The degree of freedom (df) in this test was 1 when χ 2 ≥ 3.84 indicated a significant difference; χ 2 ≥ 6.63 indicated an extremely significant difference.
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Effects of Chlortetracycline Rumen-Protected Granules on Rumen Microorganisms and Its Diarrhea Therapeutic Effect.
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The sentences
When P < 0.05, the difference was considered significant, and when P < 0.01, the difference was considered highly significant.