The repellant is just meat meal or dried blood. That is a relatively cheap product to add ( don't believe the 'repellant is todear BS)One difficulty is that post BSE and CWD it is illegal to feed ruminant derived protein to ruminant livestock - meat meal was used in calf and stud stock rations in the past. I guess the fact that it is acting as a repellant in the pellets negates that compliance issue.
I would suggest that the deer are more conspicuous because they have come out of the blow fly riddled stench of the bush into the open post drop.
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