
巨大芽孢杆菌1259制剂对比丝兰素、枯草芽孢杆菌对产蛋鸡生产性能及排泄物中氨氮含量的影响
Effects of Bacillus megaterium 1259 Contrast with Yucca and Bacillus subtillis on Performance and Ammonia Nitrogen Content in Excrement of Laying Hens
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