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Laying hens in furnished cages

use of facilities, exterior egg quality and bird health

Wall, Helena (2003). Laying hens in furnished cages. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Agraria, 1401-6249 ; 406
ISBN 91-576-6423-4
[Doctoral thesis]

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Abstract

Concern for the welfare of laying hens housed in conventional cages has led to a change of the Animal Welfare Legislation in Sweden, implying that cages must provide possibilities for hens to lay eggs in a nest, to rest on a perch and to use litter. Such requirements are also being considered within the whole European Union. The purpose of this thesis is to contribute to the general knowledge of, and further development of, furnished cages, both as regards birds’ use of facilities and their welfare, as well as with regard to production. The furnished cages housed 6 to 16 birds and the genotypes included were the commercial hybrids Lohmann Selected Leghorn (LSL), Hy-Line White and Hy-Line Brown. Passive Integrated Transponders were used in order to record individual bird’s use of litter baths, nests and passages through pop holes in larger cages divided into two halves. With some exceptions, nest and perches were generally used by 80-90% of the birds, and nest use was affected by nest design. There was a very large variation in the number of days individual birds visited the litter bath, and almost 30% of the birds never entered the baths. Frequent use of litter affected neither a hen’s exterior appearance (feather cover, pecking wounds) nor her estimated level of stress. Providing cages for larger groups of hens with a partition with pop holes, in order to improve their escape possibilities, did not affect any of the measured welfare traits. However, the pop holes were frequently used and the cage proved to work in all practical aspects. Two different measures to reduce egg shell cracks, both reducing the speed of the eggs on their way out of the nest, proved to be very efficient. Egg production and mortality rates were normal and similar to levels recorded in conventional cages. Differences in behaviour, indicators of stress and fear, exterior egg quality and exterior appearance were identified between genotypes. In conclusion, most birds found nests and perches attractive, whereas litter was used to varying extents. With inexpensive measures to reduce egg cracks, the proportion of cracks can be reduced to the level found in conventional cages.

Authors/Creators:Wall, Helena
Title:Laying hens in furnished cages
Subtitle:use of facilities, exterior egg quality and bird health
Year of publishing :August 2003
Volume:406
Number of Pages:36
Papers/manuscripts:
NumberReferences
IWall, H., Tauson, R. & Elwinger, K. 2003. Layers’ individual long-term use of litter in furnished cages – effects of substrate and genotype. (Submitted)
IIWall, H., Tauson, R. & Elwinger, K. 2003. Pop hole passages and welfare in furnished cages for laying hens. (Accepted for publication in British Poultry Science)
IIIWall, H., Tauson, R. & Elwinger, K. 2002. Effect of nest design, passages, and hybrid on use of nest and production performance of layers in furnished cages. Poultry Science 81, 333-339.
IVWall, H. & Tauson, R. 2002. Egg quality in furnished cages for laying hens – effects of crack reduction measures and hybrid. Poultry Science 81, 340-348.
Place of Publication:Uppsala
Publisher:Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences
ISBN for printed version:91-576-6423-4
ISSN:1401-6249
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:N Machinery and buildings > N10 Agricultural structures
L Animal production > L01 Animal husbandry
Subjects:Not in use, please see Agris categories
Agrovoc terms:layer chickens, cages, behaviour, nest boxes, animal welfare, egg production, poultry housing
Keywords:behaviour, passive integrated transponder, modified cage, enriched cage, nest, litter bath, dust bath, perch, pop hole, layer
URN:NBN:urn:nbn:se:slu:epsilon-68
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-68
ID Code:333
Department:(VH) > Dept. of Animal Nutrition and Management
Deposited By: Helena Wall
Deposited On:25 Aug 2003 00:00
Metadata Last Modified:19 Mar 2015 10:08

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