Studies on the carbohydrate metabolism of third-stage larvae

Third-stage Haemonchus contortus larvae can derive additional energy from an aerobic metabolism. This is concluded from the following observations: 1 - the larvae exhibit a Pasteur effect, 2 - an electron transport system from NADH 2 and succinate to oxygen, which is rotenone, antimycin A and KCN sensitive, is demonstrable, 3 - cytochrome oxidase is present. Under anaerobic conditions these larvae may meet some of their energy requirements by a NADH 2 -coupled fumarate-succinate system which is tetramisole-sensitive.