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This topic can be debated all day, there are two sides to every story. You call it nitpicking and that's fine I hold no grudges.
Arsenic added to chicken feed (roxarsone) is not added to control bugs. It is added as an attempt to control Coccidiosis, a subclass of microscopic, spore-forming, single-celled obligate parasite. They live and reproduce within the animals cells. So essentially our way of "Control" is to add a known poison and carcinogen to the animal, poisoning it as well as our food supply. Like the old adage says, "don't pee upstream from where you drink". Arsenic occurs naturally in our water and food supply. I am of the OPINION that we do not, and should not intentionally add more. Chicken is not the only source of intentionally added carcinogens, it is everywhere. Like I said, it is doubtful you will get hard numbers to play with since it is a variable across the board, however some stats from FDA, EPA and WHO are as fallows
-The FDA set levels for how much arsenic residue could remain in poultry in 1951. 2 parts per million (ppm) for liver and 0.5 ppm for muscle meat. These standards have not been revised since these levels were introduced. The average Americans annual chicken consumption has tripled from less than 20 Lbs in the 1940s to over 60 Lbs in 2008.
-The EPA reduced the maximum contaminant levels for arsenic in drinking water from 50 Parts per billion to 10 ppb in 2001. The cancer risk with this level of arsenic is still 50 times higher than allowed levels of other known carcinogens.
-Roxarsone-treated chicken has three to four times greater inorganic arsenic levels than in other types of poultry and meat from other animals, levels for heavy chicken eaters, would be greater than the tolerable daily intake recommended by the World Health Organization.
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Comparing "safe" levels of a poison for consumption to those that are specified for the amount found in the chicken is a moot point considering the chicken alone is not your sole source of intake of this toxin. It is a food "Chain" and as such all sources would need to be accounted for and the sum would then tell you how close to the dangers you are. This feed may be fed directly to the chickens but do not be fooled into thinking that is where it stops. Commercially speaking the arsenic fed chicken litter is used in other food production. Chicken litter is often added directly to beef cattle feed. It is used as a fertilizer in vegetable and fruit production. All these trace amounts crossing into other foods does have a cumulative effect on your body. Hence my opinion that arsenic and other known carcinogens have no place being intentionally added to the food chain when the sole purpose for its addition can be managed in a more natural method with good animal husbandry and best management practices. Ultimately, the reason it has not been changed as of yet is not a lack of severity in the problem behind carcinogen use, but a slow transition from the mindset of bigger, faster, more money to one that is more aware of public safety.
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Not entirely. The liver is in fact the cleansing organ that will contain the residue as the chickens body works to pull this and other toxins from the flesh and bloodstream to attempt to rid itself of the toxin. However, as the chicken eats the feed it will be digested and then it hits the bloodstream where it is pumped into all tissue and organs. The liver can only work so fast to rid itself of the toxins and if it is coming in everyday the chicken will never fully rid itself of the toxins.