Jim Riddle, University of Minnesota
Organic livestock operations must manage manure in a manner that does not contribute to contamination of crops, soil, or water by plant nutrients, heavy metals, or pathogenic organisms, and which optimizes the recycling of nutrients. If manure is brought onto the farm from a non-organic source, it cannot have had non-approved synthetic additives added to the manure pits or piles. The non-organic animals could have been fed or bedded with non-organic crops, however.
- United States Department of Agriculture. 2000. National organic program: Final rule. Codified at 7 C.F.R., part 205. (Available online at: http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&sid=3f34f4c22f9aa8e6d9864cc2683cea02&tpl=/ecfrbrowse/Title07/7cfr205_main_02.tpl) (verified 8 Dec 2015).