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| 乳牛品种平均产量通常指过去5年中乳牛改良协会 (DHIA)记录的平均产量[美] | |||
| 乳牛品种平均产量 | |||
| breed average: 4 phrases in 2 subjects |
| Animal husbandry | 2 |
| Reproductive biology | 2 |
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