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Prevalence of Cooperia punctata, C. pectinata and C. oncophora infections in dairy calves in Brazil

Published online by Cambridge University Press:  05 June 2009

M. P. Guimaraes ,
H. M. A. Costa  and
W. S. Lima
M. P. Guimaraes
Affiliation:
Department of Parasitology ICB, Federal University of Minas Gerais, 31270–Belo Horizonte, Minas Gerais, Brazil
H. M. A. Costa
Affiliation:
Department of Parasitology ICB, Federal University of Minas Gerais, 31270–Belo Horizonte, Minas Gerais, Brazil
W. S. Lima
Affiliation:
Department of Parasitology ICB, Federal University of Minas Gerais, 31270–Belo Horizonte, Minas Gerais, Brazil
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Abstract

Cooperia is the most prevalent helminth parasitizing calves in Brazil. Three species of this genus occur most often: C. punctata, C. pectinata and C. oncophora. Six calves from dairy farms in the south of the State of Minas Gerais aged six to 15 months were killed and necropsied each month over a period of two years. The Cooperia species were identified, counted, and the numbers related to the calves' age. The worm burdens due to the three species of Cooperia were statistically different. C. punctata was the most prevalent species and had a positive correlation with the age of the calves; C. pectinata appeared with lower intensity but was always present, and C. oncophora was not found in calves older than 11 months. These results show the existence of different degrees of resistance to Cooperia species among calves as the three species did not behave similarly. It seems to be an acquired resistance. C. punctata appears to be less immunogenic than C. pectinata and C. oncophora. As C. punctata and C. pectinata are more pathogenic than C. oncophora, it seems that this pathogenicity can be related to immunogenic aspects associated with the species.

Keywords

Cooperia punctataCooperia pectinataCooperia oncophoracattleBrazilprevalence
Type
Research Note
Information
Journal of Helminthology , Volume 64 , Issue 4 , December 1990 , pp. 319 - 322
Copyright
Copyright © Cambridge University Press 1990

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