季节对泌乳牛排粪量及粪中N、P、Cu、Zn量的影响
계절대비유우배분량급분중N、P、Cu、Zn량적영향
Study on the Effect of Season on Produce Faecal Output and N, P, Cu and Zn Pollutant Excretion in Lactating Cow Faecal
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