Abstract

ARDUSSO, GL. et al. Incidence of trichostrongylides in relation to the patterns of front swirls in cattle. InVet [online]. 2018, vol.20, n.1, pp.37-45. ISSN 1668-3498.

Transmission of gastrointestinal nematodes from grazing ruminants is associated with the ingestion of their infective larvae distributed in pastures. In order to analyze if the incidence of parasitism in cattle could be influenced by associated to hair whorl position of the head, the mean intensities and 95% confidence intervals of nematode egg counts were evaluated by gram of fecal material (epg) of 126 samples cattle of 8 to 10 months old in three ranchs of Aberdeen Angus. The values were for animals with high whorl 203.7 (155.6-259.3), 300.1 (200-440.1) and 360 (200-520), for animals with middle whorl 253.4 (173.3-360.1), 417 (216.6)-600.7) and 416.7 (341.67-500), and for animals with low whorl 250 (186.4-318.2), 362.8 (212.5-525.5) and 433.6 (350.06-522.6) in the herds Villegas, Zavalla and Tierra. In the three rodeos, the animals with medium and low whorl presented higher trends in their mean incidences, while in animals with high hair whorl, the average incidences tended to be lower. Other factors, besides behavior, can influence the intensities of parasitism by trichostrongylid nematodes according to the types of swirls. Understanding the differences is probably associated with explaining how the grazing style is conformed in the groups of animals in relation to each subtype in the intake zone.

Keywords : Gastrointestinal nematode; Cattle; Incidence; Whorl; Swirls.

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