4.1 Review

Advances in genetic selection and breeder practice improve commercial layer hen welfare

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Review Agriculture, Dairy & Animal Science

Impact of parasites on Australian laying hen welfare

Peter J. Groves

Summary: Cage housing systems can prevent the transmission of internal parasites, but production systems with litter or outdoor access may lead to a resurgence of intestinal parasites. Limited availability of effective anthelminthics poses a challenge to the welfare of chickens, especially in organic production systems where no effective treatments can be used.

ANIMAL PRODUCTION SCIENCE (2021)

Review Agriculture, Dairy & Animal Science

Incubation, hatchery practice and the welfare of layer hens

Greg Underwood et al.

Summary: In order for modern layer chickens to achieve optimal production performance and welfare, it is essential to manage the entire production process to reach target bodyweight, body composition, and flock uniformity. Besides genetic improvements, factors such as flock health, environment, nutrition, on-farm practices, incubation, and hatchery practices play a significant role in producing high-quality chicks. Recent advancements in incubation have focused on the benefits of all-in-all-out machines, driven mainly by the meat chicken industry. These improvements, along with advancements in chick transport systems and equipment, contribute to producing healthy and high-quality commercial layer chicks with the potential to reach their genetic capabilities.

ANIMAL PRODUCTION SCIENCE (2021)

Review Agriculture, Dairy & Animal Science

Welfare implications of bacterial and viral infectious diseases for laying hens

Amir H. Noormohammadi

Summary: Understanding the clinical signs and provisional diagnosis of infectious diseases in poultry is crucial for taking immediate action to reduce the impact on bird welfare. This chapter focuses on bacterial and viral diseases of laying hens based on clinical signs and lesions, rather than specific infecting agents, covering conditions such as sudden death, respiratory illness, lameness, and reduced egg production.

ANIMAL PRODUCTION SCIENCE (2021)

Review Agriculture, Dairy & Animal Science

Cage production and laying hen welfare

Paul H. Hemsworth

Summary: This review compares the welfare of laying hens in cage and non-cage systems, highlighting the behavioral restrictions in cage systems and health hygiene issues in non-cage systems. Research suggests that caged hens experience lower stress levels and mortality rates compared to hens in non-cage systems, but their behavioral repertoire is significantly compromised. Environmental enrichment in cage systems, such as furnished cages, can provide positive emotional experiences for hens and enhance their welfare.

ANIMAL PRODUCTION SCIENCE (2021)

Review Agriculture, Dairy & Animal Science

Causes of feather pecking and subsequent welfare issues for the laying hen: a review

Greg M. Cronin et al.

Summary: Feather-pecking behavior in laying hens can lead to severe consequences such as plumage damage, pain, fear, and even cannibalism and death. Research on this issue has been ongoing for over a century, but contradictory findings and multi-factorial causes have made it difficult to reach conclusive results.

ANIMAL PRODUCTION SCIENCE (2021)

Review Agriculture, Dairy & Animal Science

Welfare implications for barn (and aviary) egg production systems

M. Singh et al.

Summary: Barn production systems in Australia provide hens with more freedom of movement compared to cage systems, but may lead to detrimental behaviors such as feather pecking and cannibalism. In comparison to free-range systems, barn systems have advantages in protecting hens from predators and diseases.

ANIMAL PRODUCTION SCIENCE (2021)

Review Agriculture, Dairy & Animal Science

Skeletal health of layers across all housing systems and future research directions for Australia

D. L. M. Campbell

Summary: Modern laying hens have been bred for high egg production, leading to physiological calcium demands that affect their skeletal health. Conventional caged layers often suffer from osteoporosis, while hens in alternative housing systems may face keel bone fractures despite exercise opportunities. Limited research has been done on Australian commercial housing systems regarding hen skeletal health, with international studies showing impaired skeletal health across all housing systems.

ANIMAL PRODUCTION SCIENCE (2021)

Review Agriculture, Dairy & Animal Science

Current methods and techniques of beak trimming laying hens, welfare issues and alternative approaches

Philip C. Glatz et al.

Summary: Beak trimming is used in the egg industry to prevent cannibalism and reduce injurious pecking, with alternatives like infrared beak treatment showing promise in improving welfare. However, concerns remain about sensory input loss and potential pain associated with different trimming methods.

ANIMAL PRODUCTION SCIENCE (2021)

Review Agriculture, Dairy & Animal Science

Free-range egg production: its implications for hen welfare

D. L. M. Campbell et al.

Summary: Through scientific research, it has been found that the majority of laying hens access the range multiple times a day, but a small proportion prefer to remain indoors. Hens exhibit varying preferences in terms of range usage, and the provision of natural or man-made shelters can enhance both range access and distribution. Hens spend most of their time foraging outdoors, with behavior types and frequencies varying based on resources and other factors.

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The Genomic Architecture of Fowl Typhoid Resistance in Commercial Layers

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Andrea Bedford et al.

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Innovative layer genetics to handle global challenges in egg production

Rudolf Preisinger

BRITISH POULTRY SCIENCE (2018)

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Selection for pro-inflammatory mediators produces chickens more resistant to Campylobacter jejuni

C. L. Swaggerty et al.

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Article Agriculture, Dairy & Animal Science

Influence of probiotic supplementation on immune response in broilers raised under hot climate

M. M. Fathi et al.

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Layer breeding programmes in changing production environments: a historic perspective

F. Leenstra et al.

WORLDS POULTRY SCIENCE JOURNAL (2016)

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Influences of Maternal Care on Chicken Welfare

Joanne Edgar et al.

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Article Parasitology

A molecular survey of Eimeria in chickens across Australia

Rosamond M. Godwin et al.

VETERINARY PARASITOLOGY (2015)

Article Agriculture, Dairy & Animal Science

Genetic loci inherited from hens lacking maternal behaviour both inhibit and paradoxically promote this behaviour

Atia Basheer et al.

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Tsuyoshi Miyazaki et al.

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Behavior Genetics and the Domestication of Animals

Per Jensen

ANNUAL REVIEW OF ANIMAL BIOSCIENCES, VOL 2 (2014)

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Nutritional limitations during poultry embryonic development

Z. Uni et al.

JOURNAL OF APPLIED POULTRY RESEARCH (2012)

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Whole-genome resequencing reveals loci under selection during chicken domestication

Carl-Johan Rubin et al.

NATURE (2010)

Article Agriculture, Dairy & Animal Science

Genetic and physiological factors influencing feather pecking in chickens

M. Wysocki et al.

WORLDS POULTRY SCIENCE JOURNAL (2010)

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Selection of Broilers with Improved Innate Immune Responsiveness to Reduce On-Farm Infection by Foodborne Pathogens

Christina L. Swaggerty et al.

FOODBORNE PATHOGENS AND DISEASE (2009)

Article Agriculture, Dairy & Animal Science

Breeding to reduce susceptibility to Escherichia coli in layers

D. Cavero et al.

POULTRY SCIENCE (2009)

Article Biochemical Research Methods

The G protein -: Coupled receptor subset of the chicken genome

Malin C. Lagerstrom et al.

PLOS COMPUTATIONAL BIOLOGY (2006)

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Variance components and selection response for feather-pecking behavior in laying hens

G Su et al.

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Article Agriculture, Dairy & Animal Science

Comparative assessment of bone among wild-type, restricted ovulator and out-of-production hens

WK Kim et al.

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Mapping quantitative trait loci affecting feather pecking behavior and stress response in laying hens

AJ Buitenhuis et al.

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Heritability of feather pecking and open-field response of laying hens at two different ages

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Farm level factors associated with feather pecking in organic laying hens

MWP Bestman et al.

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Behaviour and welfare of individual laying hens in a non-cage system

R Freire et al.

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Development of furnished cages for laying hens

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Feather eating in individually caged hens which differ in their propensity to feather peck

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Spatial distribution and behaviour of laying hens housed in an alternative system

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Divergent selection on feather pecking behaviour in laying hens (Gallus gallus domesticus)

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Working for a dustbath: are hens increasing pleasure rather than reducing suffering?

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Inheritance of bone characteristics affecting osteoporosis in laying hens

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