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I know it was done in another country with a different climate and conditions but Randy Oliver tested feeding a whole load of different pollen substitutes and found they made quite a difference.
In the best cases they resulted in 6 frames of brood vs 3 in the non fed controls.
Both articles with results here.
http://scientificbeekeeping.com/a-comparative-test-of-the-pollen-sub/
In the best cases they resulted in 6 frames of brood vs 3 in the non fed controls.
Both articles with results here.
http://scientificbeekeeping.com/a-comparative-test-of-the-pollen-sub/