[Immune response in sheep experimentally infected with Haemonchus contortus, Comparative study in male and female...

Merino breed sheep eight months old at the beginning of the experiment and carriers of hemaglobin A were used. They were infected one or more times with H. contortus larvae and then challenged with 500 or 5000 larvae L3. Self-cure was reproduced and animals were found immune after infectation. Self-cure was more evident in females than in males and immunity was also better and appeared earlier in females than in males.