Effects of Experimental Haemonchus contortus Infection on Red Blood Cells and White Blood Cells of Growing Goats

  • Howlader, M.M.R. (Bangladesh Livestock Research Institute) ;
  • Capitan, S.S. (Institute of Animal Science, University of the Philippines Los Banos College) ;
  • Eduardo, S.L. (College of Veterinary Medicine, University of the Philippines Los Banos) ;
  • Roxas, N.P. (Institute of Animal Science, University of the Philippines Los Banos College)
  • Received : 1996.08.30
  • Accepted : 1997.08.12
  • Published : 1997.12.01


A uniform group of 12 upgraded growing goats aged between 6.0 and 7.5 months were used in this study. They were divided into three groups of $T_1$, $T_2$ and $T_3$. Four animals were randomly allocated to each group. They were infected orally with three levels (0 larva, 5,000 larvae and 10,000 larvae) of infective Haemonchus contortus larvae. Before infection, all animals were housed in individual pens with concrete floors. They were provided with a uniform management. Total red blood cells (RBC) and total white blood cells (WBC) were measured by hemacytometric method. Results showed significant interaction effect of H. contortus infection and duration of infection on red blood cell counts. The RBC counts of animals in treatment groups 2 and 3 showed significantly lower values over the control group from the second fortnight to the end of the study. The overall mean RBC values of groups 1, 2 and 3 were 11.73, 9.70 and $9.12million/mm^3$ blood, respectively. H. contortus infection did not significantly influence the total leukocyte counts. Worm infection and duration of infection interaction was also absent on WBC counts. However, the time or duration of infection significantly influenced the WBC counts. Fecal egg counts showed patent infections in the infected animals which also indicated by postmortem worm counts.

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