Im pretty sure tomcat brand uses bromethalin as the active ingredient. This is a single feeding, or single dose type poison and not an anti-coagulant. I'm not sure if rodents can build immunity on single dose killing poisons, but I'm not an expert. It's never a bad idea to change products though, not just changing brands but making sure you are using something with different active ingredients.
One thing about putting bait/poison out. You should try to eliminate all other food sources if possible. If rodents have plenty of other food sources, they might not target the bait, or consume a lethal dose. I also tie a string to the blocks or nail the blocks to a board, that way they are forced to eat and not carry it off. One bait block can kill several mice, or a couple rats but if one carries it off, it might only kill that one.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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