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Related Experiment Videos

Conjugated linoleic acid-enriched beef production.

Priya S Mir1, Timothy A McAllister, Shannon Scott

  • 1Agriculture and Agri-Food Canada, Lethbridge, AB, Canada. mirp@agr.gc.ca

The American Journal of Clinical Nutrition
|May 26, 2004
PubMed
Summary
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Conjugated linoleic acid (CLA) in beef offers potential health benefits. Feeding cattle specific diets, like those rich in linoleic acid or certain pastures, can increase CLA levels in beef for consumers.

Area of Science:

  • Nutritional Science
  • Animal Science
  • Food Science

Background:

  • Canadian beef consumption is significant, with beef being a nutrient-dense food source.
  • Animal fats, including those in beef, face scrutiny regarding health impacts.
  • Conjugated linoleic acid (CLA) in beef exhibits anticarcinogenic properties, driving interest in its enhancement.

Purpose of the Study:

  • To explore methods for increasing conjugated linoleic acid (CLA) deposition in beef.
  • To understand how cattle diets influence CLA content and isomer distribution in meat.

Main Methods:

  • Analysis of CLA content in beef based on different cattle feeding regimens (pasture vs. grain/silage, inclusion of oils).
  • Investigation of CLA isomer distribution (cis-9, trans-11 and trans-10, cis-12) in various beef fat depots.

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Main Results:

  • Feeding cattle linoleic acid-rich oils or specific pasture types increases CLA content in beef.
  • Dietary oil inclusion in feedlot diets significantly boosted CLA from 2.8 to 14 mg/g beef fat.
  • CLA isomers are concentrated in intramuscular and subcutaneous fat, with trans-10, cis-12 isomer predominant in subcutaneous fat.

Conclusions:

  • Dietary strategies can effectively enhance beneficial CLA levels in beef.
  • Beef serves as a dietary source of bioformed CLA, contributing to potential health benefits.
  • Understanding feed-to-meat CLA transfer is crucial for optimizing beef's nutritional profile.