Final answer:
Adult worms of Haemonchus contortus, causing bottle jaw in sheep, are typically found in the sheep's abomasum.
Step-by-step explanation:
The student asked where in a sheep presenting with bottle jaw from Haemonchus contortus one would expect to find adult worms. Haemonchus contortus, also known as the barber's pole worm, is a parasitic nematode that targets ruminants such as sheep. This parasite has a direct life cycle and does not require an intermediate host. The adult worms of Haemonchus contortus are primarily located in the abomasum (the fourth stomach compartment in ruminants) where they attach to the mucosa and feed on the host's blood, leading to anemia and associated symptoms such as bottle jaw, which is edema under the jaw caused by low blood protein levels. The condition is a result of severe infestation and significant blood loss caused by the feeding activities of the worms.