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Anticoagulant rodenticides are a frequently used rodenticide that are categorized as first-generation or second-generation. First-generation anticoagulents include warfarin and indanediones such as chlorophacinone and diphacinone. Due to an increase in rodent resistance to first-generation chemical compounds, second-generation compounds were developed that were designed to kill rodents quicker and after one feeding, as opposed to the first-generation compounds which usually require multiple feedings to induce poisoning, with concentrations ranging from 0.025 to 0.005%. Second-generation anticoagulents include brodifacoum, bromadiolone, difenacoum, and difethialone. Today, second-generation anticoagulents are more commonly used than first-generation compounds. Anticoagulents are often produced as wax blocks, tracking powders, and pellets.
The problem with rodenticides is that they have the same effect when eaten by any animal, including chickens. Upon ingestion, anticoagulants inhibit epoxide reductase which reduces the ability for the chicken to regenerate vitamin K. As the remaining vitamin K depletes, it will lead to inhibition of coagulation synthesis. Depending on the amount of poison ingested, there will be a delayed onset of clinical signs of toxicity. Clinical signs will generally take a couple days to develop after exposure to a toxic amount of anticoagulants and are often non-specific such as loss of appetite, weakness, and depression.