Which factor might increase the likelihood of a Haemonchus contortus infestation among goats?

The likelihood of a Haemonchus contortus infestation among goats is significantly influenced by high stocking density. When goats are kept at a higher density, they are in closer contact with each other and share more space in the grazing environment. This close proximity facilitates the transmission of parasites, including Haemonchus contortus, especially since the eggs and larvae shed in feces can contaminate the grazing areas. In situations where there are more animals in a confined area, the chances of ingesting infective larvae increase, thereby heightening the risk of infestation.

While environmental factors such as temperature and moisture levels do play a role in the lifecycle of Haemonchus contortus, the direct connection of high stocking density with increased transmission dynamics among the goats makes it the most critical factor in this context. Keeping goats at lower densities can help reduce the risk of infestation by limiting their exposure to infective stages of the parasite.