preliminary results of estimating on-farm methane - malcolm mcphee
TRANSCRIPT
Preliminary estimates of on-farm methane emissions for sheep production on the Northern
Tablelands of Australia Estimating on-farm sheep methane emissions
Preliminary results of estimating on-farm methane emissions for sheep production on the Northern Tablelands of Australia– Dr Malcolm McPhee – Animal Production – 15 th February 2011
Outline
Background Sheep production on the Northern Tablelands
– Objectives– On-farm data collection– Methane estimates and analyses– Sheep production data
Preliminary results
UWA: Ridgefield, Pingelly, WA
CSIRO: Lansdown, Qld
DPI Victoria: DPI Hamilton/ Demo dairy Terang, Victoria
UNE: Trevenna, Armidale, NSW
“Reducing Livestock Emissions Program” to demonstrate potential mitigation strategies for enteric emissions.
UWA: Ridgefield, Pingelly, WA
CSIRO: Lansdown, Qld
DPI Victoria: DPI Hamilton/ Demo dairy Terang, Victoria
UNE: Trevenna, Armidale, NSW
Main Project Objectives at the Trevenna site
Demonstrate– differences in methane (CH4) production from
sheep grazing on different landscapes: • low fertility (hills @ 3.7 DSE/ha)
versus• high fertility (flats @ 6.7 DSE/ha)
– techniques for• estimating CH4 (e.g. GrazFeed) and• measuring CH4 (e.g. FTIR)
The Site - 36 ha at “Trevenna” UNE, Armidale
Hills
2 landscapes (hills and flats)
3 classes (A,B,C)
3 paddocks (1,2,3)/class
Flats
Flats
On-farm data collection
Soil samples Pasture collection (monthly)
– Green– Dead– Digestibility
Animal (monthly)– Live weights– Condition scores
Wool (yearly)– Staple and tensile strength and fibre diameter
On-farm data collection (continued)
GPS satellite data– ‘Crop Circle’ scanning equipment– GPS tracking devices
On-farm energy use e.g. fertilizer; supplementary feeding
Nitrous oxide (N2O)
H2O balance
Methane estimates and analyses
Methane estimates– GrazFeedTM
– AusFarmTM
– SGS
Methane analyses– Life cycle analysis– Economic analysis
Sheep Production
144 Merino ewes group mated with Border Leicester rams
6 flocks (3 on the hills and 3 on the flats)
–3.7 DSE/ha on hills
–6.7 DSE/ha on flats
– lambing in September.
Heading
Crop Scanner Index
Gre
en B
iom
ass
(kg
DM
/ha)
Crop Circle Relationship Between Green Biomass and Crop Scanner Index
Y=15.1exp6.8x
R2=0.63
Flats
Flats
Hills
(kg DM/ha)
Index map: Green Pasture Available (kg DM/ha)
Intensity of grazing from 8th Sept to 18th October
(kg DM/ha)
Green (t DM/ha)
Dead (t DM/ha)
DMI (kg)
Lambs
Ewes Lambs LWG (g/day)
CH4(g)/ day
CH4(g)/ kg LWG
Hills 0.5 5.60 1.90 0.34 223 43 190 Flats 2.1 0.06 2.20 0.29 305 45 150
Methane (CH4) produced (g)/kg live weight gain (LWG) on the hills and flats based on pasture available
(GrazFeedTM Inputs and Outputs)
From crop scanning and pasture assessment data
Green (t DM/ha)
Dead (t DM/ha)
DMI (kg)
Lambs
Ewes Lambs LWG (g/day)
CH4(g)/ day
CH4(g)/ kg LWG
Hills 0.5 5.60 1.90 0.34 223 43 190 Flats 2.1 0.06 2.20 0.29 305 45 150
From crop scanning and pasture assessment data
Methane (CH4) produced (g)/kg live weight gain (LWG) on the hills and flats based on pasture available
(GrazFeedTM Inputs and Outputs)
Conclusions
On a sustainably stocked production system
–the flats produced lower methane emissions per kg LWG
Trevenna a demonstration site for farmer delivery
–estimating CH4 (e.g. GrazFeed) and
–demonstrating how to increase economic viability consistent with delivering lower emissions intensity
Acknowledgements Advisory Team Members
– Clare Edwards Agronomist. I & I NSW– Jim Meckiff Livestock Officer. I & I NSW– Chris Shands Livestock Officer. I & I NSW
UNE Farm Management– Neil Baillie Senior Technical Officer. UNE– Paul Arnott Farm Manager. UNE
Crop circle scanner– Derek Schneider. UNE
Research Team Members– Roger Hegarty. UNE– Darryl Savage. UNE– Annette Cowie. PIIC – UNE & I & I NSW– Chris Guppy. UNE– David Lamb. UNE
Producer Advisory Group