In case anyone is curious, here are the links to a few of those studies.
https://www.researchgate.net/figure/Performance-of-laying-hens-fed-carrot-and-beetroot-meal_tbl1_335823277...
There are studies with laying hens being fed beet pulp. As of right now the data shows that as long as it makes up less than 10% of they’re diet, there shouldn’t be a problem. Research has also suggested that beetpulp may increase retinol content in the eggs. It’s one of those ingredients that...