Socially Affected Traits animal breeding socially affected traits , Inheritance and Genetic Improvement

Author(s):  
Piter Bijma
Author(s):  
Anne-Marie Neeteson ◽  
Santiago Avendaño ◽  
Alfons Koerhuis

Abstract Animal breeding for welfare and sustainability requires improving and optimizing environmental impact, productivity, robustness and welfare. Breeding is a long-term exercise at the start of the food chain with permanent cumulative outcomes, disseminated widely. This chapter explains, with a focus on poultry, breeding programme design and how broadening breeding goals and managing trait antagonism results in balanced breeding and more robust animal populations. Breeding progress in skeleton and skin health, physiology and body composition, and behaviour are addressed. The economic impact of welfare and environmental improvements is worked out, and the ethical and societal aspects of genetic improvement are put into perspective. The consideration of feedbacks of all stakeholders, including customers and the wider society, is crucial. For each crossbreed, breeders will continue to improve overall welfare, health, productivity and environmental impact, but between the crossbreeds there will be clear differences answering specific demands of concepts and brands.


2022 ◽  
pp. 317-337
Author(s):  
D.N. Das ◽  
D. Paul ◽  
Sukanta Mondal

1997 ◽  
Vol 26 (4) ◽  
pp. 217-225 ◽  
Author(s):  
Alan Teale

The unique potential of biotechnology to provide new solutions to old problems constraining the contribution of livestock to farming systems in the developing world is emphasized in this paper. An overview of biotechnological aspects of livestock research within the CGIAR, including a description of the research approaches being adopted at the International Livestock Research Institute, is provided. The products of the research are then identified, and their potential applications in disease diagnosis and vaccination, as well as in the fields of animal breeding and genetic improvement, are described.


Author(s):  
M.G.G. Chagunda ◽  
J.P. Gibson ◽  
K. Dzama ◽  
J.E.O Rege

SummaryAnimal breeding for increased productivity over the past 50 to 60 years has been very successful in terms of increasing growth rate, milk yield and egg production in most livestock producing regions of the world (Rauwet al., 1998). However, this success has not registered that well in most countries in sub-Saharan Africa (SSA). Ironically, just like most developing regions, SSA is faced with the challenge to increase rapidly the agricultural productivity to help feed their growing human populations without depleting the natural resource base (Rege, 2005). Genetic improvement of livestock depends on access to genetic variation and effective methods for exploiting this variation (Rege, 2005). This is where human capacity and infrastructure for decision-support systems in animal breeding are required. This paper provides a synthesis of views from a cross-section of livestock production experts working in SSA. These views were collated through an e-conference which was held from 8th March to 20th April 2011. The e-conference discussed future research and development (R&D) needs for animal breeding and genetics in SSA and how they can be met. The e-conference attracted 43 participants from 17 countries. Results from the e-conference demonstrated that the R&D institutions and infrastructure in SSA vary widely in terms of both the physical and human capacity. Equally varied is the level of utilization of these institutions. In terms of training in Animal Breeding and Genetics, although most universities/colleges have programmes in Animal Science and teach animal breeding and genetics, there are very few practicing animal breeders. Lack of mentorship programmes and collaboration, and in some cases lack of appropriate jobs, continue to contribute to this ‘leaking pipeline’ phenomenon. The following is a summary of the consensus stemming from the conference on how the efficiency and effectiveness of livestock genetic improvement in SSA could be enhanced. First, the need to augment the approach that promotes animal breeding and genetics as part of a wider agriculture and rural development system, second, collaboration both within Africa and with those in the Diaspora should be further tapped into and utilized as a source of capacity for R&D and third, initiative of sharing resources and research platforms such as pooling data for genetic analysis from across institutions, and even across countries, should be encouraged in case where this is advantageous to do so.


Author(s):  
J. W. Fuquay

A variety of options are available for improved performance including altering genotype with genetic improvement of indigenous breeds through selective breeding; upgrading through crossbreeding of indigenous females with semen from genetically superior exotic males with a possible goal of developing a new breed; and introduction of new breeds through transfer of embryos from genetically superior exotic breeds into indigenous females or importation of exotic animals of the desired breeding. Each option has its advantages and disadvantages. The most rapid gains mightbe possible new environment can be a problem.  In the interest of adaptation and survival, systems that utilize the maternal influences of indigenous females are advantageous. In consideration of this maternal influences along with rate of improvement and potential for extensive improvement, both crossbreeding programs that use semen from genetically superior exotic males and those that involve transfer of genetically superior embryo survival and neonatal survival will affect management of any option chosen for genetic improvement but should be of less concern in programs that utilize indigenous females.


2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 52-52
Author(s):  
Alison L Van Eenennaam

Abstract It is hard to overstate the important impact that food animal breeding programs have had on decreasing the environmental footprint of animal protein production. Genetic improvement, combined with improved nutritional and animal health programs, have resulted in a significant decrease in the current environmental footprint per unit of animal protein production, as compared to 50 years ago. Accelerated rates of genetic change have been enabled by the adoption of technologies such as artificial insemination and genomic selection. To address projected future animal protein demands using less inputs, animal breeders will need to continue to introduce new breeding methods into food animal breeding programs to further improve the rate of genetic change. Genome editing represents one such technique, offering an approach to precisely knock out undesirable traits, and rapidly introgress useful genetic variants in the absence of linkage drag. Although there is great potential for this technology, it comes following a fractious 30-year debate regarding the use of genetic engineering in food production systems. Additionally, FDA’s proposed regulatory approach to treat all “intentional genome alterations” introduced by genome-editing as new animal drugs, makes it unlikely public sector food animal researchers will be able to afford even basic research and development using genome editing reagents. There is a pressing need for animal geneticists to speak out about the opportunity costs of forestalling safe innovation in animal breeding programs. However, this mandate comes at a time when consumers are questioning the need, or desirability, of applying modern molecular technologies to agricultural production systems. This poses a vexing problem to animal geneticists – is the customer always right?, or are there compelling global food security and environmental reasons to advocate for the use of modern molecular techniques to enable the next inflection point in the rate of genetic improvement in food animal breeding programs.


The opportunities and knowledge required to improve the technology of animal breeding are assessed relative to the baseline of ca. 2 % annual genetic improvement that is possible at present. Present knowledge of the control of reproduction is such that multiple ovulation and embryo transfer (m.o.e.t.) schemes could virtually double the rate of genetic change in species such as cattle where the annual selection intensity is limited by the reproductive rate. There are direct indications from research that new knowledge to facilitate recognition of genetic merit could have a similar impact. Physical techniques such as computerized tomography could aid the assessment of carcass characteristics. Biological knowledge indicates that while biochemical techniques (enzymes or restriction fragment length polymorphism, r.f.l.p.), based on the importance of single alleles may make specific contributions, physiological techniques may have a more general role to play in the recognition of genetic merit. Research in molecular biology points the way to gene transfer, the original genetics of extra specific genes and the production of novel products such as blood clotting factors by domestic animals. Genetic improvement is welfare and ‘Green’ positive; once achieved, it is maintained with no further input but, as a long-term investment, there is the need for a social framework to ensure the application of knowledge to technology.


1986 ◽  
Vol 34 (3) ◽  
pp. 421-426
Author(s):  
R.D. Politiek

This article outlines the scope of research on the genetic improvement of farm livestock in the Netherlands, and briefly describes the main current projects in the breeding of beef and dairy cattle. (Abstract retrieved from CAB Abstracts by CABI’s permission)


Author(s):  
S.P. Simpson

Selection is an important component of animal breeding theory. Directional selection is used extensively in animal breeding programmes as a method of obtaining genetic improvement. Much of the theory used to explain the consequences of selection assumes that the quantitative traits under consideration, eg. leanness or index scores, are under the control of many genes with small effects (polygenes). However, many traits are under the control of both polygenes and a major gene. Conventionally, the expected response to index selection is taken to be R=ih2σp, where σP is the phenotypic standard deviation of the index, h2 its heritability and i the intensity of selection. The intensity of selection is the expected mean of the index scores of the selected animals and has been tabulated by Falconer (1989).


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