Advanced Search
MyIDEAS: Login to save this paper or follow this series

Land-Use Credits to Corn Ethanol: Accounting for Distillers Dried Grains with Solubles as a Feed Substitute in Swine Rations


Author Info

  • Jacinto F. Fabiosa
Registered author(s):


    Many studies on the impact of biofuels on greenhouse gas emissions do not consider indirect land-use change and land use avoided because of co-products utilization. This paper provides estimates of the land-use credit for corn ethanol when its by-product—distillers dried grains with solubles (DDGS)—is used in swine feed rations to substitute for corn and soymeal. The range of estimates used here covers the land-use credit used in the literature. Moreover, this study departs from earlier studies because feed rations from a least-cost optimization are used rather than rations from feeding trials, and DDGS nutrient profile variability is fully accounted for. As a result, displacement rates and the land-use credit can be better characterized using a distribution rather than a single point estimate. The land-use credit for corn ethanol for DDGS used in swine feed rations ranges from -0.367 to -0.596 hectares, whereby substitution for corn in the feed ration accounts for 56.09% and soymeal substitution contributes 48.46%. Variability of the land-use credit is contributed more by the variability of land use from the substitution of soymeal than that of corn. Finally, when feed compounders discount the DDGS nutrient profile to ensure they are at or above any realized nutrient profile 90% of the time, the land-use credit for corn ethanol declines by 8.47% for DDGS in a swine feed ration.

    Download Info

    If you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.
    File URL:
    File Function: Full Text
    Download Restriction: no

    File URL:
    File Function: Online Synopsis
    Download Restriction: no

    Bibliographic Info

    Paper provided by Center for Agricultural and Rural Development (CARD) at Iowa State University in its series Center for Agricultural and Rural Development (CARD) Publications with number 09-wp489.

    as in new window
    Date of creation: Apr 2009
    Date of revision:
    Handle: RePEc:ias:cpaper:09-wp489

    Contact details of provider:
    Postal: 578 Heady Hall, Ames, Iowa 50011-1070
    Phone: (515) 294-1183
    Fax: (515) 294-6336
    Web page:
    More information through EDIRC

    Related research

    Keywords: biofuel; DDGS quality; displacement rate; greenhouse gas accounting; land-use credit; optimal; stochastic LP; swine grower-finisher optimal feed ration.;

    This paper has been announced in the following NEP Reports:


    No references listed on IDEAS
    You can help add them by filling out this form.



    This item is not listed on Wikipedia, on a reading list or among the top items on IDEAS.


    Access and download statistics


    When requesting a correction, please mention this item's handle: RePEc:ias:cpaper:09-wp489. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: ().

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If references are entirely missing, you can add them using this form.

    If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.