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| 无结核病牛群无结核病牛群指连续两次结核菌素试验无病的乳牛群 | |||
| 基础种畜群; 种畜繁殖群; 无结核病牛群 | |||
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accredited herd : 1 phrase in 1 subject |
| Animal husbandry | 1 |
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