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As a newbie I can see how it can be confusing, it was for me. which is why I started researching the proper amounts to give poultry. The information needed is out there. I promise you that the amount you are giving is the correct amount for a your sized hen. Any less and you might not treat capillary worms effectively. Not saying your hen has capillary worms, but with the 0.5ml you are giving for five days you can almost certainly rule them out.Well as a newbee I sure have learned a lot. I've also become very confused. Does anyone know why there isn't a dewormer made specific for poultry with information specific for the worms/parasites it kills. It certainly seems like I could make a killing with a new product!
The wormers they use are used "off label" under the supervision of a veterinarian. Valbazen and Safeguard both fall into this category.There really isn't a large backyard chicken market that would justify all the research and money it takes to get new medication approved for use. Commercial chicken farmers don't need dewormers since their animals (generally) never touch the ground.
Abstract
Fenbendazole 4% (Panacur, Hoechst) administered in feed was used to treat chickens infected with Ascaridia galli, Heterakis gallinarum and Railletina spp. It was also used to treat Syngamus trachea in broiler birds. There was a marked drop in helminth egg counts in the faeces on the second day of treatment and the faeces became negative by the seventh day after the last treatment. Post-mortem examination 15 to 21 days later showed that the drug was 100% effective against Ascaridia galli and Heterakis gallinarum at 10 mg/kg. However, for complete removal of Railletina spp. 15 mg/kg was required. Similarly 20 mg/kg fenbendazole was effective against Syngamus trachea. It was concluded that fenbendazole is suitable for the treatment of the important intestinal and tracheal worms of poultry, a dose of 15 to 20 mg/kg for 3 consecutive days being recommended for use under field conditions.