"牛羊贫血病" can be translated as "anemia disease in cattle and sheep" or more precisely as "cattle and sheep anemia (disease)".
"Anemia" refers to the medical condition of having a lower-than-normal number of red blood cells or hemoglobin in the blood, resulting in reduced oxygen transport.
"Cattle and sheep" specifies the animals affected.
The phrase can be presented as a noun phrase (e.g., "Cattle and sheep anemia is a concern in some regions") or with "disease" added for clarity (e.g., "Anemia disease in cattle and sheep").
In professional or veterinary contexts, the latter might be slightly redundant but ensures unambiguous meaning. For brevity, "cattle and sheep anemia" is commonly used.