I'm sorry it took so long for me to get back to you. I'm feeling crummy today!!
Here's a link on the nutritional value of chia seeds:
Nutrition Facts and Analysis for Seeds, chia seeds, dried
Chia seeds themselves are good cavy food, with a calcium/phosphorus ratio of 3.93, over the minimum of 1.33, but negligible vitamin C content. Sprouting them will increase the C content, especially once they are exposed to light and turn green. I can't find anything regarding the nutritional content of chia sprouts at all!
Anyone else have other info?