It's a good issue about Peanut Meal for Layers, the comparison is too good scientifically but not economically, the neglect to compare prices of the two items.
Interesting article about Peanut Meal for Layers. Before the advent of soya, groundnut (because the nut is buried underground) cake as we call it was the protein source of choice. In Nigeria, it is usually 100-200$ per ton less than soya meal. The concern for aflatoxin is grave so it is not recommended for use in breeders. With the severe shortage of soya in 2008, feedmillers have resorted to 100% gnc, versus other years when it was a combination of soya bean meal, groundnut meal or cake and sometimes cottonseed cake (with Ferrous sulphate).
A comprehensive reseach should be conducted on peanut meal usage in animal feed, especially the digestability co-efficient and it will be realise that soya is still a better source of plant protein.
The peanut meal use is limited to those countries who have local crop of nut with sufficient quantity to produce meal; in other countries it is not practical and again, level of aflatoxins is not easy to control in this type of ingredient.