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Feeding of colostrum inactivated for bovine leukosis virus and wet nurse colostrum free from bovine leukosis virus effects on rate of leukosis infection among calves



Feeding of colostrum inactivated for bovine leukosis virus and wet nurse colostrum free from bovine leukosis virus effects on rate of leukosis infection among calves



Monatshefte fuer Veterinaermedizin 40(20): 709-712



Reference is made to latest knowledge on the role played by colostrum and milk, as media of infection, in enzootic bovine leucosis. An account is given of results obtained from experiments to reduce rates of enzootic bovine leucosis infection by feeding acidified colostrum or acidified milk (pH = 4.5) and of results obtained from feeding wet-nurse colostrum of dams which produced negative responses to haematoserological tests on the basis of immune diffusion, prior to first colostrum uptake. Unambiguous decline in infection rates was recordable from two experimental arrangements, which was found to be of great importance to the buildup of no-leucosis young cattle herds with calves from cow herds contaminated with enzootic bovine leucosis. Experimental findings so far obtained are likely to support a milk infection rating between 6 and 8 percent. The conclusion is drawn that diagnosis (haematoserological testing on the basis of immune diffusion, prior to first uptake of colostrum), selection of intrauterinely infected calves, and disruption via colostrum and milk of bovine leucosis virus infection are of great importance to reduction of infection rates in young cattle herds.

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