Different pollens have different amino acid content. Some pollen has more of the 10 essential amino acids (that cannot be manufactured by the bees themselves) than others. Could that be the attractiveness factor? Can they detect the amino acid content? Gorse, field bean, vipers bugloss, oil-seed rape all have 9 of the essential amino acids and are very attractive to the bees.
Will try to search for more info on this.
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