With the development of the reform and opening, the industry of the goats and sheep breeding has been promoted quickly. With the appearance of the large-scale breeding farms and the increase of the breeding density, a various of disease have also occurred, which have incurred great loss to the breeders. The systematic and through investigation was made to the farms of Dongying, and the corresponding measures were raised to the problems. According to the studies, the pathogens of chronic pneumon...
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