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unge, voksne bier af samme race bør anvendes, dvs. bier på samme alder, i samme foderstand osv. bierne hentes fra tilstrækkeligt fodrede, sunde, så vidt muligt sygdomsfri kolonier, som er dronningret.
young adult worker bees of the same race should be used, i.e. bees of the same age, feeding status, etc. bees should be obtained from adequately fed, healthy, as far as possible disease-free and queen-right colonies with known history and physiological status.
