日粮维生素C和锰水平对种公鸡精液品质及种蛋受精率的影响
일량유생소C화맹수평대충공계정액품질급충단수정솔적영향
Effect of Vc and Manganese Levels in Diet on Se-men quality of Breeding Cock and Fertility of Set- ting Egg
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