The subject of spring feeding for spring flow buildup has came up. Tec once last year mentioned a publication "Fat Bees, Skinny Bees". https://rirdc.infoservices.com.au/downloads/05-054 Read it for some good education. It's a PDF download.
That is a dandy read, it will take a little time to get through it but looks like some great info even if it is from Oz. Thanks for posting that rast.
Your welcome. Here is a quote from the UF. regarding that article. "The authors of this manual include a list of pollen compositions from some common Australian plants. When reviewing the list, remember that plants within the same genus often have similar protein contents. This list can serve as a guideline for predicting protein content of pollen from similar plants in the US."