Overfeeding sows and gilts during gestation is a common mismanagement practice. Here's how concrete stalls were built for individual feeding to assure a minimum, but adequate, amount of feed for each animal.
Bear, W. Forrest and Speer, V. C.
"A Look-Ahead Feature - Sow Stalls for Indiviudal Feeding,"
Iowa Farm Science: Vol. 16
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol16/iss10/3