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Janet · 09-07-2013, 11:20 AM posted to uk.rec.gardening

In article , says...

Bones rot down in an active heap in between a few months and a few
years, depending on the size and age of the animal and whether the
bone was load-bearing. For example, the carcass and leg bones of
a chicken typically take 2 years, but the smaller bones disappear
within a year. The leg bones of a mature ox would probably take
the best part of 10 years, but lamb shanks take about 3-5.

My dog is still excavating the huge knuckle bones of mature ox which
she buried fresh up to 10 years ago. In her opinion they haven't
deteriorated at all.

Janet