Following your steak's history from pasture to plate

May 11, 2011

The package on a supermarket steak may say "grass-fed" or "grass-finished," but how can a consumer know whether the cow spent its days grazing peacefully on meadow grass or actually gorged on feedlot corn? In ACS's Journal of Agricultural and Food Chemistry, scientists are now reporting the development of a method that can reconstruct the dietary history of cattle and authenticate the origins of beef.

Frank J. Monahan and colleagues note that consumers are increasingly concerned about the origins and labeling of meat, as they seek assurance about the meat's safety or prepare to pay premium prices for specialty meats that are raised locally or certified as organic. "An example of such a product is pasture-fed beef," they write, "often marketed as superior nutritionally as a result of increased levels of ...arising from the consumption of grass."

To reconstruct the diet of cattle, the researchers analyzed the proportions of different types of oxygen, nitrogen, hydrogen, and sulfur in the animals' and tail hair. Specific diets (for instance, a diet that switched from mostly grass to corn at the end of the cow's life) leave a distinctive "fingerprint" of these elements in cattle tissue. The fingerprint in muscle represents the animal's overall lifetime diet, while quicker-growing tissue in tail hair can reveal more recent dietary changes. Monahan and colleagues say the "provide a powerful tool to reconstruct changes in feed components offered to animals over periods of over a year and thus a tool to verify farm production practices."

Explore further: Chemists modify antibiotic to vanquish resistant bacteria

More information: “Beef Authentication and Retrospective Dietary Verification Using Stable Isotope Ratio Analysis of Bovine Muscle and Tail Hair” J. Agric. Food Chem., 2011, 59 (7), pp 3295–3305 DOI: 10.1021/jf1040959

Stable isotope ratio analysis (SIRA) was used as an analytical tool to verify the preslaughter diet of beef cattle. Muscle and tail hair samples were collected from animals fed either pasture (P), a barley-based concentrate (C), silage followed by pasture (SiP), or silage followed by pasture with concentrate (SiPC) for 1 year (n = 25 animals per treatment). The 13C/12C, 15N/14N, 2H/1H, and 34S/32S isotope ratios in muscle clearly reflected those of the diets consumed by the animals. By applying a stepwise canonical discriminant analysis, a good discrimination of bovine meat according to dietary regimen was obtained. On the basis of the classification success rate, the 13C/12C and 34S/32S ratios in muscle were the best indicators for authentication of beef from animals consuming the different diets. Analysis of 13C/12C and 15N/14N in tail hair sections provided an archival record of changes to the diet of the cattle for periods of over 1 year preslaughter.

add to favorites email to friend print save as pdf

Related Stories

Study shows consumers find grass-fed beef acceptable

Aug 04, 2008

High feed-grain prices and the growing interest in "natural" foods have spurred both consumers and farmers to consider grass-fed beef, and a recent study done by Penn State College of Agricultural Sciences researchers may ...

Can naturally raised beef find its place in the industry?

Oct 18, 2010

As consumer demand for naturally raised beef continues to increase, researchers at the University of Illinois have discovered that naturally raised beef can be produced effectively for this niche market as long as a substantial ...

Greenhouse surprise for red meat

Feb 03, 2010

( -- Beef produced in feedlots has a smaller carbon footprint than meat raised exclusively on pastures, according to the surprise results of a new study.

Recommended for you

Chemical biologists find new halogenation enzyme

Sep 15, 2014

Molecules containing carbon-halogen bonds are produced naturally across all kingdoms of life and constitute a large family of natural products with a broad range of biological activities. The presence of halogen substituents ...

Protein secrets of Ebola virus

Sep 15, 2014

The current Ebola virus outbreak in West Africa, which has claimed more than 2000 lives, has highlighted the need for a deeper understanding of the molecular biology of the virus that could be critical in ...

User comments : 0