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The review aimed to review about the benefit of genetic adaptation of farm animals. Gene helps the farm animals to adapt conditions and able to survive in order to supply food sustainably for the fastest growing global human population. Furthermore, farm animal’s genetic adaptation plays a great role to cope up climate change, environmental stresses including extreme hot and cold, disease and parasite and to overcome welfare problems. Accordingly, considering different factors, climatic condition, topography, breed type, relationship with human, disease and parasite resistance, welfare issue, physiological and behavioral status, nutritional habit in harsh environment and management influences, local and cross breeds are more important than exotic breeds to establish an international sustainable farm animal breeding program at farm and laboratory level. Likewise, in-situ and ex-situ adaptive local gene conservation bank should be done properly, especially, in developing countries where their experience is inadequate and local species record at regional level must be realized. Therefore, the importance of this review is unquestionable and must be documented.
Genetic adaptation is a characteristic with a heritable basis that will improve the reproductive and survival traits caused by domestication and natural evolution . Genetic adaptation is of unknot major aim of evolutionary biology . Consequently, genetic selection got an attention to establish breeds which are more adapted, faster growing, productive and better disease and insect infestation resistance to supply food and other livestock products sustainably to human beings in every parts of the world . However, evidence for genetic adaptation in farm animals remains poorly understood .
Additionally, Kantanen et al.  reviewed, the influence of climate challenge for farm animal genetic resource adaptation and conservation soon in human food supply and the alleviation mechanisms. Hoffman et al. [6,7] made clear about the significance of different livestock production systems to be part the food source to mitigate the insecurity problem by conserving diversified animal genetic. However, Unlimited mating, habitat Destruction, unsustainable selective pressures for adaptation to global climate changes, over exploitation and loss of community structure are major threats to conservation of farm animal genetic resources Allendorf and Randi (as cited in Kefyalew
Alemayehu (2013)). Moreover, there have been losing of farm
animal genetic material in some place because of globalization  and many local breeds have a small population mass due to the cause of inability to adapt resulting extinction .
Therefore, the paper aimed to review about the benefit of genetic adaptation of farm animals. It is hoped that the review will help further inform professionals and decision makers whose task is to establish effective farm animals breeding program as a basis for viable expansion of the livestock business.
Animal genetic resources (AnGR) are required to put a solution for world food insecurity challenge especially in in developing countries at livelihood. Livestock provides products with great amount of energy, protein, vitamins and minerals mostly for infants and mothers. Livestock sector supports more than a billion people particularly the rural people which are predominantly poor . The need and completion to use animals and their products have been increasing for the last century significantly and this will be expected to rise. Boettcher et al.  recognized, the domestic animal diversity information system (DAD-IS) prepared by FAO reported about 70% of the world local farm animals’, are recorded cattle, sheep, chicken,
goat and horse, the need of farm animal gene expressed for
adaptation record and in-situ and ex-situ gene conservation
environments (Table 1).
Rothschild , in 35th world animal genomics conference,
reported the world human population will increase rapidly from
7.3 billion to 9.6 billion by 2050 and that food production must
double, despite limitations due to climate change and limited
land and water resources. Therefore, a better understanding
of the underlying genomic control of adaptation in native and
exotic livestock will be required to meet the growing human
needs with keeping the diversity of the genetic resources in
the way to transfer to the next generation. The availability and
cheap animal genomic technologies must come up to benefit
the livestock producers and consumers in the developed world.
However, these tools now need to deliver new opportunities for
the developing world
Functional traits play a critical role in biological and
economic efficiency not by higher outputs of products, but by
reduced costs of production. Consumers demand of farm animal’s
product is growing as a result it needs supply of safe, quality and
low-cost product by giving attention to farm animal welfare. In
this case, to establish effective and efficient breeding program
consideration of functional traits have countless meaning .
The relationships between production and functional traits are
often inacceptable. Further than its economic benefit functional
traits play a role in ethical and consumer concerns in the
breeding program, which are becoming increasingly important.
Adaptation is influenced by genetic make-up and it determines
an animal’s tolerance to adverse conditions such as high
temperature, drought, pests and diseases. Adaptation because
of heritable feature of genes of farm animals favor survival
of a population. Many breeds of the harsh environment have
developed many adaptive traits that increase their survivability
Naskar . The existence and fruitful reproduction of farm
animals which are genetically adapted to a specific environment
is majorly determined by natural selection.
Smallholder pastoralists and their animals repeatedly live
in harsh environments which may be extremely cold or hot.
Moreover, these environments can be characterized by scarce
feed and water resources and high disease pressure with large
seasonal and annual variation of rainfall. In this condition, the
farm animal genes have a potential to allow animals to live under
stressful conditions. The first stragy of breeds will be keep the
environment comfortable by considering the need of animal.
The other alternative is raise locally adapted animals that is very
important for small-scale holders and pastoralists. In the second
case, managing diverse and mixed farm animal enable them to
live, produce and reproduce in their environment under a given
production system Mirkena.
Conserving satisfactory multiplicity of AnGR is necessary
to safeguard adaptation prospective in times of uncertainty to
overcome, the probable climate change problem, which will be a
major force testing elasticity of global food production systems
[15,16]. Adaptation to climate change is improbable to be
accomplished with a single strategy (Hoffmann, 2010). Evidently,
amendments will be needed in animals’ Genetic changes will play
a noteworthy role. Therefore, a significant research commitment
and application of genomics will support the measures taken for
farm animals to be able to coup up the climate change.
So far, many livestock breeds have been genetically
characterized , but the value of this for study of adaptation
is debatable. The best mechanism to tolerate climate change
is rearing local breeds adapted to harsh environments. Most
developed country breeds have been studied for the past many
decades in case climate is managed. Explaining the production
system area to get the required information should be done
by observing geographical features which further needs to
investigate the implication of adaptation , socio-economi evidence  and local breed management information with in
its habitat to gather with climatic documents and soil, vegetation,
and water resources. Therefore, crossbreeding can be a valuable
strategy for achieving increased productivity and adaptability.
Genetic adaptation basically increases productivity,
efficiency and maintenance of genetic diversity which allow for
more opportunities to match breeds to a changing climate in case
wild animal genetic diversity supports selection rather than farm
animals [20-23]. Higher yield and flexible breed in conditions
likely to be prevailing by reason of climate change, such as heat
and drought tolerance and resistance to certain diseases. Several
adaptive genes are involved in cross-talks between processes,
in part through the regulation of transcription. Selection allows
adaptation of functionally diverse loci with high gene flow and
small allel frequency.
The fastest growing world human population demand for
food is becoming beyond the carrying capacity of the land. As a
result, the farm animals’ contribution to fill the food demand gap
is getting an attention and different improvement programs were
established in different parts of the world [24-28]. Accordingly,
Genetic adaptation determines the effectives of production,
behavioral and survival capacity of animals. Especially, natural
selection plays a vital role to get an adapted farm animal gene for
higher output, safe welfare and sustainable utilization without
any detrimental effect through time.
However, evidence for genetic adaptation in farm animals
remains poorly understood which caused quality depletion of
genes. In addition, the global climate change, disease outbreak,
parasite infestation, scares availability of animal forage and water
also become a challenge of farm animal genetic adaptation in
certain portions of the developing nations. Moreover, best locally
fitted animals genetic resource conservation is not as much
working in some areas of the globe. Furthermore, understanding
the genetic adaptation of farm animals, conservation and record
keeping of local breeds have a great role to global food security
that is practiced in developed countries where as it is becoming
a great problem on the other side of the world. Therefore,
Conservation of locally adapted indigenous farm animals breed is
an important objective of sustainable animal breeding program.
From the above conclusions, the following recommendations
are drawn and should be considered while working with genetic
adaptation of farm animals: -
a. Important farm animal adapted genes should be
recorded and conserved.
b. Productive breeds under global climate change which
will mitigate forage scarcity, disease and parasite infestation
should be generated.
c. Trainings, reviews and research should be done
intensively on the topic of farm animal genetic adaptation.