| prevalence and risk factors associated with intestinal parasites in pigs in chongqing, china. | from 2007 to 2009, the prevalence of intestinal parasites was investigated in intensive and extensive pig farms in chongqing, china. a total of 2971 samples from both sexes and five age categories (breeding boars, breeding sows, fatteners, growers and weaners) were evaluated by standard methods for the presence of helminth ova and protozoan oocysts, cysts and/or trophozoites. of the 2971 pigs sampled, 362(12.18%) were infected with ascaris suum, 301(10.13%) with trichuris suis, 301(10.13%) with ... | 2011 | 21349561 |