Lactation is an energetically costly process that depends on the sow’s ability to consume enough energy to sustain milk production, but voluntary feed intake is biologically limiting, according to Sai Zhang and Nathalie L. Trottier of Michigan State University, Jay S. Johnson of the U.S. Department of Agriculture Livestock Behavior Research Unit and Mu Qiao of the Hubei Academy of Agricultural Sciences in Wuhan,
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