Report of J. C. Dalton, M. D., Commissioner of the New York State Agricultural Society, for the Investigation of Abortion in Cows
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" The usual history of infected farms ran Something like this : One or more abortions might have occurred at dif- ferent periods within the last seventeen years, but no two in any one year, nor in any two successive years. These aborting cows were sometimes sold or killed, and sometimes retained, but no manifes- tations of disease followed. Finally, within the last three or four years a cow was bought in calf, either from a farm ' healthy, so far as known,' from a drove, or from a farm known to... be infected. She aborts her calf; and if this takes place early in the fall, other abortions usually follow in the spring. But if this first abortion occurs in the spring, the other cows ordinarily carry their calves to full term for that year, but abort in the following fall and winter. Sometimes a single abortion only occurs for two successive years, and the presence of the epidemic is not manifested until the third year, when a number of abortions show the influ- ence of the disease. In many cases, on endeavor- ing to trace the history of the farm, said to be ' healthy, so far as known,' from which the original aborting cow was obtained, I was unable to get satisfactory information, in consequence of frequent change of owners, or failure of memory on their part.
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