Gaseous emissions from deep litter systems for dairy cows Gert-Jan Monteny Presentation for UNECE meeting Prague, April 2006.

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Presentation transcript:

Gaseous emissions from deep litter systems for dairy cows Gert-Jan Monteny Presentation for UNECE meeting Prague, April 2006

Deep litter systems for dairy cows Work in the 90’s by Groenestein et al.: Mechanically ventilated dairy cow house (loose house) 7 – 10 kg straw per animal and day Ammonia emission: 6.8 kg per cow (6,000 l) No N 2 O detected CH 4 : 1 kg per cow and day At that time, little attention paid to this type of cattle housing (mostly: loose housing with cubicles; tying stalls to some extent Nowadays: increased attention (animal welfare, biological farming), including gaseous emissions from storage

Tying stalls (‘the old days’)

An overview of a loose house cubicle stall

What do deep litter systems look like ?

Current project Naturally ventilated dairy cow house Biological farm Measurements from November 2003 – September 2004 (periodical monitoring) Ammonia, Methane, Nitrous Oxide and odour from the animal house, and from outdoor stored FYM

Emission measurements Animal house: Internal tracer gas ratio method (SF 6 ) to measure ventilation rate Sampling of indoor air using a circular sampling line NH 3 concentration with convertor + NO x analyser (continuous) CH 4 and N 2 O concentrations with GC (collected samples)

Emission measurements (cont’d) FYM storage outdoor (heap ) External tracer gas method: SF 6 released at the heap Concentrations of SF 6 and other gases measured downwind (profile) Using wind speed profile and dispersion model to assess fluxes

Results (cow house) Housing seasonGrazing season Nov 03Jan 04May 03Sep 04 Days65144 Cows Temp Vent m 3 /h NH 3 g/d CH 4 g/d , N 2 O g/d

Findings (cow house) Annual NH 3 emission: 13.9 kg/LU (assuming 175 days grazing) Dutch EF for cubicle houses: 9.5 kg/cow (= LU) Highest emissions during period with grazing; explained from T and N-concentrations, but … CH 4 : kg/d.LU; traditional slurry: 0.5 kg/d N 2 O: g/d.LU; traditional slurry: approx. 0

Findings (FYM storage) Significant NH 3 emissions directly upon storage Hardly any emission found after 2 weeks 7.9 kg/LU for this period of FYM Or…110 kg TAN emitted from the FYM heap 425 m 3 * 0.6 kg/m 3 * 1.3 g/kg = 350 kg TAN stored Emission factor = 30% Significant CH 4 emissions after 2 weeks No N 2 O found

Finally….. THANKS