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Boyner, Malin, 2015. Effect of a zinc amino acid complex on egg production, egg shell quality and external appearance in two laying hen genotypes housed in two different production systems. Second cycle, A2E. Uppsala: SLU, Dept. of Animal Nutrition and Management

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Abstract

With an extended production cycle up to 100 weeks of age, the yearly number of layer
chickens hatched and reared can be reduced, and in turn so can the euthanasia of day-old male
chickens. Lately, the interest for keeping laying hens for a prolonged production cycle has
increased in Sweden as well as in other European countries. However, concerns exist
regarding how prolonged laying cycles affect egg quality, animal welfare as well as producer
economy. In this trial, the two commercial hybrids LSL Classic and Bovans Robust were
housed in furnished cages and a single tier floor production system. In addition to the effects
of age, an organic mineral complex with a hypothesized positive effect on egg quality,
integument and skeletal condition was evaluated. The study was conducted during 20-61
weeks of age. There were no consistent effects of the mineral amino acid complex
supplementation on either egg quality, plumage condition or keel bone deformities at a hen
age of 55 weeks. However, there were a lot of differences between hybrids regarding egg
composition and layer performance in the two production systems. As expected and
concluded in earlier research; egg shell quality, plumage condition and keel bone deformities
were negatively affected by increased hen age.

Main title:Effect of a zinc amino acid complex on egg production, egg shell quality and external appearance in two laying hen genotypes housed in two different production systems
Authors:Boyner, Malin
Supervisor:Wall, Helena
Examiner:Tauson, Ragnar
Series:Examensarbete / Sveriges lantbruksuniversitet, Institutionen för husdjurens utfodring och vård
Volume/Sequential designation:543
Year of Publication:2015
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:VY001 Agricultural Science Programme - Animal Science 270 HEC
Department:(VH) > Dept. of Animal Nutrition and Management
Keywords:laying hens, organic zinc, aged layers, egg shell quality, egg quality, animal welfare
URN:NBN:urn:nbn:se:slu:epsilon-s-4965
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-4965
Subjects:Animal husbandry
Animal feeding
Language:English
Deposited On:13 Nov 2015 10:54
Metadata Last Modified:13 Nov 2015 10:54

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