Coadwell W J, Ward P F
Parasitology. 1982 Oct;85 (Pt 2):251-6. doi: 10.1017/s0031182000055220.
Clun forest sheep, worm-free from birth, were given a single dose of 20 000 infective larvae of Haemonchus contortus. The total number of eggs/day in the faeces was recorded for 21 infections and data on population size, sex ratio and individual worm development were collected from 76 sheep. The female to male ratio was 1.28 +/- 0.07 (S.E.). The relation between increase in worm size and uterine egg content was linear. The number of eggs present in the uteri was found to be an accurate measure of eggs passed. It was shown that the daily faecal egg output is related to total parasite weight and is not a measure of the number of individuals present.
出生时无寄生虫的克伦森林羊，被给予单剂量20000条捻转血矛线虫感染性幼虫。记录了21次感染的粪便中每日总卵数，并从76只羊中收集了有关虫口数量、性别比例和个体蠕虫发育的数据。雌雄性别比为1.28±0.07（标准误）。蠕虫大小增加与子宫内卵含量之间的关系呈线性。发现子宫内的卵数是排出卵数的准确指标。结果表明，每日粪便虫卵排出量与寄生虫总重量有关，而非现存个体数量的指标。
