Rain in­creases risk of coc­cid­io­sis

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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

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