Just as amino acids for humans must be balanced, unless bees get their essential amino acids in the correct proportion, any "excess proportion" is simply wasted. The multiple protein sources are mixed to provide the bee necessary proportion of amino acids.
Dry milk is very high in lactose, and lactose is specifically toxic to bees -- they are "lactose intolerant"
Dry milk is moderately high in ash -- (5-7%). Bee bread is 3% ash, and 8% ash is damaging.
The Australian guide has a great "plain english" discussion of this issue.
FAT BEES SKINNY BEES -a manual on honey bee nutrition for beekeepers- https://www.google.com/url?sa=t&rct...=7m4TTOv48fVY3O0KfWgH_Q&bvm=bv.70810081,d.cGE
On lactose intolerance: http://www.google.com/url?sa=t&rct=...=1zRql1PdPEJ7yYmW9v-_gw&bvm=bv.70810081,d.cGE
Dry milk is very high in lactose, and lactose is specifically toxic to bees -- they are "lactose intolerant"
Dry milk is moderately high in ash -- (5-7%). Bee bread is 3% ash, and 8% ash is damaging.
The Australian guide has a great "plain english" discussion of this issue.
FAT BEES SKINNY BEES -a manual on honey bee nutrition for beekeepers- https://www.google.com/url?sa=t&rct...=7m4TTOv48fVY3O0KfWgH_Q&bvm=bv.70810081,d.cGE
On lactose intolerance: http://www.google.com/url?sa=t&rct=...=1zRql1PdPEJ7yYmW9v-_gw&bvm=bv.70810081,d.cGE