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The present study was aimed to investigate the age-related changes of the serum IGF-I, leptin, insulin, triiodothyronine (T3) and thyroxine (T4) levels in pigs of different breeds. Jinhua and Landrace gilts were sampled at 35, 80 and 125 days of age, respectively. Serum hormone levels were measured with RIA. Serum IGF-I, leptin levels increased with age and displayed breed differences. Jinhua gilts showed lower (P<0.05) serum IGF-I and higher (P<0.05) leptin levels compared with Landrace gilts. In contrast, serum T3, T4 levels decreased with age, Jinhua gilts had lower serum T4 levels at 80 days of age. Meanwhile, Jinhua gilts had higher (P<0.01) serum insulin levels. Serum leptin, IGF-I, insulin and T4 levels correlated with carcass fat content (P<0.05), which suggested that the breed differences of serum hormone levels may contribute to the different phenotypes in adipose tissue deposition.

Age-related changes of serum leptin, insulin, IGF-I and thyroid hormones levels in growing Jinhua and Landrace gilts