Journal of Food, Agriculture and Environment

Effects of different pomace and pulp dietary energy density on growth performance and intramuscular fat deposition relating mRNA expression in beef cattle

Author(s):

Quan-Hui Peng, Zhi-Sheng Wang ^*, Cui Tan, Hai-Bo Zhang, Yong-Na Hu, Hua-Wei Zou

Recieved Date: 2011-10-16, Accepted Date: 2012-01-10

Abstract:

This experiment was conducted to investigate the effects of different grain-dregs dietary energy density on growth performance and intramuscular fat deposition relating mRNA expression in beef cattle. Thirty finishing Simmental cross cattle (Simmental × local cattle) with body weight (BW, 382.6 ± 30.5 kg) were selected and randomly assigned into three dietary treatment groups with 10 cattles in each. The three dietary energy levels were: high energy group (HE, 6.64 MJ NE/kg), medium energy group (ME, 6.31 MJ NE/kg) and low energy group (LE, 5.98 MJ NE/kg). There was no significant difference among the three treatments for the cattle growth performance. Though, compared with LE group, HE group increased average daily gain (ADG) by 10.79%, increased feed conversion efficiency by 6.32%. While the dietary energy density increased, intramuscular fat (IMF) of ME group and HE group increased by 47.5% (P<0.05) and 100% (P<0.01), compared with LE group, respectively. As the dietary energy density increased, peroxisome proliferator activated receptor γ (PPARγ) (P<0.05) and lipoprotein lipase (LPL) (P<0.05) mRNA concentration increased, while the heart fatty acid-binding proteins (H-FABP) (P<0.05) and hormone-sensitive lipase (HSL) mRNA concentration decreased (P<0.05). The results obtained above suggested that high energy density diet incorporated with DDGS increase cattle IMF content by three different pathways, increasing fatty acids de novo synthesis, depressing fatty acid hydrolyzation and promoting differentiation of preadipocytes into adipocytes. 

Keywords:

DDGS, sweet potato slag, IMF, gene expression, beef cattle

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 1
Category: Agriculture
Pages: 404-407

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