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Year : 1999
Tome : 150
Volume : 11
Pages : 873-876
Title : Seasonal variations of gastrointestinal nematodes in sheep and goats from semi-arid area in Brazil
Authors : N.A.E. AROSEMENA, C.M.L. BEVILAQUA, A.C.F. MELO and M .D. GIRAO
Summary : Inhamuns backwood, first rank in sheep and goats production in the State Of Cearà, northeastern Brazil, has two well defined seasons : the rainy and the dry season. Climate conditions have an influence on the survival and development of pre-parasitic stages of nematodes and, consequently, the worm burdens in the host. The aim of this work was to obtain data about seasonal variations of gastrointestinal nematodes from sheep and goats and about the strategy mechanism used by abomasal nematodes to survive from a favorable season to the next. Forty-eight necropsies were performed in sheep and goats over a period of one year. Gastrointestinal nematodes prevalence in goats was of 95.9 % and in sheep of 83.3 %. Haemonchus contortus and Trichostrongylus axei were the predominant nematodes, H. contortus being the single nematode present during all the year. Seasonal dynamics worm burdens in both host species have a different seasonal pattern. H. contortus and T. axei larval populations in the abomasal mucosa were too low to allow a reconstitution of the population of parasites in the favorable season. The only alternative mechanism survival for these nematodes is to exist as adult worms in the host.
Keywords : seasonal variations, gastrointestinal nematodes, semi-arid, northeastern Brazil, sheep, goats.
Correspondence : C.M.L. BEVILAQUA
Adress : Facultade de Veterinaria/Universidade Estadual do Cearad, av paranja 1700, 60740-000 Fortazela , Ceara, Brésil

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