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The response of Awassi and Merino sheep to primary infection withHaemonchus contortus

Respuesta De Ovejas Awassi Y Merino A La Infeccion Primaria ConHaemonchus Contartus

Reaction Des Moutons Awassi Et Merinos A L'Infestation Primaire ParHaemonchus contortus

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Summary

The possible existence of breed differences in the response of sheep to primary infection withHaemonchus contortus was examined by comparing worm establishment and pathogenic effects of the parasite in Awassi and Merino sheep of haemoglobin type B infected with 500 third stageH. contortus larvae per kg body weight. The results showed that the Merino sheep had lower faecal egg counts and worm burdens and suffered less severe clinical disturbances than sheep of the Awassi breed. This suggests that genetic resistance operates primarily at the level of worm establishment.

Resúmen

Se investigó la posible existencia de diferencias raciales en la respuesta—de ovejas a la infección primaria conHaemonchus contartus, comparando el establecimiento del parásito y el efecto patógeno en ovejas Awassi y Merino. El parámetro estudiado fue la hemoglobina tipo B. Los animales recibieron 500 larvas (3er. estado) deH. contartus por kilogramo de peso. El resultado favoreció a la raza Merino la cual tuvo recuentos más bajos de huevos por gramo de heces, y síntomas clínicos más benignos que—los de la raza Awassi. Los resultados sugieren, que la resistencia genética opera primariamente a nivel del establecimiento del parásito.

Résumé

L'existence possible de différences dues à la race dans la réaction du mouton à l'infestation primaire parHaemonchus contortus a été examinée en comparant l'installation du parasite et de ses effets pathogéniques chez des moutons Awassi et Mérinos, à hémoglobine de type B, infestés par 500 larves deH. contortus au troisième stade par kg de poids vif. Les résultats ont montré que les moutons Mérinos avaient une numération fécale d'oeufs et des populations de vers plus basses et souffraient de perturbations cliniques moins graves que les moutons de race Awassi. Ceci suggère que la résistance génétique s'opère d'abord au niveau de l'installation du ver dans l'organisme infecté.

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References

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Al-Khshali, M.N., Altaif, K.I. The response of Awassi and Merino sheep to primary infection withHaemonchus contortus . Trop Anim Health Prod 11, 164–170 (1979). https://doi.org/10.1007/BF02237794

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Keywords

  • Public Health
  • Body Weight
  • Veterinary Medicine
  • Primary Infection
  • Cual