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Dietary conjugated linoleic acids increase intramuscular fat deposition and decrease subcutaneous fat deposition in

Haibo Zhang1,2, Xianwen Dong1, Zhisheng Wang1

  • 1Key Laboratory for Animal Disease-Resistance Nutrition of China Ministry of Education, Animal Nutrition Institute of Sichuan Agricultural University, Ya'an, China.

Animal Science Journal = Nihon Chikusan Gakkaiho
|November 20, 2015
PubMed
Summary

Dietary conjugated linoleic acids (CLA) supplementation in cattle significantly reduced subcutaneous fat while increasing intramuscular fat. This shift is driven by CLA

Keywords:
cattleconjugated linoleic acidsintramuscular fatsubcutaneous fat

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Area of Science:

  • Animal Science
  • Nutritional Biochemistry
  • Meat Science

Background:

  • Conjugated linoleic acids (CLA) are fatty acids with potential health benefits.
  • Understanding CLA's impact on fat deposition is crucial for livestock production and meat quality.

Purpose of the Study:

  • To investigate the effects of dietary CLA on intramuscular and subcutaneous fat deposition in Yellow Breed × Simmental cattle.
  • To elucidate the molecular mechanisms underlying CLA-mediated fat partitioning.

Main Methods:

  • A 60-day feeding trial comparing dietary CLA supplementation with a control group.
  • Analysis of backfat thickness, fat percentages (subcutaneous and intramuscular), and key enzyme activities.
  • Gene expression analysis of lipogenic and lipolytic markers in Longissimus muscle and subcutaneous fat.

Main Results:

  • Dietary CLA significantly decreased backfat thickness and subcutaneous fat percentage.
  • Intramuscular fat percentage was significantly higher in cattle fed CLA.
  • CLA supplementation increased the activity and gene expression of lipogenic enzymes (e.g., FAS, ACC, SREBP-1) in muscle and lipolytic enzymes (e.g., LPL, HSL, CPT-1) in subcutaneous fat.

Conclusions:

  • Dietary CLA effectively alters fat deposition in cattle, enhancing intramuscular fat while reducing subcutaneous fat.
  • CLA increases intramuscular fat by up-regulating lipogenic gene expression.
  • CLA decreases subcutaneous fat by up-regulating lipolytic gene expression.