Researchers led by Oddvar Fossum, at the National Veterinary Institute in Sweden, noted that during the switch in housing from battery cages to enriched cages and litter-based systems, including free-range, there was an increase in the number of chickens dying. During the study, the authors compared the causes of deaths in flocks of chickens kept in different types of housing across Sweden.
The Swedish Animal Welfare Act from 1988 mandated a switch from battery cages for laying hens to alternatives, including free-range and indoor litter-based systems, allowing birds to behave naturally. Between 2001 and 2004, there was a large increase in the numbers of flocks being kept in more humane housing.
The cause of death was recorded in 914 hens from 172 flocks. For each of the birds tested, the housing system of their flock was recorded.
There were significantly more deaths in flocks farmed either free-range or from indoor litter-based systems than in flocks of caged chickens. The most common cause of death recorded was bacterial infection, most often caused by E. coli. These diseases were more frequently seen in flocks from litter-based and free-range systems than in caged birds. In addition, free-range chickens and chickens from litter-based housing were more likely to have been pecked by other birds, which can affect welfare and lead to death. Parasitic infections caused by mites were also more common. However, housing did not appear to affect the incidence of viral infections
The authors emphasize that, because of the change in housing systems that occurred between 2001 and 2004, many of the farmers caring for these flocks lacked the experience and knowledge that would have prevented the higher mortality and disease rates.
According to Fossum, “birds kept in indoor litter-based and free-range housing are more prone to disease but measures can be taken to counter this.” Fossum adds,“the health of Swedish laying hens kept in these systems has improved as the farmers have become more experienced in managing the new housing systems.”
Raiding the rape field
23.05.2018 | Julius-Maximilians-Universität Würzburg
New technique reveals details of forest fire recovery
17.05.2018 | DOE/Brookhaven National Laboratory
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
24.05.2018 | Ecology, The Environment and Conservation
24.05.2018 | Medical Engineering
24.05.2018 | Physics and Astronomy