Flubendazole, is a broad-spectrum anthelmintic that will kill all gastrointestinal worm species that commonly occur in poultry. It is effective against roundworms (Ascaridia galli, Heterakis gallinarum, Capillaria spp., Amidostomum anseris and Trichostrongylus tenuis), gapeworms (Syngamus trachea) and tapeworms (Raillietina sp.).
It is licensed for use in poultry in the European Union.
There is no egg consumption withdrawal period at the prescribed dose 30grams per ton of feed given over a 7 day period.
It is recommended to wait three to days post treatment for slaughter for meat.
Flubendazole is the active ingredient in a number of propriety wormers.
Some of the mosr common are
Flubendazole is most easily found by searching for pig, or poultry wormer.
Products containing Flubendazole are often sold as powders and dosage recommendations are per tonne of feed.
The most commonly recommend method of administering the product is to add an oil such as olive oil or sunflower oil to the feed and then thoroughly mix in the powder so it stick to the feed.
Small premixed packs can be purchased.
The above method is often not convenient for the backyard, or small flock poultry keeper who may want to dose individually.
Further complications are that bulk packs come in varying strengths of the active ingredient Flubendazole. I have found products comprising 1%, 2.5%, 5% and 6% of the active ingredient Flubendazole.
Fortunately Flunendazole has a high dose variation tolerance. The manufacturers of Flubendazole give a factor of safety of 10X the recommended dose before any contraindications are evident.
It is this factor of safety that makes Flubendazole suitable as a feed mixed form of combating worms as there is no way of regulating exactly how much feed a particular fowl will consume at any one time.
The signs of a sever overdose are vomiting and diarrhoea. Once the fowl has excreted the drug studies have shown no lasting ill effects.
The dosage per fowl works out to be fractions of a gram. Most digital kitchen scales will with some care measure 1 gram of a powder with reasonable accuracy.
Measure 1 gramme of the powder and tip it on to a clean sheet of A4 paper.
Divide the pile of powder in half, judging by eye the equality of both halves.
Replace one pile in the product container leaving a pile of approximately 0.5 of a gram.
Now divide this pile into five equal amounts by eye. Each pile will roughly be 0.1 gram (one tenth of a gram).
Reading the instruction sheet at the bottom of the page indicates that for 2kg of feed 6 grams of Flubendazole should be added.
For 1kg of feed this should be 3 grams.
For 0.5kg (500 grams) of feed this should be 1.5 grams
For 0.25kg (250 grams) of feed this should be 0.75 grams
For 125 grams of feed this should be 0.375 grams
For 62.5 grams of feed this should be 0.187 grams.
The average bantam hen fed solely on commercially produced feed consumes between 50 (2 ounces) grams and 80 grams (3 ounces) of feed per day.
Large laying hens fed solely on commercially produced feed consumes can eat between 100 grams (4 ounces) and 170 grams (6 ounces)
The next step is to weight your chicken, or at least make a reasonable estimate of it’s feed consumption, or body weight. This will give you a reasonable estimate of how much Flubendazole to give per day.
The products such as Flubenol are not made up of just Flubendazole. Flubendazole is given as a percentage of the powder in the container!
Below are the dosages for the various percentages that are common in the complete powder product. The dosages are rounded up to what can be realistically estimated using the above method. If you have scales that will measure percentages of a gram there should be enough information here to calculate a more exact dose. Bear in mind that you have a 10X margin of error and it is arguably better to give a larger than necessary dose than it is to under dose.
I’ve taken 100 grams as the average feed consumption of an average chicken.
From below, dose is 6 grams per 2000 grams of feed.
For 100 grams of feed the dose is 0.3 grams at 1% Flubendazole.
For 100 grams of feed the dose is 0.15 grams at 2.0% Flubendazole.
For 100 grams of feed the dose is 0.12 grams at 2.5% Flubendazole
For 100 grams of feed the dose is 0.075 grams at 4.0% Flubendazole
For 100 grams of feed the dose is 0.05 grams at 6% Flubendazole.
The treatment is for 7 days.
For Gapeworm it is recommended the dosage be doubled.
The easiest method I've found of administering the correct dose to an individual chicken is to mix the Flubendazole compound with either a very small amount of water, or a liquid vitamin supplement so that I end yo with a small quantity of paste. I then dip small pieces of slightly stale bread in the paster, let the paste soak into the bead and feed by hand to the chicken.
Flubendazole is not suitable for birds other than chickens.