I looked on the internet and found yeast can be used to simulate growth,
however im not sure what form the yeast must be--
http://www.feedfood.com/prod02.htm

Pub med produced many abstracts when I entered "yeast + gerbils" into
the search box--
http://www.ncbi.nlm.nih.gov:80/entrez/query.fcgi?cmd=Link&db=PubMed&dbFrom=PubMed&from_uid=4357841
You can locate the articles at the library.

--
Gary's web pages -
http://home.talkcity.com/StudioDr/go5

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