1. Are rendering plants allowed to use roadkill, pets, etc. in MBM intended for feed-grade MBM?
2. If they're allowed, do they actually do it?
My google-fu has failed to unearth a USDA regulation saying what may or may not be in MBM, but I did find this:
Material from cattle, swine, and poultry made up the
majority of the raw material processed by the renderers
surveyed (fig. 2). Most MBM submitted contained material
from more than one species, three of the submitted samples
were all pork material, three were all cattle, and one was 99%
chicken. A minority of renderers reported using any material
from cervids, horses or aquatic animals; none of these species
made up greater than 10% of an individual renderers raw
material. No renderers reported including any sheep, dog,
cat, or other companion, fur or zoo animals. The absence of
canine or feline material is consistent with an FDA report,
which examined a range of commercial dog food, many
varieties of which contained MBM. Using a very sensitive
method to identify the species of the material, they did not
detect any feline, canine or equine tissue (Myers et al., 2004).
Ten out of 19 renderers used as least some material
from dead stock (animals that died before slaughter); 5 of 19
renderers had dead stock as at least 10% of their raw material.
None of the renderers reported using any dead stock from
non-agricultural sources such as road kill, wildlife culling,
racing animals, zoos, or veterinarians. Eight out of 19 renderers
had some material that consisted of meat products past
their sell by date; 5 out of 19 renderers had this type of
material as at least 10% of their raw material.