If you can make a homemade bone soup with the femur bone down to the knuckle's end, and you can simmer it for days to extract these ancient nutrients, do it!! (ancestralsupplements.com)
Also, if you haven't already (which I doubt) try adding beef tendon to your next batch of bone soup. (marksdailyapple.com)
In concentrated feed lots, unhealthy animals accumulate toxins in fat tissues and the CNS... lots of fat tissues here (especially in the marrow)... for anyone that has made bone soup before, you know what I'm talking about. (marksdailyapple.com)