“Woe to those who lie on beds of ivory and stretch themselves out on their couches, and eat lambs from the flock and calves from the midst of the stall... they shall now be the first of those who go into exile... ” (Amos 6:4-7 ESV).
Apparently, God condemns not only the eating of lambs and calves, who represent farm animals in general, but also the use of ivory (thanks to Mr. Dean Edridge for reminding me).