ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (11): 2266-2273.doi: 10.11843/j.issn.0366-6964.2016.11.014

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Effects of Diet Energy and Protein Levels on the mRNA Expression of PPARγ and FABP4 in Adipose Tissues of Tan Sheep

WANG Xiao-fang, ZENG Jie, TIAN Chong-qi, WANG Xiao-long, YANG Yu-xin, CHEN Yu-lin,ZHANG En-ping*   

  1. (College of Animal Science and Technology, Northwest A&F University, Yangling 712100, China)
  • Received:2016-01-27 Online:2016-11-23 Published:2016-11-23

Abstract:

 The objective of this study was to research the effects of diet energy and protein levels on the mRNA expression of peroxisome proliferator-activated receptor γ(PPARγ) and fatty acid binding protein 4(FABP4) in the adipose tissues of Tan sheep. A total of 112(56♂,56♀) healthy Tan sheep with similar body weight were selected and allocated randomly to 4 groups(4 replicates in each group, and 7 sheep in each replicate). 3 stages(22-28, 29-35, 36-40 kg) was classified, and standard diets for each stage were designed according to body weight and expected daily gain in sheep feeding standard of NY/T(816-2004), 4 diets with energy and protein levels of 0.84×Standard(group I), 0.96×Standard(group II), 1.08×Standard(group III), 1.20×Standard(group IV) were assigned to feed sheep in each group, respectively. At the end of each stage, one sheep from each replicate was slaughtered, and samples of tail fat, perirenal fat and subcutaneous fat were collected for analyzing the mRNA expression of PPARγ and FABP4 by Real-time quantitative PCR. The results showed as follows: In tail fat, PPARγ and FABP4 mRNA expression levels was significantly higher in group II than other groups at the end of stage 22-28 and 36-40 kg(P<0.05); FABP4 mRNA expression levels was highest in group II, and lowest in group IV at the end of stage 29-35 kg(P<0.05). In perirenal fat, PPARγ mRNA expression levels was significnatly higher in group II, and significantly lower in group IV compared with group III at the end of 3 stages(P<0.05). FABP4 mRNA expression levels was higher in group II and III at the end of stage 22-28 kg(P<0.05); FABP4 mRNA expression levels was higher in group II compared with group IV at the end of stage 29-35 kg(P<0.05); FABP4 mRNA expression levels was higher in group I and II at the end of stage 36-40 kg(P<0.05). In subcutaneous fat, there was no significant difference between different groups at the end of 3 stages(P>0.05). These results indicated that the effect of diet energy and protein levels on PPARγ and FABP4 mRNA expression was greater in deep fat tissue(perirenal fat) than that in superficial fat tissue(subcutaneous fat) in Tan sheep. The diets with different energy and protein levels had an effect on PPARγ and FABP4 mRNA expression of tail fat in Tan sheep.

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