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Principal component analysis (PCA) and metabolomics analysis of polar compounds of pigs kept at normal room temperature (20 °C) and pair-fed (PF) to the feed intake of animals in heat stress (HS) (35 °C) for 1 wk. (A). Differences between boars in PF or HS treatments. (B) Differences between gilts in PF or HS treatments (C) Pathway analysis of nonpolar metabolites in gilts in PF or HS treatments showing pathways that are upregulated in HS relative to PF.
