Note recent studies indicate osteocalcin-deficient mouse strain without endocrine abnormalities
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4383405/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4689779/
https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1008361