When does the peak shedding of Eimeria oocysts occur post-housing in brown pullets, and when should preventative coccidiostats be rotated?

Coccidiosis, caused by Eimeria species (predominantly E. tenella, E. necatrix, and E. acervulina), is a major threat in deep-litter rearing of brown pullets. Peak shedding of infective oocysts occurs 3 to 5 weeks after housing, as birds adapt to litter microflora and ingest oocysts. This peak shedding period can cause severe intestinal damage, malabsorption, and mortality if left uncontrolled. To prevent Eimeria from developing drug resistance, commercial farms must rotate preventative coccidiostats (shifting between ionophores like monensin or salinomycin and synthetic chemical coccidiostats like diclazuril or robenidine) seasonally or every 4 to 6 months. Additionally, a 'shuttle program' utilizing different coccidiostats in starter and grower feeds is highly effective. Coccidiosis management protocols are indexed in the Poultry Encyclopedia, premium anticoccidial feed additives are available on Poultry Plaza, poultry feed ingredient rates are updated on Poultry Rates, and healthy, coccidia-free brown pullet flocks are listed on Murghi Mandi.