Rain increases risk of coccidiosis
QI stopped using grower pellets containing anticoccidiostat (ACS) as my normal supplier no longer stocked it. Some of my growers were at five weeks and others were at eight weeks. What are the risks of coccidiosis?
A Victoria says: ACS inhibits any coccidia eggs (oocysts) that are eaten so the growers have a trickle infection and get immunity to the coccidia parasite. This immunity can be overwhelmed by sudden wet weather after a dry spell as the coccidia sporulate (form a tough shell) in dry weather and then become infective in the wet conditions. This summer has been very dry, but when the rain came I had to treat several flocks for acute coccidiosis with the licensed product, amprolium. The medication is effective, but only if given in the early stages, so don’t delay treatment. You may have used ACS enough for your eight-week growers, but not for your five-week ones. You should be able to source a local grower ration containing ACS online.
Despite this year’s dry summer, when the rain came several flocks needed treating for acute coccidiosis