Jefferslivestock.com carries valbazen...a cattle/sheep wormer. You can call them. I just bought a 500ml bottle a few weeks ago. It expires sometime in 2014. Altogether it was about $42-$44 including shipping. They ship quick.
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There is wormer residue in the eggs, you are unknowingly extending the withdrawal period. Not to mention possible helping with wormer resistance later on down the road. There is a 14 day slaughter withdrawal after using wazine. If the chickens are good to eat then, so are the eggs. Give...
DE wont treat nor kill internal parasites and is a waste of money. I dont recommend giving your chickens aureomycin. It is an antibiotic used to treat fowl cholera, E Coli and some chronic respiratory diseases (CRD) such as MG/MS. I use valbazen to treat for worms, it kills ALL known worms that...
What internal parasites are you dealing with specifically? Coccidia? Roundworms? Cecal worms? Capillary worms? Tapeworms? Gapeworm? Something not mentioned?
Cocci is a protozoa, treat with Corid (amprolium.)
All the worms mentioned (and then some) infect chickens and are in the soil/bugs/worms...