The chlorophacinone
Bromethalin acts by uncoupling oxidative phosphorylation in the brain. What that means in less scientific terms is that bromethalin makes it impossible to maintain aerobic metabolism in the brain. Oxygen cannot be used. Without the ability to use oxygen, the brain cannot make enough energy to fuel itself.
Brodifacoum - This is probably the 'strongest' poison you are likely to buy. It is a single feed bait, which means that the offending mouse or rat will consume a lethal dose at the first time of feeding. Its relatively fast acting with rats and mice dying within 3/4 days of consuming enough poison.
It is extremely toxic, and only a single dose of bromethalin is needed to cause death in rats and mice.
It is more toxic than warfarin to rats, mice, and dogs, but its palatability is somewhat lower. Diphacinone may not be effective against some warfarin-resistant rodents (Chalermchaikit et al., 1993). The anticoagulant rodenticides are marketed to have efficacy against a number of target pest species.
The chlorophacinone rodenticide bait resulted in 3 dead rats (50% mortality) and the bromethalin rodenticide bait resulted in only 1 dead rat (20% mortality; Table 1). Neither of the diphacinone baits were efficacious (<17% mortality) despite the animals having eaten the greatest amounts of these baits (Table 1).
This disturbance of clotting factors in the blood interferes with blood coagulation and leads to bleeding at capillaries, widespread internal hemorrhage, and death from excessive bleeding generally within 5 to 7 days.
Its LD50 is 2 mg/kg in mice, 5 mg/kg in rats, 13 mg/kg in rabbits, and 0.25 mg/kg in pigs. In field cases, most often poisoning occurs in pets, including dogs and cats. Signs of bromethalin appear within 10 h to several days after exposure and may last up to 12 days.
Q: Are there poisons (baits) available where rodents won't smell when they die? A: NO. Regardless of the bait used, a natural decomposition process always takes place with a distinctive odor.
Bromethalin is an acute, non-anticoagulant active that will begin to kill rats & mice in 2 or more days after consuming a lethal dose, faster than anticoagulant baits. Due to a quick knockdown when compared to anticoagulants, more rodents can be controlled with less bait.
Long-acting anticoagulants, bromethalin, cholecalciferol, and phosphides are the most common active ingredients in rat poison.
Tip 2: Bait Traps According to a Rat's Diet
Black rats, which scale trees and enter homes through coin-sized holes in attics, find peanut butter irresistible. Brown rats, which typically rummage through garbage and snake their way inside homes via tiny cracks, can be tempted with smelly cheese.
Mice that have taken poison return to their nest and die. This may cause a smell, however, this should go after a short while depending on how warm the nest is. Nests are difficult to locate so it is not recommended that you attempt to remove them. It is essential to repair mouse damage to prevent further infestations.
Zinc phosphide is the only one of this class incorporated into baits. It has been used as a rodenticide since 1930, and is now used more commonly in developing countries because it is economical and effective. Zinc phosphide baits generally contain 0.75–2.0% zinc phosphate.
While bromethalin sounds like the other two, it works in an entirely different way. Bromethalin is a neurotoxin that causes the brain to swell. Bromadiolone and brodifacoum have an antidote called Vitamin K. These two types of rat poison will interfere with the clotting of blood.
Some bromethalin products are used for mice and rats; others are formulated to kill moles (which are insectivores, not rodents). Bromethalin affects the nervous system and causes symptoms such as lack of coordination, tremors, seizures, and paralysis, and often death within 2 to 4 days.
A dead mouse repels other mice, which is why it's important to get rid of them immediately.
Poisoning is a common method used to control mouse populations. The impact of poison on mice can vary: Immediate Effects: Some poisons cause internal bleeding or organ failure, leading to intense pain. Mice may squeak during this period.
There is no antidote for bromethalin, so early decontamination is extremely important. If a dog ingests a toxic dose of bromethalin, promptly inducing vomiting can be lifesaving.
Diphacinone bait is dyed green in colour, and reduces the clotting power of blood. It is a 'first generation' anticoagulant poison, meaning the animal must feed on it multiple times before a lethal dose is reached.
Bromethalin is very toxic when swallowed and inhaled, and highly toxic when absorbed through skin. Irritation of eyes or skin is not expected due to dermal contact based on studies in rodents.
Using blood clotting response tests, resistance factors at the ED50 level in the homozygous resistant strain for the first‐generation anticoagulants warfarin, chlorophacinone, diphacinone and coumatetralyl were in the range 31.5 to 628.0 for males (M) and 21.6 to 628.0 for females (F), thus indicating that Y139C house ...
If the rodenticide keeps vanishing but your rodents are still there, you have a couple of possibilities: If you're not using bait stations, the rodents can drag away an enormous quantity of bait before they get around to eating any of it.
Peppermint oil is said to deter rats from entering treated areas. In high concentrations, peppermint oil may exhibit some repellency.