Hi, this is an article that I found, one of firsts that came up by googling: Composting rapidly reduces levels of extractable oxytetracycline in manure from therapeutically treated beef calves http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V24-4HVDYM4-4&_user=2502780&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000057629&_version=1&_urlVersion=0&_userid=2502780&md5=6bbdafe9dbea7a71cf23b5043228da94
I am not sure I understand how they were "composting". According to the abstract, the manure "were mixed with straw and woodchips, and aliquots of the subsequent mixtures were treated in laboratory composters for 35 days. In addition, aliquots of the OTC-containing mixture were incubated at 25 °C or sterilized followed by incubation at 25 °C." What I understood from the abstract (not the article of course, which I am interested in reading) is that at the end, they were not sure whether OTC had entirely disappeared, but from the level of bacteria (sensitive and resistant to OTC) that OTC was supposed to kill, they thought that OTC might be rendered biological inactive. This I take is their indirect evidence that the manure may be safe to use since OTC had lost its effectiveness in killing the bacteria, since they found a 30 fold (?) increase of OTC sensitive bacteria and a drop in OTC resistant bacteria. Does this seem to make sense? Of course, this occurred in the laboratory. I think that it would be too much efforts to try their way of composting. I don't know the normal level of antibiotics or OTC being used in livestock. So I guess if resources are limited, and we have to use the medicated manure, then may be this will work? Can this laboratory condition be replicated in nature? How much manure used in organic gardens is medicated? ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Kindness in words creates confidence. Kindness in thinking creates profoundness. Kindness in giving creates love. - Lao Tzu “Courage is what it takes to stand up and speak; courage is also what it takes to sit down and listen.” - Winston Churchill ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ --- On Wed, 2/18/09, Winnemucca Community Garden <[email protected]> wrote: From: Winnemucca Community Garden <[email protected]> Subject: [Community_garden] Medicated Manure To: [email protected] Date: Wednesday, February 18, 2009, 2:20 PM Hey everybody, Manure from horses, cows and other rhuemanids are a valuable resource to gardening, especially an organic garden. However one concern with using this manure is the antibiotic/steroid residues that get passed through such animals, and end up fertilizing our vegitation. Does anyone know of any methods that can 'purify' medicated manure , or any research that they can refer me to? I've tried looking at some scientific journals but the terminology is a bit heavy. Can someone put the stuff in laymens terms? Peace, Love and Justice Jordon H. Winnemucca Community Garden 151 W. McArthur Ave. Winnemucca, NV 89445 775.623.2333 http://winngarden.org --- On Wed, 2/18/09, [email protected] <[email protected]> wrote: From: [email protected] <[email protected]> Subject: Community_garden Digest, Vol 667, Issue 4 To: [email protected] Date: Wednesday, February 18, 2009, 9:03 AM Send Community_garden mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://list.communitygarden.org/mailman/listinfo/community_garden_list.communitygarden.org or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Community_garden digest..." Today's Topics: 1. 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