By Stephen Wiedemann, Eugene McGahan, Shelly Grist, Tim Grant
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Additional info for Environmental Assessment of Two Pork Supply Chains using Life Cycle Assessment
Sample text
Emissions were estimated using Simapro, published data and calculations based on the farm mass balance and application of the DCC (2007a) methodology (enteric methane). Based on the feed intakes and text values of individual feed dry matter digestibility, dry matter and ash content, the amount total solids (TS), volatile solids (VS) and ash excreted from the pigs in the northern supply chain was calculated. This is an important mid step in the calculation of a volatile solids production and hence predicted methane emissions.
In some cases two commodities were balanced to provide a similar energy and protein profile. Further explanation of the simplified diet and substitution ratios used for by-products is presented in the section on upstream processes. Table 12 and Table 13 show the simplified rations for the breeder and grower / finisher units in the northern supply chain. Table 12 – Simplified commodity inputs for production of one tonne of breeder unit ration for the northern supply chain Inputs Materials Type Description Barley 12% Maize 8% Sorghum 10% Wheat 12% Soybean meal (45%) Tallow Bentonite Limestone Lysine - HCL Methionine Threonine Other feed additives Sorghum + sorghum equiv.
These data were collated to generate simplified input data for the breeder and grower / finisher unit (Table 15 and Table 16). These include diesel used to transport the feed to the piggery. Water is used at the feed mills to produce pelletised feed (steam generation), with no water reported for mashed feed. Feed mill #1 reported 10 litres of water per tonne of feed produced and feedmill #2 reports 132 litres of water per tonne of feed produced. It was assumed this water was drawn from reticulated supply.