- 108 ：名無しさん＠英語勉強中：2010/06/13(日) 16:10:55
The issue has kicked around since the first U.S. case of mad cow disease was discovered almost six years ago in an animal imported from Canada.
There have been two known indigenous cases of mad cow infections in domestic cattle since then, but both were in animals born before the enactment of stricter regulation of feed.
Generally, the FDA has left the decision on whether to feed cattle poultry litter up to state regulators.
California allows the practice with one exception: Poultry litter is banned in feed for lactating dairy cows.
In 2004, the FDA announced its intention to prohibit the use of poultry litter in cattle feed, but after reviewing the proposed ban decided against it.
The agency said its rules prohibiting the use of high-risk tissues in all animal feed were sufficient to keep mad cow pathogens from reaching poultry feed.
The FDA also said there was little risk to human or cattle health from the other components of poultry litter.
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