n.俄国
The spermatozoa of Muscovy Drakes consist of two parts: head and tail.
瘤头鸭精子分为头部和尾部.
During the infection of DRV, young Muscovy ducklings are the most susceptible, the mortality is high.
在患病番鸭中, 雏番鸭最为易感, 死亡率很高.
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