Date Full Report Received


Date Abstract Report Received



Institution: ,
Primary Investigator:
Co-Investigators: Jennie Popp

In 2011, the University of Arkansas was awarded a grant from the National Pork Board to facilitate the development of Version 2 of the Calculator which would include the development of an economic component and further improve its overall capabilities and scope. Specifically, the work promised consisted of three tasks:

Upgrade Version 1 with a translation of all code from MatLab to C# and improve the GHG emissions code to include a wider range of manure handling systems, feeds, temperature control strategies, barn constructions and other types of hardware and operational variations not covered in Version 1.

Create and add in the economic model to calculate the costs associated with activities that generate GHG and also asses the cost (or reduction in cost) associated with reducing the carbon footprint of swine production operations.

Improve the animal physiology model to better link animal feed, growth rates, and manure production/composition.
Version 2 of the calculator, (now titled the Pig Production Environmental Calculator) was delivered on time to the National Pork Board late May 2013. This version contained most of the specified upgrades including:

♦ Translation of the code from MatLab to C# for faster runtimes and better compatibility with a wide range of computers.
♦ Development of an improved Excel-based, user friendly interface that allows input scenarios to be saved and results to be printed.
♦ Development of a detailed user guide with step by step instructions for data input and explanations of all model output.
♦ Addition of water usage and GHG emissions from its acquisition and distribution, counties expanded to match the 2010 census, and addition of code for emissions due to
manure delivery and application.
♦ Improvements to the animal physiology model.
♦ Expansion of the available feeds for diet development to 162 ingredients
♦ Integration of an economic module that calculates costs associated with production
activities that generate greenhouse gas emissions
♦ Integration of a comparison module that calculates the changes in emissions and costs
that result when production activities are changed

We intended to include DNDC into Version 2 but the DNDC group was unable to provide working code in time for it to be added to the project. We instead utilized our own set of manure system Tier 2 models for subfloor, deep pit, lagoon and outside storage. Without DNDC we could not include emissions after field application, although we were able to calculate emissions from manure transport and land application. In the proposal we indicated that we would perform a substantial update to the animal physiology equations. Some of that was accomplished for Version 2 but the inclusion of NRC equations was not completed by the release date. However, the NRC equations have been successfully added to the model under this contract period and will be in Version 3.