Actually, getting food products from Pokemon is fine with me. Chansey eggs (unfertilised of course), Miltank milk, Tropius fruit... what have you. Slowpoke tails are a bit more questionable, since it might be hurting the Pokemon, though.
Speaking of which: Fertilised Pokemon eggs are the ones with green spots (games)/species-specific markings (anime). If the shell is white, that means it's unfertilised.