My 11 year old daughter is doing a science project with a friend. They are planning on determining the effects of diet change on egg weight/production. They plan on choosing 4 hens and counting/weighing their eggs over a 2 week period on normal feed. Then 2 weeks on just peanuts counting/weighing. Then 2 weeks on a mixture of the 2 feeds. The questions are: How much (peanuts) do we need. 25lbs....50???? Is this SAFE for the hens ?? Thoughts ????