Environmental Health Perspectives, a publication of the NIEHS - a branch of the National Institutes of Health has an article that examines the feed ingredients for our meat supply. If you can get to the full text, you will see a table that lists pharmaceutical waste, plastics and industrial wastes as ingredients.
Click on the word "FULL" in the upper right box of the article.
If you are required to sign up - I hope you do. It will give you access to this publication which is eye opening about the research into environmental exposures that we all experience.
The research rarely has an effect on policy so it is up to each of us to become educated if we want to protect our health and that of children.
Animal Feed Ingredients and Feeding Practices
Animal feed ingredients that constitute complete feed products are derived from a multitude of raw materials of plant and animal origin, as well as pharmaceutical and industrial sources. Specific feed ingredients vary depending upon the animal (i.e., poultry, swine, cattle); Table 1 provides an overview of feed ingredients that are legally permitted and used in U.S. animal feed. More specific information about feed ingredients listed in Table 1 is available in the Official Publication of the Association of American Feed Control Officials, Inc. (AAFCO), which is published annually (AAFCO 2004), and in Lefferts et al. (2006). In the present review we focus on feed ingredients listed in Table 1 that raise specific concerns for public health, including rendered animal products, animal waste, plant- and animal-based fats, antibiotics, and metals.
http://www.ehponline.org/docs/2007/9760/abstract.html
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