Attractant modest to non-existent

Bait poisons are usually composed with additives that other animals should discourage eating. They are thus made as safe as possible, so as not hungry squirrels, dogs, lizards, birds or other animals nibble. On the other hand, to attract a certain group of animals attractants.
This poison baits seem to be very safe, because attractants appear to have been used very sparingly. Perhaps it was too generous even with the bitter substances to deter animals? So far, after a week, none of 6 bait has been eroded in 3 cases. By contrast, of the same number of rats and mice bait Bayer no longer is left. This must, however, protect against squirrels and other animals.
Addendum: After 3 more weeks is still none of the 6 bait nibbled. The voles are present, proving that also placed in the traps "Rat and Mouse Bait" by Bayer, which are eaten each within two days. And every now and then is to find a "mouse's body," although (according to Bayer manufacturer) the animals are tired and looking to die a dark hole. (1500sqm garden with worse vole)