Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    '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.

    We have a manual that explains all the features 

Record number 507630
Title The effect of grass yield on economic and environmental performance of dairy farms
Author(s) Klootwijk, C.W.; Middelaar, C.E. van; Pol, A. van den; Berentsen, P.B.M.; Boer, I.J.M. de
Source In: Book of Abstracts of the 67st Annual Meeting of the European Federation of Animal Science. - - p. 1029 - 1029.
Event 67st Annual Meeting of the European Federation of Animal Science, Belfast, 2016-08-29/2016-09-02
Department(s) Animal Production Systems
LR - Animal Nutrition
Business Economics
Publication type Abstract in scientific journal or proceedings
Publication year 2016
Abstract In this study we explored the importance of grass yield for the economic and environmental performance of
dairy farms that apply grazing. A whole-farm optimization model was used to analyse the effect of grass yield
on labour income, nitrogen (N) and phosphate (P2O5) losses and greenhouse gas emissions (summed in kg
CO2-equivalents per kg fat-and-protein-corrected milk (FPCM)). The model contains all relevant activities
and constraints present on Dutch dairy farms and represents a typical farm in 2016. The objective function of
the model maximizes labour income. The model was used to optimize farm management for a dairy farm of
50 ha with different grass yields. Data on grass yields were derived from 23-26 Dutch dairy farms that apply
grazing for the years 2012-2014. Grass yield varied between farms from 34.5 to 69 MJ NEL/ha (NEL = net
energy for lactation) at the same fertilization level of about 225 kg N/ha. The model results show that, based
on the lowest and highest grass yield, labour income varied from -€9,300 to €23,700 yr-1. A higher grass yield
led to a higher labour income mainly due to lower costs for feed purchases. A higher grass yield also resulted
in lower on-farm surpluses, i.e. 181 kg N/ha and 7 kg P2O5/ha (highest grass yield), compared to 245 kg N/
ha and 22 kg P2O5/ha (lowest grass yield), and lower greenhouse gas emissions, i.e. 970 kg CO2-eq/kg FPCM
(highest grass yield) compared to 1,047 kg CO2-eq/kg FPCM (lowest grass yield). Results show the importance
of grass yield to improve the economic and environmental performance of dairy farms. To identify options
to increase grass yields further research will focus on quantifying relations between grassland management
and grass growth, utilization and intake on modern dairy farms.
There are no comments yet. You can post the first one!
Post a comment
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.