Layer breeding programmes in changing production environments: a historic perspective

@article{Leenstra2016LayerBP,
  title={Layer breeding programmes in changing production environments: a historic perspective},
  author={Ferry Leenstra and Jan ten Napel and J. Visscher and F van Sambeek},
  journal={World's Poultry Science Journal},
  year={2016},
  volume={72},
  pages={21 - 36}
}
The housing and management of laying hens and their productivity has gone through enormous developments in the last century. Housing has changed from free-range systems, via battery cages to a variety of loose housing and different types of battery cages, and back to outdoor access systems. Although battery cages are still the main system used worldwide, the number of hens housed in aviaries and free-range systems has increased in Europe, Australasia and some parts of the USA, but aviaries and… Expand
THE INFLUENCE OF REARING SYSTEM FOR LAYING HENS ON THEIR HEALTH STATE
Civic associations succeed to change the legislation regarding rearing of laying hens. Phenomenon lead to adaptation of some technological solutions which offer birds those life conditions specificExpand
Advances in genetic selection and breeder practice improve commercial layer hen welfare
TLDR
The present paper reviews the modern approaches to genetic selection, including considerations of and benefits to the welfare state of commercial layers, as well as providing the primary breeding companies with improved and broader basis of selection of the modern commercial layer breeds. Expand
Performance and cost-benefit analysis of Isa Brown layers on different management systems
TLDR
It was concluded that free range management system resulted into better profit margin and could however be adopted by small scale farmers in rural areas willing to practice backyard poultry farming. Expand
Improving feed efficiency in fish using selective breeding: a review
TLDR
Past work to improve feed efficiency in fish using selective breeding is reviewed, indirect selection criteria that could be used to improve FE (including growth after starvation/refeeding, body composition, neuropeptides or hormone levels) are discussed and promising approaches to measuring feed intake accurately are identified. Expand
Revealing the structure of the associations between housing system, facilities, management and welfare of commercial laying hens using Additive Bayesian Networks.
TLDR
An overview of the current welfare status of commercial layer flocks in Sweden is provided and the complexity of welfare aspects is explored by investigating and interpreting the inter-relationships between housing system, production type, facilities, management and animal welfare indicators. Expand
SPECIALTY POULTRY PRODUCTION: IMPACT OF GENOTYPE, FEED STRATEGIES, ALTERNATIVE FEEDSTUFFS, AND DIETARY ENZYMES ON THE GROWTH PERFORMANCE AND CARCASS CHARACTERISTICS OF HERITAGE BREED CHICKENS
TLDR
The findings of these studies could help producers interested in raising slowgrowing meat-type chickens and heritage breeds create accurate business plans and determine if they can profitably produce meat and/or eggs for niche markets. Expand
Albumen Quality of Fresh and Stored Table Eggs: Hen Genotype as a Further Chance for Consumer Choice
  • C. Rizzi
  • Medicine
  • Animals : an open access journal from MDPI
  • 2021
TLDR
Egg production and quality of the eggshell and albumen in fresh and stored eggs of two Italian dual-purpose purebreds and two hybrid genotypes reared outdoors were compared and RM showed a quite stable albumen quality and a lower total egg mass than ER which showed a more variable albumenquality, due also to a lower eggshell thickness and shape index. Expand
Effect of housing environment on laying hen meat quality: Assessing Pectoralis major pH, colour and tenderness in three strains of 80–81 week-old layers housed in conventional and furnished cages
TLDR
Lack of housing differences suggests that environmental stressors present in both housing systems similarly affected meat quality, and strain differences for muscle pH, a* and SF indicate increased stress experienced by SH and LL hens. Expand
Genotypic and Dietary Effects on Egg Quality of Local Chicken Breeds and Their Crosses Fed with Faba Beans
TLDR
The effect of faba beans as a substitute for soybeans in the diet of chickens originating from traditional low-performance breeds in comparison with high-performing laying type hens and their crosses on egg quality parameters was evaluated. Expand
The effect of feed structure on gastrointestinal tract traits and performance in laying hens: an overview of 70 years’ experience
TLDR
The following review provides an overview of data from seven decades regarding the implications of feed structure on the physiology, histology, metabolism and development of the gut and the performance of egg-laying chickens. Expand
...
1
2
...

References

SHOWING 1-10 OF 57 REFERENCES
Genetic analysis of production, immunity and behaviour in laying hens.
TLDR
In Chapters 2 and 3 of this thesis it is described how to use pooled records for the estimation of heritability and breeding values, and how to estimate genetic and phenotypic correlations from pooled data. Expand
Research on alternatives to the battery system for laying hens
Abstract Poultry-keeping nowadays is carried out in all parts of the world. That means that we are all responsible for the implementation of a suitable form of husbandry designed in the light ofExpand
Laying hen performance in different production systems; why do they differ and how to close the gap? Results of discussions with groups of farmers in The Netherlands, Switzerland and France, benchmarking and model calculations
Free range and organic systems expose the laying hen more to unexpected events and adverse climatic conditions than barn and cage systems. In France, The Netherlands and Switzerland the requirementsExpand
Production performance and egg quality of four strains of laying hens kept in conventional cages and floor pens.
TLDR
This study suggests that genotype x environment interactions should be considered when alternative housing systems are proposed, and significant strain differences were found for the use of nest-boxes, with a high percentage of floor eggs for brown egg strains. Expand
Minimizing losses in poultry breeding and production: how breeding companies contribute to poultry welfare
TLDR
Current focus is on components of liveability which are directly or indirectly linked to poultry welfare: selection against feather pecking and cannibalism in egg-type chickens and selection against leg disorders and heart/lung dysfunction in rapidly growing meat poultry. Expand
Hen welfare in different housing systems.
TLDR
It appears that no single housing system is ideal from a hen welfare perspective and any attempt to evaluate the sustainability of a switch to an alternative housing system requires careful consideration of the merits and shortcomings of each housing system. Expand
Performance of commercial laying hen genotypes on free range and organic farms in Switzerland, France and The Netherlands
TLDR
The overall effect of system on egg production and mortality was significant, with higher mortality and lower egg production among organic hens and conventional hens, and in pair wise comparisons within country, the difference was highly significant in The Netherlands and showed a non-significant tendency in the same direction in Switzerland. Expand
New phenotypes for new breeding goals in layers
TLDR
The laying performance tested with the Funnel Nest Box (FNB) show differences to the recorded egg number of full sibs which have been tested in cages, andabled genetic parameters showed low correlations for the egg number at peak production which could be explained by genotype x environment effects. Expand
Feeding layers of different genotypes in organic feed environments
TLDR
D diets low in methionine content influenced predominantly plumage condition and egg weight, although production of eggs by number was unaffected, and the SH hen adapted well to organic conditions, as did the Hyline genotype. Expand
Genetic analysis of feather pecking behavior in laying hens
TLDR
The QTL for severe FP and gentle FP offer the possibility to identify genetic markers for FP behavior, which may be used in genetic improvement programs, as well as for receiving pecks and open-field behavior. Expand
...
1
2
3
4
5
...