The Life History of Cooperia oncophora (Railliet, 1898) Ransom, 1907, a Nematode Parasite of Cattle

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Abstract
A pure strain of C. oncophora was established by injecting mature worms into the duodenum of a laparotomized, parasite-free calf. Eggs cultured at room temperature (26 to 30 C, 79 to 86 F) hatched within 16.5 hr and reached the first molt 28 hr after hatching. Infective third-stage larvae were observed 124 hr after hatching. Larvae completed the third ecdysis approximately 4 days after being fed to a calf. The final molt occurred 10 days postinfection, and eggs were present in the uteri of females 15 days after infection. The prepatent period ranged from 17 to 22 days.
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