To my knowledge, the best paper on this topic is:
Roulston, T. and J. Cane. 2000. Pollen nutritional content and digestibility for animals. Plant Systematics and Evolution 222:187-209. https://link.springer.com/article/10.1007%2FBF00984102
I'm afraid a firm answer to your question will prove elusive, though.
Doug
Douglas Sponsler
Graduate Research Associate, Ph.D. Candidate
Department of Entomology
The Ohio State University
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