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Vasse field day methane sept 2010 jones






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Vasse field day methane sept 2010 jones Vasse field day methane sept 2010 jones Presentation Transcript

  • The NFI trait & methane emissions Fiona Jones Beef Development Officer September 2010
  • Overview
    • General outline of methane emissions
    • Net Feed Intake trial – testing emissions in field
    • Conclusions
  • Production of methane Digestion in rumen Hydrogen Methanogens Methane
  • 555.3 million tonnes CO 2 equivalent Source AGO 2007 National inventory
  • Emissions in agriculture
  • What is linked with methane production?
    • Approximately 8-10% of energy is lost to methane production
    • Methane production is linked to higher fibre content pastures
      • Pastures kept at higher digestibility have lower methane production
      • Higher intake is linked to higher methane production on pastures
    • Highly fermentable diets i.e. grain have lower methane production
  • Perspective - methane production Eckard, 2007 450-800 32-57 50-90 Beef steer Pot. km driven by 6 cylinder LPG car Eq. grazing days lost/animal Methane (kg/year) Animal Class
  • Is it really a focus just on emissions?
    • There is no silver bullet to reduce methane production but we can still work at it!
        • Look at optimising year round pasture quality
        • Grazing management practices
        • Genetic selection for low emitting cattle???
        • Continue good management practices as we identify solutions e.g. genetics
  • The Net Feed Intake trait Does it impact on methane emissions?
  • Trangie Angus NFI Lines divergence -1.5 -1 -0.5 0 0.5 1 1.5 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 NFI (kg/day) High NFI Low NFI
  • Based on EBV’s the two groups
    • Expect a variation in feed intake of 1.37 kg/day between the groups
    • Cows pregnant on low quality pasture
    • Cows with calves at foot on high quality pastures
  • What is OP-FTIR?
  • Wind
  • Feb 2009 – 55% DMD pastures
    • While pregnant with low efficiency (HNFI) cows having an
    • Estimate intake of 10.7kg DM/500kg LW/day and methane emissions of 129.3 ± 33g/ 500kg LW.
    • While the high efficiency (low NFI) cows were 10.2kg DM/500kg LW/day with group methane emissions of 130 ±24g/ 500kg LW .
    • Grazfeed estimates – 157g (8.1MJ energy lost)
  • August 2009 – 81% DMD pastures
    • LE cows and calf intake is 14.0kg DM/day and 190 ± 31g methane/ 500kg cow and calf LW and intake of and
    • HE cows and calves is 13.1 kg DM/day and 170 ± 35g methane /500kg cow and calf LW.
    • Grazfeed estimates 229g (12.7 MJ energy lost/day)
  • Conclusions Net Feed Intake Trial
    • Methane emissions based on the extreme in the NFI trait - no significant differences in emissions
    • Individual animals may have lower or higher emissions within the group.
    • Actual emission rates appear lower than expected
    • We have control over our normal management practices, which we can use to reduce emissions.
    • These go hand in hand with production efficiency in your grazing enterprise.
  • Acknowledgements
    • Cattle Industry Compensation Act for funding
    • DAFWA for support and funding
    • University of Wollongong
    • Nola Mercer and Neroli Smith for technical support
  • Questions?