Animal genetic resources for food and agriculture (AnGR), also known as farm animal genetic resources or livestock biodiversity, are genetic resources (i.e., genetic material of actual or potential value) of avian and mammalian species, which are used for food and agriculture purposes. AnGR is a subset of and a specific element of agricultural biodiversity.
AnGR could be embodied in live populations or in conserved genetic materials such as cryoconserved semen or embryos. The diversity of animal genetic resources includes diversity at species, breed and within-breed level. Known are currently 8,800 different breeds of birds and mammals within 38 species used for food and agriculture. [1] The main animal species used for food and agriculture production are cattle, sheep, goats, chickens and pigs. In the livestock world, these species are often referred to as "the big five". Some less-utilized species include the dromedary, donkey, bactrian camel, buffalo, guinea pig, horse, rabbit, yak, goose, duck, ostrich, partridge, pheasant, pigeon, and turkey.
The history of animal genetic resources begins about 12,000 to 14,000 years ago. [2] The domestication of major crop and livestock species in the early neolithic time period changed our human evolution and lifestyles. This ability to control food production led to major demographic, technological, political and military changes. Consecutively, thousands of years of natural and human selection, genetic drift, inbreeding, and crossbreeding have contributed to the diversification of animal genetic resources and increased the variety of environments and production systems that livestock keeping takes place. Relatively few species have been domesticated; out of the world's 148 non-carnivorous species weighing more than 45 kg, only 15 have been successfully domesticated. The proportion of domesticated birds used for food and agriculture is even lower- 10 out of 10,000. [3] The reason these numbers are so low is because it is rare to find species with all of the behavioral and physiological traits necessary for domestication. These traits include lack of aggression towards humans, a strong gregarious instinct, a "follow the leader" dominance hierarchy, a tendency not to panic when disturbed, a diet that can be easily supplied by humans (herbivores), a rapid growth rate, relatively short intervals between births, and large litter size. [4]
Besides their initial domestication, dispersion and migration of these domesticated species has had an equally important impact on shaping the composition of livestock diversity. The process of migration likely varied between regions, but certainly involved the movement of human populations and cultural exchanges between populations. In order to look back and determine where livestock domestication occurred, osteometric information from archaeological sites, and ancient livestock DNA studies are useful tools. [5]
Other factors such as mutations, genetic drift and natural and artificial selection have also played a role in shaping the diversity of livestock populations. As animal populations migrated away from their original sites of domestication, sub-populations were formed through geographic and genetic isolation. Interbreeding within these sub-populations between individuals that thrived in the local prevailing environmental conditions (and were thus better able to reproduce) contributed to the formation of distinct groups of animals, known as breeds. This isolation of sub-populations allowed the simultaneous increase in diversification between these sub-populations and increase in uniformity within them. Human intervention through artificial selection of animals with desirable characteristics further increased the differentiation among and uniformity within breeds. Examples of traits that have been deliberately selected by humans include growth rate, milk or egg production, coat color, meat quality, and age of maturity, among many others. The process of artificial selection has been the main reason for gains in output from commercial breeds, whereas the adaptation of indigenous livestock to diverse and challenging environments (natural selection) has been the main factor for their continued survival and production value. Overall, selection, whether it be natural or artificial, generally results in reduced genetic variation. [6]
Over the past 250 years the greatest changes in livestock diversity and creation of formal breeds have occurred mainly due to changes that began in England in the late 18th century. These changes have included development of systematic pedigree and performance recording and applying specific breeding objectives. This led to the fixation of breed-specific traits and an increase in productivity. Some breeds were interbred as distinct, isolated populations, while many breeds continued to interact with each other as a result of intentional cross-breeding or unintended introgression. Before the end of the 19th century, several breeds had been absorbed by other populations. [7] In the 19th century, railways and steamships increased the long-distance transportation of livestock. After the Second World War, artificial insemination became common in cattle and pig breeding. As a result of these developments, a limited number of transboundary commercial breeds, such as the Holstein cow and Large White pig, have become very widespread and nowadays increasingly dominate livestock production globally. [6] Thus, understanding the origins and the history of distribution of livestock are central to maintaining their current utilization and long-term conservation as resources.
The wide number of livestock breeds and the genetic diversity within them mean that animal genetic resources have a substantial value to society. The different breeds provide a wide range of animal products and services for the benefit of humankind. The diversity of animal genetic resources allows livestock to be raised successfully in a diverse range of different environments and underpins the supply of a range of different products and services: from meat, milk and eggs to fuel, manure and draught power.
Diversity also allows the flexibility to change breeding goals if needed and emphasize alternative traits in response to changes in markets or other conditions. For example, the Holstein Friesian Cow, which is widely used for its whole milk production. Changes in cereal feed availability or demand for low-solid-content milk may decrease the advantage of breeding Holstein cows.[ citation needed ]
Different breeds produce specific wool, hairs and leather for clothing, carpets and furniture and are often the basis for traditional garments.[ citation needed ]
Local breeds that were developed by a given community often have a huge cultural significance for that community. Livestock are often a source of wealth and are critical for its maintenance. They appear frequently in art and often play key roles in traditional customs, such as religious ceremonies, sporting events and weddings. Cultural ecosystem services also create significant economic opportunities in fields such as tourism (including, in the context of food and agriculture, farm holidays and visits to areas with historical or scenic farming or forest landscapes) and recreational hunting.[ citation needed ]
Breeds that have been developed primarily through natural selection have effectively evolved with their environments and usually provide ecosystem services, such as landscape management, vegetation control, and promotion of biodiversity, that are critical for maintaining those landscapes. [8] For example, the Engadine sheep, which were near extinction in the 1980s, today help to preserve centuries-old grassland in the Alps by eating invasive shrubs. [9] Grazing livestock also help sequester carbon by removing plant material and encouraging regrowth and thus the movement of carbon from the air into soil organic matter. [10]
Greater livestock diversity allows humans to be better prepared to meet future challenges, such as climate change. Having access to a range of diverse livestock traits may allow for greater ability to cope with harsh climates and emerging diseases. Animals with unique adaptive abilities, such as resistance or tolerance to diseases and pests, or ability to thrive on poor feed and cope with dry or hot climates can help humans be more resilient to changes in climate. Within breeds, greater genetic diversity allows for continued selection for improving a given trait, such as disease resistance.
"From a formal economic perspective, AnGR can have various different types of value for conservation. These values can be categorized as follows
Increasing the direct use value will contribute to the economic sustainability of a breed and therefore to the potential for successful conservation activities." [11] [12]
The Pantaneiro cattle of Brazil are only one example of many at risk of extinction. [13] Despite the importance of animal genetic resources, their diversity has been continually decreasing over time. [14]
"Factors as causes of genetic erosion:
One of the greatest threats to livestock diversity is pressure from large-scale commercial production systems to maintain only high-output breeds. [16] Recent molecular studies have revealed that the diversity of today's indigenous livestock populations greatly exceeds that found in their commercial counterparts. [6]
Climate change and its impact on livestock is being studied. Changes in climate will affect livestock and food production in many ways. [17] [18] In Africa, different regions are predicted to experience different changes in weather patterns. For example, parts of Madagascar and Mozambique are predicted to have a drier than average rainy season, while just north in parts of central Africa, a wetter December–January season is expected. [19]
Some major disease threats that livestock currently face include, rinderpest, foot and mouth disease, and Peste des petits ruminants (PPR), also known as sheep and goat plague.
The Food and Agriculture Organization of the United Nations (FAO) has taken initiative and published two global assessments of livestock biodiversity: The State of the World's Animal Genetic Resources for Food and Agriculture (2007) and The Second Report on the State of the World's Animal Genetic Resources for Food and Agriculture (2015).[ citation needed ]
Although many diverse species and breeds of animals are currently available for food and agricultural production, there is more work to be done on classifying their risk of extinction: in 2014, 17% of the world's farm animal breeds are at risk of extinction and 58% are of unknown risk status, meaning that the problem may be underestimated. The world's pool of animal genetic resources is also currently shrinking, with rapid and uncontrolled loss of breeds and conjointly their often uncharacterized genes. Nearly 100 livestock breeds have gone extinct between 2000 and 2014. [20] With the loss of these breeds comes the loss of their unique adaptive traits, which are often under the control of many different genes and complex interactions between the genotype and the environment. [21] In order to protect these unique traits, and the diversity they allow, collaborative global efforts towards the characterization and management of these genetic resources must be made. Unlike plants, which can be easily conserved in seed banks, a large portion of livestock genetic diversity relies on live populations and their interactions with the environment.[ citation needed ]
Progress is being made in the characterization and management of animal genetic resources for food and agriculture. Recent advances in molecular genetics have provided data on the history and current status of animal genetic resources. Genetic markers and molecular studies are being used to characterize livestock diversity and to reconstruct the events that have shaped the present diversity patterns, including ancestry, prehistoric and historical migrations, admixture, and genetic isolation. [22] Exploration of the past is essential to understand trends and to better characterize the current state of animal genetic resources. In 2009, six years after the completion of the human genome project, cattle became one of the first livestock species to have a fully mapped genome. [23]
Some general conclusions from recent molecular studies show that individual breeds only differ by typically 40% in total genetic molecular composition; species differ by about 80% of their genetic material. Additionally, breeds with well-defined and appreciated traits tend to be inbred and have low genetic diversity, while non-descript local populations tend to have high molecular genetic diversity. [24]
Characterization of animal genetic resources is a prerequisite for its management. Advances in molecular genetics have provided us with tools to better understand livestock origin and diversity. There are many technologies capable of determining genetic profiles, including whole genome sequencing, shotgun sequencing, RNA sequencing and DNA microarray analysis. These techniques allow us to map genomes and then analyze their implications through bioinformatics and statistical analysis. Molecular genetic studies, especially genome-wide association studies and whole-genome sequencing allow adaptive traits to be linked to genomic regions, genes, or even mutations. For example, horn size, meat quality, gait, and prenatal growth in cattle all have single genes found to be responsible for these phenotypic traits. [25]
Specific regions of DNA, such as quantitative trait loci (QTL), include genes affecting observable traits and thus have statistically detectable associations with those traits. However, DNA polymorphisms that are not linked to specific traits are now more commonly used as markers for genetic diversity studies. Different levels of genetic diversity information can be obtained from different kinds of genetic markers. For example, autosomal polymorphisms are used for population diversity estimates, estimation of genetic relationships and population genetic admixture, whereas mitochondrial DNA polymorphisms are used to detect geographic regions of domestication, [26] reconstructing migration routes and the number of female founders. [27] Drawing such inferences is possible because mitochondrial DNA sequences are transferred only through egg cells of the female.[ citation needed ]
Some general conclusions from recent molecular studies show that individual breeds within species show variation at only about 1% of the genome, whereas the variation of genetic material between species is about 80%. Additionally, breeds with well-defined and appreciated traits tend to be inbred and have low genetic diversity, while non-descript local populations tend to have high molecular genetic diversity. [28]
There are many forms of livestock-keeping, that all have their own pros and cons in terms of maintaining genetic diversity. Systems range from completely human-controlled to wild. They differ in terms of animal management, animal treatment, environmental impact, and market infrastructure.[ citation needed ]
For some breeds, opportunities for sustainable use are limited. For such breeds, to ensure that their critical genetic diversity is not lost, conservation programs are required. Several approaches for conservation can be applied, including in situ conservation with live animal populations, and ex situ conservation or cryoconservation involving the freezing of genetic materials. In many instances, both of these approached are used in a complementary manner. In order to establish and strengthen these programs, more research on methods and technologies must be undertaken, especially for less common livestock species, and greater financial investment is required.[ citation needed ]
Many countries are currently operating conservation programs for their animal genetic resources, at least for some species and breeds. In situ conservation programs are the most commonly used approach. [1]
The management of issues regarding animal genetic resources on the global level is addressed by the Commission on Genetic Resources for Food and Agriculture (CGRFA), which is a body of FAO. In May 1997, The CGRFA established an Intergovernmental Technical Working Group on Animal Genetic Resources for Food and Agriculture (ITWG-AnGR). [31] The ITWG-AnGR's objectives are to review the situation and issues related to agrobiodiversity of animal genetic resources for food and agriculture. With this knowledge it can make recommendations and advise the Commission on these matters, and consider progress resulting from proposed interventions. [32] This group worked with many partners and countries to produce the First Report on the State of Animal Genetic Resources, which served as the basis for creating the Global Plan of Action for Animal Genetic Resources (GPA). In 2007, the GPA was adopted by 109 countries as the first agreed international framework for the management of livestock biodiversity. [33] The implementation of the GPA is overseen, monitored and evaluated by the CGRFA. The funding for this program arrives from a wide range of actors, under the guidelines of the Funding Strategy for the Implementation of the Global Plan of Action for Animal Genetic Resources. [34]
The access and benefit sharing of animal genetic resources are currently regulated by the Nagoya Protocol on Access and Benefit sharing, which is an agreement to the 1992 Convention on Biological Diversity. The Nagoya Protocol entered into force on 12 October 2014 and aims to provide a legal framework for the fair and equitable distribution of benefits arising from the utilization of all genetic resources, including animal genetic resources for food and agriculture. [35] This protocol may have both positive and negative impacts on the exchange of animal genetic resources between signatory countries.
Within the Agenda 2030 for Sustainable Development, AnGR are addressed under the target 2.5: "By 2020, maintain the genetic diversity of seeds, cultivated plants and farmed and domesticated animals and their related wild species, including through soundly managed and diversified seed and plant banks at the national, regional and international levels, and promote access to and fair and equitable sharing of benefits arising from the utilization of genetic resources and associated traditional knowledge, as internationally agreed." [36]
Which is monitored by the following indicators:
"2.5.1: Number of plant and animal genetic resources for food and agriculture secured in either medium or long term conservation facilities.
2.5.2: Proportion of local breeds, classified as being at risk, not at risk or unknown level of risk of extinction." [37]
Although policies can have some negative consequences, they are nonetheless important. Lack of adequate policies can lead to the insufficient capacity to manage AnGRs, further a loss of genetic diversity and marginalization of relevant stakeholders, such as pastoralists, who are valuable players in maintaining livestock diversity.
To help regulate the ownership of genetic resources and control their utilization is one example where policies are necessary. Patenting of genetic resources is one approach that has been applied. Patenting of animal genetic resources reached its apex in the late 1990s, focusing on expressed sequence tags (ESTs) and single nucleotide polymorphisms (SNPs) with associations in economically important traits. SNPs are important in marker-assisted breeding for the identification of traits such as meat or milk quality. At the same time, patenting activity involving transgenic livestock also increased. However, work on patents and characterization of AnGR declined sharply from 2001, caused by a combination of factors including an increasingly restrictive approach to the patentability of DNA sequences by patent offices and a lack of markets for food products from transgenic animals. [38] Trends in activity arising from genome sequencing projects merit careful attention with regard to their implications (positive or negative) for animal genetic resources management.
Increasingly complex issues are emerging that require balancing the interests of many stakeholders. In a time of rapid and unregulated change, livestock and their products should be used sustainably, developed and ultimately conserved. National planning should integrate "consumer affairs, human health matters, and the management of new biotechnologies, as well as physical and spatial planning of animal production in the context of urban expansion and protected areas." [33]
There are many online databases for policies, national laws, treaties and regulations on food, agriculture and renewable natural resources, including animal genetic resources. FAOLEX is one of the largest online databases, and is run by FAO.
Agriculture encompasses crop and livestock production, aquaculture, and forestry for food and non-food products. Agriculture was a key factor in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to live in cities. While humans started gathering grains at least 105,000 years ago, nascent farmers only began planting them around 11,500 years ago. Sheep, goats, pigs, and cattle were domesticated around 10,000 years ago. Plants were independently cultivated in at least 11 regions of the world. In the 20th century, industrial agriculture based on large-scale monocultures came to dominate agricultural output.
Ex situ conservation is the process of protecting an endangered species, variety, or breed of plant or animal outside its natural habitat. For example, by removing part of the population from a threatened habitat and placing it in a new location, an artificial environment which is similar to the natural habitat of the respective animal and within the care of humans, such as a zoological park or wildlife sanctuary. The degree to which humans control or modify the natural dynamics of the managed population varies widely, and this may include alteration of living environments, reproductive patterns, access to resources, and protection from predation and mortality.
A breed is a specific group of breedable domestic animals having homogeneous appearance (phenotype), homogeneous behavior, and/or other characteristics that distinguish it from other organisms of the same species. In literature, there exist several slightly deviating definitions. Breeds are formed through genetic isolation and either natural adaptation to the environment or selective breeding, or a combination of the two. Despite the centrality of the idea of "breeds" to animal husbandry and agriculture, no single, scientifically accepted definition of the term exists. A breed is therefore not an objective or biologically verifiable classification but is instead a term of art amongst groups of breeders who share a consensus around what qualities make some members of a given species members of a nameable subset.
Genetic diversity is the total number of genetic characteristics in the genetic makeup of a species. It ranges widely, from the number of species to differences within species, and can be correlated to the span of survival for a species. It is distinguished from genetic variability, which describes the tendency of genetic characteristics to vary.
Pastoralism is a form of animal husbandry where domesticated animals are released onto large vegetated outdoor lands (pastures) for grazing, historically by nomadic people who moved around with their herds. The animal species involved include cattle, camels, goats, yaks, llamas, reindeer, horses, and sheep.
A landrace is a domesticated, locally adapted, often traditional variety of a species of animal or plant that has developed over time, through adaptation to its natural and cultural environment of agriculture and pastoralism, and due to isolation from other populations of the species. Landraces are distinct from cultivars and from standard breeds.
Agricultural biodiversity or agrobiodiversity is a subset of general biodiversity pertaining to agriculture. It can be defined as "the variety and variability of animals, plants and micro-organisms at the genetic, species and ecosystem levels that sustain the ecosystem structures, functions and processes in and around production systems, and that provide food and non-food agricultural products.” It is managed by farmers, pastoralists, fishers and forest dwellers, agrobiodiversity provides stability, adaptability and resilience and constitutes a key element of the livelihood strategies of rural communities throughout the world. Agrobiodiversity is central to sustainable food systems and sustainable diets. The use of agricultural biodiversity can contribute to food security, nutrition security, and livelihood security, and it is critical for climate adaptation and climate mitigation.
Animal breeding is a branch of animal science that addresses the evaluation of the genetic value of livestock. Selecting for breeding animals with superior EBV in growth rate, egg, meat, milk, or wool production, or with other desirable traits has revolutionized livestock production throughout the entire world. The scientific theory of animal breeding incorporates population genetics, quantitative genetics, statistics, and recently molecular genetics and is based on the pioneering work of Sewall Wright, Jay Lush, and Charles Henderson.
Kalmyk cattle is a breed of beef cattle of the former Soviet Union, now found in the Russian Federation, in Kazakhstan and in Tajikistan. It is believed to have originated in Dzungaria, and to have been brought into south-eastern Russia by migrating Kalmyks in the seventeenth century.
The Ukrainian Grey is an ancient Ukrainian breed of Podolian cattle. It is a hardy breed, and was traditionally used both for meat and for draught power. It is similar to other European steppe cattle breeds such as the Hungarian Grey and the Italian Podolica.
The Unmol is a rare breed of horse from the north-western Punjab, in Pakistan. In 1995, its conservation status was listed by the FAO as "critical" and the breed was described as "nearly extinct". The subsequent (third) edition of the World Watch List for Domestic Animal Diversity, published in 2000, does not mention it; it also was not among the breeds listed in the Global Databank for Animal Genetic Resources in 2007. Unmol horses are or were usually bay or grey. There are, or were, a small number in India.
In modern agriculture, a rare breed is a breed of poultry or livestock that has a very small breeding population, usually from a few hundred to a few thousand. Because of their small numbers, rare breeds may have a threatened conservation status, and they may be protected under regional laws. Many countries have organizations devoted to the protection and promotion of rare breeds, for which they each have their own definition. In botany and horticulture, the parallel to rare animal breeds are heirloom plants, which are rare cultivars.
The Sahelian is an African breed or group of breeds of domestic goat. It is used to produce meat, goatskin and milk. It is distributed in twelve African countries, principally in the Sahel region from which the name derives, but also in other parts of Africa – in the Central African Republic, Ghana, Somalia and Togo; it is also present in Iran. The largest population is reported from Mali, where in 2015 there were about 35 million head, or about 75% of the total population of almost 48 million.
The Jaca Navarra, or Navarrese Horse, is a Spanish breed of small horse from the autonomous community of Navarre in the north-eastern part of the country. In 2013 it was listed in the Catálogo Oficial de Razas de Ganado de España in the group of autochthonous breeds in danger of extinction. The total population of the Jaca Navarra has been variously estimated at 350, 250, and 240 and decreasing. In April 2011 the total population was reported to be 899, all of which were in Navarre. In 2000, and again in 2007, it was listed by the FAO as endangered.
DAD-IS is the acronym for Domestic Animal Diversity Information System, which is a tool developed and maintained by the Food and Agriculture Organization of the United Nations. It is part of FAO's programme on management of animal genetic resources for food and agriculture. It includes a searchable database of animal breed-related information.
Livestock Keepers' Rights are a bundle of rights that would support the survival of small-scale livestock keepers such as pastoralists, smallholders and family farms in a general policy environment that favours large-scale industrial modes of livestock production. In the context of the current anti-livestock agenda and the claim by commercial interests that livestock will be eliminated by 2035, they are gaining added traction.
Yakutian cattle, Саха ынаҕа in the Sakha language, are a cattle landrace bred north of the Arctic Circle in the Republic of Sakha. They are noted for their extreme hardiness and tolerance towards freezing temperatures.
Cryoconservation of animal genetic resources is a strategy wherein samples of animal genetic materials are preserved cryogenically.
The State of the World's Animal Genetic Resources for Food and Agriculture is a major report on the genetic resources of breeds of farm livestock in the world. It was published by the Food and Agriculture Organization of the United Nations (FAO) in 2007. It covers mammalian and avian domestic livestock breeds, but does not include fish or honey bees and other invertebrates. It is based on information submitted to the FAO, in the form of reports of participating countries, thematic studies prepared by experts and data on individual breeds submitted to DAD-IS. An annex to the report, the List of breeds documented in the Global Databank for Animal Genetic Resources, gives an estimate of conservation status for all breeds for which sufficient data had been received. The report has been translated into Arabic, Chinese, French, Indonesian, Russian and Spanish.
The Lavradeiro or Wild Horse of Roraima is a Brazilian breed or population of feral horses of Colonial Spanish type in the state of Roraima, in northern Brazil. The name derives from the lavrado or savannah terrain in that region.
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