Claire Thompson
Artificial selection in chickens has been used to benefit humans in a variety of ways. Chickens were domesticated from the wild red jungle fowl, and artificial selection has allowed humans to select the best animals with the highest survivability and reproducibility. This has resulted in higher egg and meat production, improved energy efficiency, and faster growth rates. For example, a laying hen can produce more than 300 eggs a year, whereas a jungle fowl lays 4 to 6 eggs annually. Artificial selection has also improved chicken welfare, with modern breeding programs focusing on high production efficiency and optimal welfare through resistance to stress, disease, or both. Furthermore, artificial selection signals in the chicken genome have been studied to identify economically important traits and improve goal-directed economic traits. However, it is important to note that artificial selection for improved energy efficiency in broiler chickens may be reaching its limits due to biological constraints and animal welfare concerns.
| Characteristics | Values |
|---|---|
| Number of eggs laid per year | Laying hens produce 300+ eggs per year, whereas jungle fowl lay 4-6 eggs per year |
| Speed | Artificial selection is faster than natural selection and produces more visible results in a shorter time |
| Energy efficiency | Artificial selection has improved energy efficiency, but is reaching its limits |
| Growth rate | Artificial selection has increased growth rates, allowing birds to reach slaughter weight earlier and reducing resource use |
| Feed consumption | Improved energy efficiency has reduced feed consumption and improved environmental sustainability |
| Welfare | Artificial selection can improve chicken welfare through resistance to stress, disease, or both |
| Genes | Artificial selection has identified signals from 3 putative genes (PTHLH, OVST and SCNN1A) related to eggshell characteristics |
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What You'll Learn
- Artificial selection of chickens can improve their energy efficiency, reducing environmental impact
- Artificial selection can increase egg productivity, benefiting human nutrition
- Artificial selection can improve chicken welfare, increasing survivability
- Artificial selection can improve chicken adaptability, allowing them to thrive in diverse environments
- Artificial selection can enhance disease resistance in chickens, reducing health risks
Artificial selection of chickens can improve their energy efficiency, reducing environmental impact
Artificial selection of chickens has been a major success in animal husbandry, resulting in efficient resource utilisation and environmental sustainability. This process, driven by human needs, has led to increased energy efficiency in chickens, reducing the environmental impact of chicken meat production.
Chickens have been selectively bred to increase their growth rate, allowing them to reach their slaughter weight earlier. This shorter growth cycle requires less energy to maintain body functions, reducing the overall resource use of the bird. As a result, artificial selection has led to decreased feed consumption in chickens, improving the environmental sustainability of meat production. With less feed required, the energy needed for powering feed dispensers is also reduced.
Additionally, artificial selection has contributed to the adaptability of chickens. Chickens have retained their ability to adapt to their housing environments, often through genetic changes occurring with each new generation. This adaptability further reduces the environmental impact of chicken production by allowing chickens to better utilise resources and withstand stressors.
While artificial selection has improved energy efficiency in chickens, it is important to recognise that there are biological limits and animal welfare concerns that may hinder further significant improvements. For example, slower-growing birds, which may be favoured for improved welfare, can increase environmental burdens compared to current birds. Nevertheless, advancements in genetic understanding and alternative breeding strategies can be explored to optimise the sustainability of chicken production.
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Artificial selection can increase egg productivity, benefiting human nutrition
Artificial selection in chickens is a human-driven process that aims to rapidly achieve specific goals, such as increasing egg productivity, by selecting individuals with desired traits for reproduction. This process has significantly increased egg production in laying hens, with modern breeds producing more than 300 eggs annually compared to the 4-6 eggs laid by their wild jungle fowl ancestors.
Artificial selection has been instrumental in shaping economically important traits in chickens, including egg-laying abilities. By selectively breeding chickens with desired characteristics, humans have been able to create specialized breeds that excel in egg production. This practice has contributed to the development of modern chicken breeding programs, which aim to optimize both production efficiency and animal welfare.
One key aspect of artificial selection in chickens is the identification of specific genes associated with desirable traits. For example, studies have identified three genes (PTHLH, OVST, and SCNN1A) that play crucial roles in eggshell characteristics and calcium regulation. The PTHLH gene is involved in calcium transportation, while the OVST gene regulates eggshell matrix protein secretion during oviduct development. By targeting these genes through artificial selection, breeders can enhance egg productivity and improve eggshell quality.
Additionally, artificial selection has contributed to the evolution of calcium transportation systems in layer chickens. High egg productivity requires efficient calcium transportation, and artificial selection has likely played a role in enhancing this system. This is particularly important as calcium is essential for eggshell formation and maintaining the health of laying hens.
Overall, artificial selection has been instrumental in increasing egg productivity in chickens, benefiting human nutrition by providing a more abundant and reliable source of eggs. By selectively breeding chickens with desired traits, humans have successfully developed specialized breeds that excel in egg production, contributing to both economic gains and improved nutritional availability.
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Artificial selection can improve chicken welfare, increasing survivability
Artificial selection in chickens can improve their welfare and increase their survivability. Chickens have the ability to change their behaviour and physiology based on the costs and benefits to fit their environment. Artificial selection, which is driven by human needs, can act on these changes to rapidly produce birds with improved welfare and survivability.
Chickens were domesticated from the wild red jungle fowl, and the principle of their domestication is similar to that of natural selection: selecting the best animals with the highest survivability and reproducibility. During the domestication process, chickens retained their ability to adapt to their housing environments, which is usually achieved by genetic changes occurring with each subsequent generation.
Genes control the behavioural, physiological, immunological, and psychological responses of chickens to stressors, including environmental stimulations. With advances in understanding the genetic mediation of chicken physiology and behaviour, and the discovery of the genome sequences of many species, artificial selection can be used to improve the speed and success of chicken breeding programs.
For example, artificial selection can be used to improve the energy efficiency of chickens, which has the potential to reduce the environmental impact of chicken meat production. By selecting for faster growth rates, birds can reach their slaughter weight earlier, reducing the resources needed to maintain their body functions and decreasing the feed consumption required.
Additionally, artificial selection can improve chicken welfare by selecting for traits that increase stress resistance and disease resistance. This can lead to higher survivability rates and improved overall welfare for the chickens.
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Artificial selection can improve chicken adaptability, allowing them to thrive in diverse environments
Artificial selection in chickens can be used to improve their adaptability, allowing them to thrive in diverse environments. This process is driven by human needs and has more rapid and visible results than natural selection. By selecting chickens with specific traits that enhance their ability to survive and reproduce in certain environments, humans can accelerate the adaptation process.
Chickens have the ability to change their behaviour and physiology through behavioural and physiological plasticity. This allows them to adapt to their housing environments, which can be facilitated by artificial selection. For example, a laying hen selected for domestication can produce more than 300 eggs a year, compared to the 4 to 6 eggs laid by a jungle fowl in the wild.
Genes control the behavioural, physiological, immunological, and psychological responses of chickens to stressors, including environmental stimuli. Through artificial selection, humans can influence the expression of these genes, promoting traits that enhance the chicken's adaptability. For instance, the PTHLH gene, which regulates calcium, can be targeted to improve egg productivity and the evolution of the calcium transportation system.
Artificial selection can also improve chicken adaptability by increasing their resistance to stress and disease. Modern chicken breeding programs aim to optimize chicken welfare by selecting for traits that enhance their ability to withstand stressful conditions and diseases. This not only improves the chicken's chances of survival but also contributes to their overall well-being.
Additionally, artificial selection can be used to identify and promote economically important traits in chickens. By employing statistical methods and studying the chicken genome, humans can detect signals of artificial selection and further shape traits that have economic value. This includes traits related to egg production, such as eggshell characteristics, as well as other commercial traits that are advantageous for human use.
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Artificial selection can enhance disease resistance in chickens, reducing health risks
Artificial selection in chickens can be used to enhance disease resistance, which in turn reduces health risks and brings many benefits to humans. Artificial selection is a human-driven process that acts more rapidly than natural selection, with visible results over a short time period. By selecting chickens with favourable health traits, such as disease resistance, humans can improve the overall health and welfare of chicken populations.
Disease-resistant chickens can prevent the entry of pathogens or inhibit their replication, reducing the need for costly medicine treatments. This also eliminates economic losses caused by diseases, such as reduced production, high mortality, and low fertility. For example, Marek's disease in poultry has been shown to stimulate egg-laying, benefiting egg production. Additionally, as infectious organisms evolve resistance to drugs and vaccines, selecting for disease resistance in chickens becomes an increasingly attractive strategy.
Artificial selection can also be used to identify and select chickens with specific immunity genes that enhance their resistivity to certain diseases. For instance, the BCL2L14 and CDH13 genes have been identified as mediators of apoptosis and enhancers of immune resistivity to Campylobacter jejuni, respectively. By selecting chickens with these favourable immunity genes, humans can improve the overall disease resistance of chicken populations.
However, it is important to note that artificial selection for productivity traits in broiler chickens has been shown to negatively impact their resistance to infectious diseases. This highlights the importance of balancing productivity and health traits in artificial selection programs to ensure the overall welfare of the chicken population and reduce potential health risks.
In conclusion, artificial selection in chickens can be a powerful tool for enhancing disease resistance and reducing health risks. By selecting chickens with favourable health traits and specific immunity genes, humans can improve the overall health and productivity of chicken populations, benefiting both chicken welfare and human needs.
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Frequently asked questions
Artificial selection is a human-driven process of selecting the best animals with the highest survivability and reproducibility, which acts more rapidly with more visible results over a short time period compared to natural selection.
Artificial selection of chickens has resulted in improved energy efficiency and faster growth rates, leading to reduced resource use and improved environmental sustainability of chicken meat production. Additionally, it has contributed to higher egg productivity and improved chicken welfare through stress and disease resistance.
Artificial selection in chickens has led to the identification of genes related to eggshell characteristics and calcium regulation, as well as signals influencing egg production and bird weight. It has also resulted in the development of modern broiler chickens, which have improved resource utilisation and sustainability.
Natural selection is a slow and constant process, working over multiple generations. In contrast, artificial selection is faster and more focused on immediate human needs. For example, a laying hen selected through artificial selection can produce over 300 eggs a year, while a jungle fowl lays 4 to 6 eggs annually through natural selection.
Artificial selection for improved energy efficiency in broiler chickens is reaching its limits due to biological constraints and animal welfare concerns. It may be challenging to further improve bird energy efficiency without compromising bird activity levels.
