ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2015, Vol. 46 ›› Issue (1): 85-95.doi: 10.11843/j.issn.0366-6964.2015.01.011

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Effects of Different Dietary Protein Levels on the Secretion and mRNA Expression of IGF-1 and GH in Sheep

YAN Yun-feng1,2,YANG Hua1*,YANG Yong-lin1,PAN Xiao-liang2, ZOU Yun-long3   

  1. (1.The Breed & Biotechnology Key Laboratory of Sheep in Bingtuan,Xinjiang Academy of Agricultural and Reclamation Sciences,Shihezi 832000,China;2.College of Animal Science and Technology,Shihezi University,Shihezi 832001,China;3.Life Science and Engineering College of Northwest University for Nationalities,Lanzhou 730000,China)
  • Received:2014-05-05 Online:2015-01-23 Published:2015-01-23

Abstract:

The objective of this study was to discuss the effects of different dietary protein levels on insulin-like growth factor-1(IGF-1) and growth hormone(GH) secretion and mRNA expression in sheep,to provide a theoretical basis for scientific preparation of feed and study the growth in sheep.Eighteen 6-month-old prolific Suffolk rams were randomly allocated into 3 treatments with different dietary protein levels(low protein,medium protein and high protein).The concentrations in peripheral blood and mRNA expression levels in skin of IGF-1 and GH were detected at different growth stages(30,60,90 and 120 d) with different dietary protein levels by ELISA and SYBR Green Real-time PCR methods.The results showed that the average daily gain,the concentrations of IGF-1 and GH in peripheral blood,the mRNA expression of IGF-1 in skin were significantly affected by dietary protein levels.However,mRNA expression of GH gene did not change significantly.With the increased protein intake,the growth of sheep was faster,the concentration of IGF-1 was increased,but the concentration of GH was decreased in peripheral blood,mRNA expression of IGF-1 gene was up-regulated.

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