White or Brown eggs---There is no nutritional difference.

qiaohe

White or Brown: Eggshell colour is determined by the type of hen that lays it. There is no nutritional difference.
White eggs are laid by white-feathered hens.
These are the most common laying hens in Canada. White eggs are usually less expensive than brown eggs.
/ M/ b7 w" s0 m% FBrown-feathered hens usually lay brown eggs.
0 V1 J% f  f1 QProducing brown eggs costs more because brown hens are larger than white ones and they eat more feed.
1 a: ^0 `9 M) k; q6 E( z, U
  N1 h+ j+ P% h: \2 {; a' }Young hens lay pee wee eggs and older hens lay jumbo eggs;

Free-run eggs are nutritionally the same as regular eggs.

Organic eggs are nutritionally the same as regular eggs.

Free-range eggs are nutritionally the same as regular eggs.
: r. K; J# |3 {8 @8 a0 d* h
% }- q/ R. ?! r% d% ?
Here is articles:
5 @: l/ |( W- r4 r+ D3 Zhttp://www.getcracking.ca/EDU/a_guide_to_choosing_eggs.pdf