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  • Title: Seasonal prevalence of gastrointestinal nematodes of goats in Pernambuco State, Brazil.
    Author: Charles TP.
    Journal: Vet Parasitol; 1989 Mar; 30(4):335-43. PubMed ID: 2728324.
    Abstract:
    During each of 36 1-month periods from April 1979 to March 1982, 3-4 goats selected from typical farms were necropsied and examined for gastrointestinal nematodes. The goats were male, 12 months old, born on the farm and raised without any anthelmintic application. At the beginning of each month, from April 1981 to March 1982, three 12-month-old male goats shown to be free of gastrointestinal nematodes after anthelmintic treatment were grazed with a flock of naturally infected goats (tracer goats). At the end of each month, these goats were placed on a cement-floored pen and were maintained there for 4 weeks prior to necropsy and examination for gastrointestinal nematodes. Every goat examined was found to be parasitized by more than one species of nematode. Haemonchus contortus, Strongyloides papillosus and Oesophagostomum columbianum were the most prevalent nematodes found. Total worm burdens present in the farm animals were highest during late rainy/early dry season (March-June) and lowest in mid-rainy season (January-February). The acquisition of nematodes by tracer goats occurred mainly from mid-rainy to early dry season (January-June).
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