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Spearman’s correlation analysis between body weight, organ indices, and plasma IGF system components in the three breeds of piglets. DR, Duroc piglet; TYB, Taoyuan black piglet; XCB, Xiangcun black piglet; IGF, insulin-like growth factor; IGFBP, insulin-like growth factor binding protein. The red and blue represent a significantly positive correlation and negative correlation, respectively. * p < 0.05, ** p < 0.01.
