ORIGINAL PAPER
Age-related changes of serum leptin, insulin, IGF-I
and thyroid hormones levels in growing Jinhua
and Landrace gilts
1
Key Laboratory for Molecular Animal Nutrition of Ministry of Education, Institute of Feed
Science, Zhejiang University,
HangZhou, 310029, P.R. China
2
College of Animal Science, Henan Institute of Science and Technology,
XinXiang, 453003, P.R. China
Publication date: 2008-10-27
Corresponding author
Z. R. Xu
Key Laboratory for Molecular Animal Nutrition of Ministry of Education, Institute of Feed Science, Zhejiang University, HangZhou, 310029, P.R. China
Key Laboratory for Molecular Animal Nutrition of Ministry of Education, Institute of Feed Science, Zhejiang University, HangZhou, 310029, P.R. China
J. Anim. Feed Sci. 2008;17(4):548-558
KEYWORDS
ABSTRACT
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.
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