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Here's the science. A Cornell University study http://poisonousplants.ansci.cornell.edu/toxicagents/tannin.html on tannins says this about tannins and poultry : In poultry, small quantities of tannins in the diet cause adverse effects. levels from 0.5 to 2.0% can cause depression in growth...

Tannins in wood are concentrated in the bark. The concentration in the pulp, the part that commercial pine shavings come from, is minimal. I've been raising chickens for ten years on wood chippings and shavings, and I've not seen any problems arise form it.