This week I really felt obligated to write this post. If you are like me, you want the very best for your chickens. We hate when our chickens are ailing or have something wrong, like a mite or lice infestation and always like to fix things asap. Like you, I certainly don’t like problems to linger or affect my flock or cause harm. However, sometimes in trying to do good and help our chickens, we can actually end up doing harm. Sometimes we can’t even see the harm that we are doing. Sometimes we can even be potentially harming ourselves without even realizing it. This is what is potentially happening in your flock when you use Frontline. Here’s why.
I have seen many chicken keepers on social media recommending the use of Frontline or other topical products that are used in cats and dogs to kill fleas and ticks. They work very well even on chickens. But in my opinion from what I have researched, it seems best to rely on other products that have been deemed safe in livestock use.
Before you read on, I guess I should pre-face this post by sharing that I am a nurse practitioner by profession. I will do my best to explain things in the simplest of ways, I cannot cover every minute detail, but I can share with you what is important. This goes for all chemicals and medications you use on your chickens, household pets and you. If you have questions, please post a comment on this post and I will do my very best to answer you.
What is Frontline?
Frontline is the brand name. The active ingredient or generic name of the chemical you are applying to your chickens is called Fipronil. Fipronil is sold under many brand names around the world. Fipronil is in a family of chemicals called phenylpyrozoles and is considered by the USDA to be a Class C chemical meaning that it could potentially cause cancer. It has been linked to thyroid tumors in rats. Fipronil works by targeting the central nervous system in insects.
What Happens When Frontline is Applied?
When Frontline is applied to the skin or taken orally, it is absorbed to some degree in the body, whether it be avian or mammals. Fipronil is absorbed in mostly in fatty tissues. Over time it is broken down into the blood stream. Studies have shown that significant amounts of finopril remains in the body’s tissues, especially in fat and fatty tissues. Scientists believe that the long half-life reflects the slow release of finopril residues (aka metabolites) and believe that there is a potential for bioaccumulation (build-up) of the metabolites of fipronil in the body over time. Experts believe that a single dose of fipronil can remain in a chicken’s body for up to 8 weeks.
Why do Half Lives Matter?
In medicine, one of the most important questions we ask ourselves will all chemicals and medications is what is the half-life? A half-life tells us how long it takes for our bodies to get rid of half of the dose given. For example, if the half life of a medication is 2 hours and you first took 10 mg, that means that in 2 hours from the time you took the medication, 5 mg will be left in your system, and 2 hours after that 2.5 mg will be in your system and so on until there is none left as long as you do not take another dose. We use this as a guide to help determine the dosing and how often medications should be taken to be safe. Some medications or chemicals have half-lives of a few hours while others can take days or even months. Depending on the dose, we know that fipronil has a first half life that can last up to 8 days. That is a long time. This means that to clear the body, once it is given it will probably take a couple of months for fipronil to be out of a system after the initial application.
As substances are broken down in our bodies, sometimes other substances are created from the breakdown. These area called metabolites. Fipronil has seven metabolites. One of those is a very toxic metabolite that is six time more potent than the original fipronil called fipronil-sulfone (aka Metabolite 46136).
What is LD50?
LD50 is available for all chemicals. Scientists determine at what dose does a certain chemical kill 50% of the subjects tested. It is always given in a mg/kg value.
Fipronil is highly toxic to bees, termites, rabbits, aquatic life, insects and “gallinaceous birds” (aka turkey, grouse, pheasants, quail and chickens). You can see some of the LD50s below:
- LD50 Oral (given by mouth) RATS 97 mg/kg
- LD50 Dermal (applied to skin): RATS greater than 2000 mg/kg
- LD50 Oral (given by mouth) DOG: 650mg/kg
- LD50 Oral (given by mouth) MICE 95 mg/kg
- LD50 Dermal (applied to skin): RABBITS 354mg/kg
- LD50 Oral (given by mouth): CHICKEN 11.3mg/kg (There are no dermal studies available most likely because the oral lethal dose was so low in chickens.)
It should be noted that animals can inadvertently ingest fipronil by the oral route via self-grooming.
But the biggest questions we also need to ask is what about sub-lethal doses. What the the effects of having finiopril in the body with doses lower than those required to cause death? What exactly does finiopril do long-term?
Where does fipronil end up in chickens?
We know that Fipronil ends up in eggs, meat and poultry fat. In one study, they discovered that chickens tend to store the fipronil in the peritoneal fat for up to 8 months! This is why the USDA has limits as to how much can be detected in the poultry products that feed the world. Even some limits have been set by the World Health Organization via CODEX.
- United States: Poultry Eggs: Max limit 0.03 PPM ( parts per million)
- European Union: Poultry Eggs: Max Limit 0.005 PPM (parts per million)
- United States Poultry Fat: Max Limit 0.05 PPM
- United States Poultry Meat: Max limit 0.01 PPM
Of note, a warning on the Frontline box state that this chemical is not to applied to dogs less than five kilograms. Chickens on average weigh between 2 and 3 kilograms. Furthermore, the estimated daily maximum intake for humans is between zero to 0.00003 mg/kg per bodyweight per day. One scientist relayed that you would only have a problem if you ate eggs contaminated with fipronil everyday.
How do I know how much fipronil is in one cc?
Approximately 98 mg is in 1 cc for the 9.8% concentration of fipronil. So for the dose .67cc tube is a little less than 67 mg.
Some chicken sites that recommend using the Frontline is at a concentration of 0.25cc (25 mg) for bantams and 0.40cc (40 mg) for standard sized chickens. It is unclear where they have obtained their dosing guidelines. Recommended dosing for dogs (not chickens) averages 6.6 mg/kg but it should be noted they have a higher LD50 than chickens.
My Final Thoughts about Frontline:
I wanted you to have this information to make to draw your own conclusions.
There is a reason why the World Health Organization/CODEX regularly tests food sources for contamination of fipronil around the world. In fact, just this month, Europe is recalling eggs tainted with fipronil. Sources believe that a poultry farmer in Europe used fipronil to treat poultry mites in his chickens’ housing. This is because they do not want this chemical in our food supply. Over 700,000 eggs and egg products in the UK alone have been recalled. The USDA even made a statement that none of the affected eggs were imported into the US and assured the American public that the egg supply in grocers is safe. You can read more about the eggs with fipronil in Europe here.
We know that even with a topical application, fipronil ends up in our chickens’ bodies including the eggs.
With other safe methods for treating poultry mites and lice,why take the risk?
Should you compromise your own health/safety/flock safety for ease of use of fipronil?
Just because it works to control mites and lice, does not mean it is safe.
Just because you can’t see bad things happening to your birds after you apply this it does not mean things are not happening inside that you cannot see.
Personally, I don’t want to eat eggs or feed them to my kids if they have fipronil in them.
You probably should not sell your eggs if you treat with fipronil.
Do your own homework. I’m not entirely sure why veterinarians would recommend this given the readily available data available to them.
Lastly, there is no egg withdrawal period because it is not safe to use in meat and birds that produce eggs. The affected birds in Europe are being culled. Their eggs destroyed along with their bodies. They will not be made available for consumption to people or other animals.
For more information about treating mites with both natural and chemical applications please check out my post on chicken mites.
available as of 8.22.17 for your review: