If that is the case what in your opinion are are modern day derivatives?

Also Ive also found these websites which might be helpful to people: The Truth About Dog And Cat Food and UK Dog Foods - Understanding labelling practices - meat & animal derivatives, cereals, EC permitted additives

Heres a brief one on animal derivatives: http://www.best-dog-food-review.com/67901/67927.html

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Love and adore your pets everyday like its their last.