Where Did Rat Poison Come From
Below is a MRR and PLR article in category Home Family -> subcategory Home Improvement.
The Origin of Rat Poison
Summary
Rats and other vermin are hard to eliminate with poisons due to their cautious eating habits. They sample a bit of food and wait to see if it makes them sick. Effective rat poison must be tasteless, odorless, and work with a delayed effect.
Types of Rodenticides
There are various rodenticides available, with anticoagulant rodenticides being the traditional choice. These are preferable because they have a readily available antidote. In contrast, other types are more toxic and lack an antidote.
Discovery of Rat Poison
In 1921, ranchers were puzzled by their livestock bleeding to death from minor cuts. Even small scratches from their roughage were fatal due to internal hemorrhaging. This occurred despite the hay appearing similar to previous years.
Karl Paul Link, a researcher with the Wisconsin Alumni Research Foundation (WARF), studied the ensilage from affected and unaffected ranches. He found that dicoumarin, a potent anticoagulant formed when sweetclover hay is exposed to heat and mold, caused the problem. This year had been especially warm, facilitating the formation of dicoumarin.
Evolution into Rat Poisons
Modern rat poisons are derived from this chemical. They are lethal enough to eliminate an entire rat colony. Single-feed baits, potent enough to kill with one dose, also originated from these discoveries.
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