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The Erhualian (EHL) pig possesses significantly lower growth rates andhigher adipose deposition compared with the Large White (LW) pig. To furtherunderstand the mechanism of breed lipid deposition difference at the earlypostnatal age, we employed an animal model of EHL and LW pigs at weaning age tocompare the lipid metabolism differences in subcutaneous fat. The resultshowed that serum triglyceride in EHL was significantly higher(P < 0.05) than that of LW. Peroxisome proliferator-activated receptor-γprotein level in EHL was significantly higher (P < 0.01) though CCTTAenhancer-binding protein level demonstrated no change compared with LW pigs.Hormone sensitive lipase, adipose tissue triglyceride lipase mRNA expressionand the lipase activity were significantly lower (P < 0.05) in EHL.Uncoupling protein-2 protein content was significantly lower (P < 0.01) in EHL than that in LW pigs. We first cloned the nucleotide sequenceof Zinc-α2-glycoprotein (ZAG) with 1090 bp and found that both ZAGmRNA expression and protein level in EHL pigs was significantly lower(P < 0.01) than that of LW pigs. β3 adrenergic receptor mRNAexpression in EHL pigs was significantly higher (P < 0.01) than that of LWpigs, though tumour necrosis factor α gene expression demonstratedno significant difference. Therefore, the significant breed lipid metabolismdifference in subcutaneous fat exists at an early postnatal agebetween EHL and LW pigs, and this difference may originate from two causesincluding the increased lipid synthesis and reduced lipid mobilization inEHL pigs compared with LW pigs

Breed-specific lipid-related gene expression in the subcutaneous fat of Large White and Erhualian pigs at weaning