Influence of the age of first insemination and first calving in Holstein - Friesian heifers on farm economic efficiency.
| Autor: | Stankov, K.1 kocestankov@abv.bg |
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| Zdroj: | Agricultural Science & Technology (1313-8820). Dec2020, Vol. 12 Issue 4, p379-383. 5p. |
| Databáze: | Academic Search Ultimate |
| Externí odkaz: |
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