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methane emissions intensity benefits from better
pasture
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About
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There are two
important measures relating to methane emissions from farmed animals. They
are gross emissions and emissions intensity, ie per kg
of carcase weight.
For many farming operations, particularly hill country, reducing the latter
is easier than reducing overall emissions without de-stocking.
Paradoxically however, the strategy to achieve this impacts negatively on
the former for a given area of land.
Methane is directly related to dry matter intake (consumption) {DMI}. For
NZ pasture fed cattle, the factor is 21.6gm per kgDM. It therefore follows
that the provision of higher nutritional value dry matter of would be
advantageous. This, coupled with a more intensive grazing management regime,
has the added benefit of promoting greater daily weight gain, itself of
benefit because it reduces the grazing days to a target liveweight. (A
significant part of the daily intake requirements is for
"maintenance".)
The paradox comes because these modern higher nutritional value grasses
grow significantly more dry matter per year than, for example, old rye grass
and browntop pastures.
The gold plated version of the strategy to reduce product intensity comes
at a high capital cost because it usually involves subdivision, ie fencing,
water reticulation and regrassing.
This App offers the ability for a user to analyse the benefits that can be
derived in the methane emissions space from better pastures and a more
intensive grazing regime.
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If you want to be
able to share scenarios, you can create a unique login to save your data. Tap
the Button below and when the App opens Bookmark (or save to Home screen) the
URL. You can share that login URL.
There is no limit to the number of logins you can create, its just a case
of keeping a record!
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Base Assumptions
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Version:
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1/09/2022
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CH4 / KgDM
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GWP
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kg CH4 per kg CO2
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Target kg (Lw or Cw)
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The section below
allows the user to test a range of weight and growth rate scenarios (eg Lw versus Cw, etc) before
populating the variables in the analyser model.
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Assume:
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Yield
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KgLwg
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Days
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KgLw
Start
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Lwg pd (max 2kg)
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End
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Days
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Tot MjME
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MjME pd
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KgDM pd
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Total Kg CH4
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Lwg/ha pa
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Kg CO2e
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Assume: Yield
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MjME
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/kgDM
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DMI pa/ha
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Assume: Yield
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MjME
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/kgDM
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DMI pa/ha
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Annual CH4/ha, (based on DMI) =
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These feed
requirements have been derived from interpolated Beef and Lamb NZ published
research data.
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© 2022 NZAgri.com - All rights reserved
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