As hog producers spread out farrowings over the year, interest is increasing inmethods of heating central farrowing houses. Some methods have been sucessful, while others haven't. Here are some of the factors to consider.
Hull, Dale O. and Pedersen, John H.
"Heating Central Farrowing Houses,"
Iowa Farm Science: Vol. 12
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol12/iss6/2