Featured Research

from universities, journals, and other organizations

Clean animals result in fewer E. coli

Date:
May 4, 2012
Source:
Norwegian School of Veterinary Science
Summary:
Following the E. coli case in Norway in 2006, when 17 people fell ill and one child died after eating mutton sausages, the meat industry introduced a number of measures in order to reduce the risk of food poisoning from meat. Clean animals and good hygiene during slaughtering are essential preconditions for food safety.

Following the E. coli case in Norway in 2006, when 17 people fell ill and one child died after eating mutton sausages, the meat industry introduced a number of measures in order to reduce the risk of food poisoning from meat. Clean animals and good hygiene during slaughtering are essential preconditions for food safety.

Sigrun J. Hauge has studied the effect of the measures implemented on farms and in slaughterhouses. The aim of the project "Uncontaminated Carcasses" was to uncover data that would help to improve the hygienic quality of meat from cattle and sheep by means of cleaner animals and efficient ways of slaughtering high-risk animals.

E. coli is a commonly occurring bacterium in the digestive tract of humans, animals and birds. Just a few strains are pathogenic and can cause diarrhea and kidney failure, particularly in children. The bacteria die at temperatures over 60-70 C and are therefore normally eliminated by boiling and roasting. Hauge has shown that a new, rapid enzymatic method for detecting E. coli is equally as reliable as the traditional method of growing bacteria culture. This new method is therefore suitable for monitoring E. coli in abattoirs.

High-risk animals

Slaughterhouses have systems for categorizing animals according to how dirty they are. Around 3-5% of the animals that arrive at abattoirs are so soiled that they are categorised as high-risk. Every year, deductions in the price of meat due to dirty animals amount to over 9 million Norwegian kroners. Soiled slaughter can pose a risk to food safety because faeces on hides/wool, intestines, knives and the hands of the butchers can be transferred to the meat during the slaughter process. Hauge studied the factors affecting the cleanliness of animals on farms and how clean or soiled hide affects the contamination of skinned carcasses. Her experiments confirmed that meat from dirty cattle has more E. coli than meat from clean cattle.

Sheep farmers are also subjected to price reductions for dirty and unshorn animals. Hauge's research showed that the surface of meat from shorn sheep has less E. coli than that of unshorn sheep immediately after skinning and that the point in time that the sheep are shorn before slaughtering is also significant when it comes to the amount of bacteria immediately after skinning. But towards the end of the slaughtering process, all the meat had equal amounts of E. coli on its surface, regardless of when the sheep were shorn.

Dirty and unshorn animals are considered a high risk. They are treated in separate product streams in the slaughterhouses and their meat is not used for raw products such as minced meat and cured meat, but for products that are heat treated before sale (such as sausages and meatballs etc.)

99.5% reduction of E. coli

Meat from lambs was hosed with water at 82 C for 8 seconds in an enclosed "shower" -- so-called hot water pasteurization -- before it was cooled. This treatment reduced the amount of E. coli on carcasses by 99.5%. After 5 days of cooling, no further E. coli were found on the meat. The recycled water in the shower was of a good microbiological, chemical and physical quality. Immediately after pasteurization, the meat was rather pale, but it regained its normal colour after being cooled for 24 hours.

Hot water pasteurisation is not generally accepted as a hygiene measure in Norway and the EU and the Norwegian Food Safety Authority would have to give its approval, if the method is to be used at slaughterhouses. Hot water pasteurisation will obviate the need for separate product streams in abattoirs for high-risk sheep.

Cand.agric. Sigrun J. Hauge defended her doctoral research on 2nd May 2012 at The Norwegian School of Veterinary Science (NVH) with a thesis entitled "Hygienic impact of measures related to unclean cattle and sheep at farm level and in the abattoir."


Story Source:

The above story is based on materials provided by Norwegian School of Veterinary Science. Note: Materials may be edited for content and length.


Cite This Page:

Norwegian School of Veterinary Science. "Clean animals result in fewer E. coli." ScienceDaily. ScienceDaily, 4 May 2012. <www.sciencedaily.com/releases/2012/05/120504110031.htm>.
Norwegian School of Veterinary Science. (2012, May 4). Clean animals result in fewer E. coli. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2012/05/120504110031.htm
Norwegian School of Veterinary Science. "Clean animals result in fewer E. coli." ScienceDaily. www.sciencedaily.com/releases/2012/05/120504110031.htm (accessed July 25, 2014).

Share This




More Plants & Animals News

Friday, July 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

How to Make Single Serving Smoothies: Howdini Hacks

How to Make Single Serving Smoothies: Howdini Hacks

Howdini (July 24, 2014) Smoothies are a great way to get in lots of healthy ingredients, plus they taste great! Howdini has a trick for making the perfect single-size smoothie that will save you time on cleanup too! All you need is a blender and a mason jar. Video provided by Howdini
Powered by NewsLook.com
Boy Attacked by Shark in Florida

Boy Attacked by Shark in Florida

Reuters - US Online Video (July 24, 2014) An 8-year-old boy is bitten in the leg by a shark while vacationing at a Florida beach. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
Goma Cheese Brings Whiff of New Hope to DRC

Goma Cheese Brings Whiff of New Hope to DRC

Reuters - Business Video Online (July 24, 2014) The eastern region of the Democratic Republic of Congo, mainly known for conflict and instability, is an unlikely place for the production of fine cheese. But a farm in the village of Masisi, in North Kivu is slowly transforming perceptions of the area. Known simply as Goma cheese, the Congolese version of Dutch gouda has gained popularity through out the region. Ciara Sutton reports. Video provided by Reuters
Powered by NewsLook.com
Tyrannosaur Pack-Hunting Theory Aided By New Footprints

Tyrannosaur Pack-Hunting Theory Aided By New Footprints

Newsy (July 24, 2014) A new study claims a set of prehistoric T-Rex footprints supports the theory that the giant predators hunted in packs instead of alone. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins