Which rodenticide type requires fewer feedings for a lethal dose?

Second-generation anticoagulants are more potent and require fewer feedings to achieve a lethal dose compared to first-generation anticoagulants. This is largely due to their chemical structure and the way they operate in the rodent's body. Second-generation anticoagulants can be effective with just one or two feedings because they have a higher level of toxicity and a longer duration of action.

First-generation anticoagulants require multiple feedings over several days to gradually affect the rodent's ability to clot blood, leading to death, while non-anticoagulant rodenticides may work through different mechanisms, often necessitating fewer but highly toxic doses. Compressed grain pellets, regardless of the active ingredient, are merely a method of formulation and do not inherently relate to the efficacy or feeding frequency related to lethality.

Thus, the second-generation anticoagulants are designed to ensure quicker and more effective control of rodent populations, which is why they require fewer feedings to achieve mortality.