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In a study of beef cattle in Limousin, France, suckling calves had an average worm burden of 550 when killed in August, and in those killed at the beginning of October the burden averaged 14 200. The majority were Ostertagia ostertagi and, of these, 49% in August and 83% in October were 4th-stage...

Raynaud, J. P.; Mage, C.; Le Stang, J. P.; Jones, R. M.
Martinus Nijhoff for the Commission of the European Communities., The Hague, Netherlands
Epidemiology and control of nematodiasis in cattle. An animal pathology Workshop in the CEC Programme of Coordination of Agricultural Research, Royal Veterinary and Agricultural University, Copenhagen, Denmark, 4-6 February 1980. (Current Topics in Veterinary Medicine and Animal Science Vol.9.), 1981, pp 193-212