Bioaccessibility Minerals in Unaged and Aged Meat of Hereford and Braford Steers27 June 2013
A study by researchers from the agricultural university in Montevideo, Uruguay has found that ageing beef has a negative effect on both the selenium and haem iron in the muscles of the meat.
The research by A. Ramos, M.C. Cabrera and A. Saadoun examined the bioaccessibility of selenium, copper, zinc, manganese iron and heme iron content in unaged and aged meat of Hereford and Braford steers fed pasture.
The content and the bioaccessibility of selenium, copper, zinc, manganese and iron were determined in unaged and aged meat (14 days) from the Psoas major (PM), Gluteus medius (GM) and Longissimus dorsi (LD) muscles of Hereford (H) and Braford breed (B) steers fed pasture.
Furthermore, the content of haem iron was determined in the same muscles.
The Hereford cattle had a lower content of copper and a higher content of iron. Also, the Hereford cattle had more haem ironthan the Bradfords.
The bioaccessibility in unaged meat for selenium, copper, zinc, manganese and iron ranged between 75 and 91 per cent, 30 and 45 per cent, 40 and 68 per cent, 55 and 95 per cent, and 60 and 70 per cent, respectively.
After aging, the bioaccessibility for the same minerals ranged between 58 and 80 per cent, 30 and 48 per cent, 40 and 58 per cent, 75 and 95 per cent, and 59 and 70 per cent, respectively.
Aging affected negatively the selenium content and its bioaccessibility, in the two breeds.
Also, the haem iron content was negatively affected by aging in all muscles and both breeds.
The research found that breed and ageing determined differences in iron and haem iron content.