Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 536197
Title Nitrogen use efficiency of sixty individual dairy cows under intensive grazing
Author(s) Klootwijk, C.W.; Zom, R.L.G.; Pol, A. van den; Middelaar, C.E. van; Holshof, G.; Boer, I.J.M. de
Event WIAS Science Day 2018, Wageningen, 2018-02-05/2018-02-05
Department(s) Animal Production Systems
LR - Animal Nutrition
Publication type Poster (scientific)
Publication year 2018
Abstract The Dutch dairy sector aims to improve nitrogen (N) use efficiency (NUEN) at intensive dairy farms, while supporting grazing. Managing NUEN in intensive grazing systems is challenging, because of the high feed supplementation levels combined with varying and unknown grass (N) intake at cow level. To gain insight in the NUEN at intensive dairy farms, we need insight in the NUEN at cow level. We performed a two-by-two factorial grazing trial with sixty Holstein Friesian cows (7.5 cows ha-1), in which we compared NUEN of individual cows under two grazing systems, i.e. compartmented continuous grazing (CCG) and strip grazing (SG), and two levels of dietary rumen-degradable protein balance (OEB), i.e. low and high (contrast of 500 g OEB cow-1 day-1). Grass and supplementary intakes, and faecal and milk outputs were quantified and analysed for N content, during two weeks in July and September 2016. Results showed a higher NUEN for cows in CCG (39%) compared to cows in SG (36%) in July, due to a lower grass (N) intake in CCG. Low OEB showed a higher NUEN (40%) compared to high OEB (34%). Our results are key to explore strategies to improve NUEN at farms that apply innovative grazing systems.
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