg DM during the first two experimental years. Dietary crude-protein concentration was 170 g/kg DM during the third experimental year. Averaged across the three experimental years, daily DM intake and energy-corrected milk yield increased by 1.9 and 2.4 kg per cow, respectively, compared to the reference year. This resulted in only minor changes in nitrogen efficiency of lactating cows among years. Thus, a crude-protein concentration of 160-170 g/kg of dietary DM has the potential to increase milk yield and to control nitrogen losses from the manure

Keywords

crude protein; feed intake; milk yield; nitrogen efficiency; urea

Published in

Skjervold symposium series
2003, volume: 3, pages: 129-131
Publisher: Agricultural University of Norway, Department of Animal and Aquacultural Sciences, Ås, Norway

Conference

Early harvested forage in milk and meat production

SLU Authors

UKÄ Subject classification

Food Science
Environmental Sciences and Nature Conservation

Publication identifier

  • ISBN: 82-7479-016-2

Permanent link to this page (URI)

https://res.slu.se/id/publ/1030