Residues of organochlorine pesticides and polycyclic aromatic hydrocarbons in farm-raised livestock feeds and manures in Jiangsu, China

► Slightly higher mean residuals of OCPs were found in manures than in feeds. ► α-HCH was the most abundant compound in all kinds of animal feeds and manures. ► The predominance of p,p′-DDE and p,p′-DDT of total DDTs was clearly observed. ► Phenanthrene was the most dominant PAH species in each kind of animal manure. ► PAHs with 3 rings were the primary components in the tested manures.