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Seasonal development of Ascaris suum eggs in bedding material. Percentage of eggs at different stages of development in bedding material from resting (1), intermediate (2) and latrine areas (3) of pens with shallow litter (farms A, B and C) or deep litter (farms D and E). Results are means of duplicate samples from two pens for starter pigs (excluding Farm E) and two for finisher pigs for each of four seasons. NP denotes that a given area was not present
