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The Parasitic Life Cycle
Resistance of Pigs to Infestation
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Ackert acquired immunity adult age resistance animals Anthelmintic appeared ascariasis Ascaridia galli Ascaris lumbricoides Australorps autopsy birds capsule carbontetrachloride castor oil cent chickens conditions of desiccation considered days old desiccation dosage drug effective efficiency eggs per day embryonated eggs embryos eosinophile examined experiments exposed exposure faeces feeding flock treatment fourth-stage larvae fowl fresh eggs gain in weight given Graph guinea pigs haemorrhages hatching helminth increase incubated indicate infectious eggs infested birds intestine wall Jour kidneys large number larvae lesions liver lungs mash mean weekly gain moult Nematode nicotine sulphate number of eggs number of worms occurred oesophagus parasite parasitic life cycle pathogenic Period of Infestation pleural cavity Poultry roundworm seven days showed single dose small intestine stage sunlight survived symptoms temperatures third-stage larvae toxic treated birds trial weeks whilst young birds young pigs