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Recent studies on dictyocaulus filaria and other lungworms of sheep and goats in india

, : Recent studies on dictyocaulus filaria and other lungworms of sheep and goats in india. Journal of Nuclear Agriculture & Biology 11(1): 1-5

Additional areas of the country were surveyed for lungworm infections in sheep and goats. More sheep than goats and more sheep of the private breeders than of government flocks were found infected. Infection with D. filaria and unidentified species of Varestrogylus and Protostrongylus were reported from sheep and goats and Muellerius spp. only from sheep. Studies in the Chokla breed of lambs showed that a dose of 150 third stage larvae of D. filaria/kg body wt to a 4-6 mo. old lamb (150 l/kg) was the most suitable dose for establishment of infection in lambs for D. filaria vaccine work. It was possible to reduce this primary dose of infection in lambs to only 75 l/kg, without significantly affecting the total estimated larval yields during patency, provided infected lambs were treated with a total dose of 14 mg of betamethasone, administered in divided doses either during days 5-15 or days 30-40 of infection. About 0.36 million lambs were successfully immunized against D. filaria in the endemic areas with the vaccine produced at the Srinagar laboratory. Lambs infected with D. filaria at the time of vaccination developed poor protection following vaccination in comparison to lambs free from the infection. This posed a problem in the field of stimulating a satisfactory protection in lambs found infected with D. filaria at the time of vaccination. Very young lambs, aged 6-10 wk, were effectively protected against D. filaria by vaccination under field conditions. Goats are more susceptible hosts to D. filaria than sheep. Laboratory studies have shown that young kids, like lambs, can be effectively immunized against D. filaria by double vaccination with 50-krad .gamma.-irradiated larvae.

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