Navigation Links
New study finds no nutritional difference between free-range and cage-produced eggs
Date:8/26/2011

CHAMPAIGN, IL (August 26, 2011) Eggs produced by free-range hens are often perceived by the public to be nutritionally superior to eggs obtained from layers kept in traditional battery cages. However, a recent scientific study has called this popular perception into question by finding essentially no differences in the nutritional quality of eggs produced by hens from both management systems, said the Poultry Science Association (PSA).The findings also showed that cholesterol levels in all eggs were lower than U.S. Department of Agriculture guidelines, prompting the USDA to review and revise downward its estimates for average cholesterol levels in eggs.

The study, "Comparison of Fatty Acid, Cholesterol, and Vitamin A and E Composition in Eggs from Hens Housed in Conventional Cage and Range Production Facilities," appeared in the July issue of Poultry Science, a journal published by PSA. Its author, Dr. Kenneth E. Anderson, a Professor in the Department of Poultry Science at North Carolina State University, collected data for the study in 2008 and 2009. The study was conducted concurrently with the North Carolina Layer Performance and Management Test (NCLP&MT), which evaluates the major commercial layer lines used in the United States.

"The key take away from this research is that an egg, no matter where it's produced, is a very nutritious product. Eggs from a range production environment did have higher levels of total fat than eggs produced by caged hens, but they did not have higher levels of cholesterol. Perhaps the most striking finding was that both cage- and range-produced eggs actually have lower cholesterol levels than previously believed, which has led the USDA to lower the cholesterol guidelines for eggs in the USDA Nutrient Database for shell eggs to 185 mg per egg, down from 213 mg," said Dr. Anderson.

Research Framework

Dr. Anderson conducted his study in North Carolina using more than 400 Hy-Line Brown pullets. The pullets were raised in accordance with the laying environment (range or cage) in the 37th NCLP&MT. All of the pullets in the study were hatch mates. Identical rearing dietary programs were used for both the range and cage pullets, with the only difference being the access the latter group had to the range paddock, a common hay mixture for North Carolina comprising both warm- and cool-season forages.

Pullets designated for the range facilities were brooded on litter until 12 weeks of age and then moved to a range environment. At 17 weeks, they were then moved to one of three production range paddocks. A parallel pattern was followed for the cage hens, which were reared in a cage rearing facility, and then at 17 weeks assigned to one of three groups of laying cages. All other rearing parameters were maintained as similar as possible.

Research Findings

Egg samples were collected at 50, 62, and 74 weeks of age during the productive life of the flock and sent to four different laboratories commonly used for egg nutrient analysis. The results showed no influence of housing environment (range or cage) on egg levels of vitamin A or vitamin E. However, β-carotene levels were higher in the range eggs, which, according to Dr. Anderson, may have contributed to the darker colored yolks observed in these eggs during the study. The study also found no difference in cholesterol content between range- and cage-produced eggs. Based on these results, Dr. Anderson concluded that "a significant nutritional advantage of eggs produced by chickens housed on range versus in cages could not be established."


'/>"/>

Contact: Egg Nutrition Center
info@incredible-egg.org
312-233-1211
Edelman Public Relations
Source:Eurekalert

Related biology news :

1. Clinical study shows young brains lack the wisdom of their elders
2. No need to nag: study finds doctors nutrition advice hits home early
3. MU study links inactivity with risk factors for Type 2 diabetes
4. Study confirms food security helps wildlife
5. New CU-Boulder study reveals bacteria from dog feces in outdoor air of urbanized air
6. Mount Sinai receives $3.4 million for largest study of personalized medicine in the clinical setting
7. Study aims to improve fuel economy by 30 percent
8. Life on the wind: Study reveals how microbes travel the Earth
9. Study: New process that can save at-risk cancer patients is effective and significantly less costly
10. National Institutes of Health renews successful infectious disease research study
11. Study helps assess global status of tuna and billfish stocks
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/27/2016)... Ohio , Jan. 27, 2016  Rite Track, ... based in West Chester, Ohio ... award winning service staff, based in Austin, ... capacity and ability to provide modifications, installations and technical ... Dovalina , CEO of PLUS, commented, "PLUS has provided ...
(Date:1/22/2016)... DUBLIN , Jan. 22, 2016 /PRNewswire/ ... announced the addition of the "Global ... report to their offering. --> ... of the "Global Biometrics Market in ... offering. --> Research and ...
(Date:1/20/2016)... JOSE, Calif. , Jan. 20, 2016 /PRNewswire/ ... developer of human interface solutions, today announced sampling ... controller solution for wearables and small screen applications ... such as printers. Supporting round and rectangular shapes, ... S1423 offers excellent performance with moisture on screen, ...
Breaking Biology News(10 mins):
(Date:2/8/2016)... 8, 2016  BioElectronics Corporation (OTC Pink: BIEL), ... today that it is responding to a notice ... Securities and Exchange Commission posted on the agency ... of the Board of BioElectronics Corporation and the ... at The Fuqua School of Business, Duke University.   ...
(Date:2/8/2016)... has an active R&D program for the development ... the Group has a unique research and development center in ... developing Bio Control products. Stockton has ... and regulatory guidelines, and is active in more than 35 ... Stockton,s flagship product Timorex Gold ® ...
(Date:2/5/2016)... -- ATCC, the premier global biological materials resource and ... life science researchers that are working to address the ... CDC website . --> CDC website ... single-stranded RNA virus of the Flaviviridae family, genus Flavivirus, ... Viruses. Zika virus is transmitted to humans primarily through ...
(Date:2/4/2016)... ... February 04, 2016 , ... Morf ... today announced an interactive FDA compliance training course, Writing Effective ... Professional Society) accredited interactive course on Morf Playbook—now conveniently available on smartphones and ...
Breaking Biology Technology: