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Fatty Acid and Micronutrient Profile of Longissimus Lumborum from Red Angus and Red Angus x Akaushi Cattle Finished on Grass or Grain.
Foods (Basel, Switzerland) 2022 October 32
Cattle diet and breed modify the nutritional profile of beef. The objective of this study was to compare the fatty acid (FA) and micronutrient profiles of Red Angus (RA) and RA x Akaushi (AK) crossbreed steers fed either a grass or grain diet. This two-year study randomly assigned steers to the diets using a 2 × 2 factorial experiment. FAs and micronutrients were analyzed. Diet effect was the strongest with grass-finished beef being higher in n -3 polyunsaturated FAs ( p < 0.001), conjugated linoleic acid ( p < 0.05), vaccenic acid ( p < 0.05), iron ( p < 0.001), and vitamin E ( p < 0.001) compared to grain-finished beef. Breed effects were observed for lauric and myristic acids ( p < 0.05), selenium ( p < 0.05), and zinc ( p < 0.01) with AK containing more of these compounds than RA. Diet × breed effects were non-existent. These results indicate that diet has a stronger influence than breed on modifying the nutritional profile of beef. Because of a more favorable FA and antioxidant profile, consumption of grass-finished beef could benefit human health.
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