I compiled this post after so many questions been asked about the types of breed of pigs that are reared in Nigeria, so here are some breeds .........................
The Large White, also known as the English Large White, is a breed of domestic pig originating in Yorkshire, hence also known as the Yorkshire pig. First recognized in 1868, the breed is the progenitor of the American Yorkshire (or simply Yorkshire) in North America.
[1] The Large White is one of the most numerous of all pig breeds, widely used in crossbreeding for intensive pig farming around the world.
[2] True to its name the breed is a big white-skinned pig, with erect ears and a dished face. It was originally developed as an outdoor breed, but today it is one of those favored by commercial pig breeders, lending uniformity to pigs produced for meat on a large scale.
[3]

The American Landrace is a medium to large breed of domestic pig, white in colour, with long bodies, fine hair, long snouts, and heavy, drooping ears. They are bred for pork production. The American Landrace derives from the Danish Landrace of 1895 Danish origin. In the early 1930s, the United States Department of Agriculture (USDA) entered into an agreement with the Ministry of Foreign Affairs in Denmark for the purchase of 24 Danish Landrace to be used for swine research studies, with the stipulation that they would not be commercially propagated as a pure breed. Landrace were subsequently used in numerous comparisons with American breeds. In 1949, upon USDA petition, Denmark released the United States from its breeding restrictions. The American Landrace Association was formed in 1950, and the American Landrace breed was established from outcrosses with Norwegian and Swedish breeding stock.

the duroc pig, In 1812, early "Red Hogs" were bred in New York and New Jersey. They were large in size. Large litters and the ability to grow quickly were characteristics Durocs possessed from the beginning. The foundation that formed today's "Duroc" was comprised of Red Durocs from New York and Jersey Reds from New Jersey.
In 1823, Isaac Frink of Milton in Saratoga County, New York, obtained from Harry Kelsey of Florida New York, a red boar, one of a litter of ten pigs. The sire and dam of these pigs were probably imported from England. Kelsey owned a famous trotting stallion named Duroc, so Frink named his red boar in honour of the horse. This boar was known for his smoothness and carcase quality.
His progeny continued the Duroc name and many of them inherited his colour, quick growth and maturity, deep body, broad ham and shoulder, and quiet disposition. The Duroc was smaller than the Jersey Red, with finer bones and better carcase quality. Beginning in the early 1860s, Durocs were made from a systematic blending of the two very different strains.
The first organization for the purpose of recording, improving, and promoting Red Hogs was the American Duroc-Jersey Association, which was established in 1883. At the 1893 Chicago World's Fair, Durocs gained wide popularity at the first successful Duroc Hog Show.
The Duroc made two attempts to gain a foothold in this country; the first in the early 70s was not very successful, although some of those pigs were exported on to Denmark. They were re- imported in the early 80s and a comprehensive trial was undertaken by the MLC to assess the merits of the Duroc as a terminal sire. It was found that in the British skin-on fresh pork market the Duroc could not be used as a purebred but only as component of a crossbred boar. The development of Duroc crossbred boars produced large numbers of crossbred gilts. A market was found for these due to a resurgence of interest in outdoor pig production. This has resulted in breeding and selection programmes for the British Duroc focusing on female line characteristics rather than the traditional terminal sire traits associated with the breed. The Duroc has now found a special niche in the British industry and a unique British version of the breed has been developed.
Their thick auburn winter coat and hard skin allows them to survive the cold and wet of the British winter. This coat moults out in summer to leave the pig looking almost bald, but as a consequence it can cope with hot dry summers equally well. All purebred Durocs are red in colour and the development of a so-called “White Duroc” has only been achieved by crossbreeding with a white breed.
Its tenacity in looking after its young combined with its docility between times makes it an ideal candidate for an outdoor pig, either as a dam or sire line, and its succulence and heavy muscling makes it very suitable for anything from light pork to heavy hog production.
Further research funded by the MLC has investigated the Duroc’s claim to produce high levels of tenderness. This has led to a recommendation to include Duroc genetics as part of the meat quality Blueprint.

The Large White, also known as the English Large White, is a breed of domestic pig originating in Yorkshire, hence also known as the Yorkshire pig. First recognized in 1868, the breed is the progenitor of the American Yorkshire (or simply Yorkshire) in North America.
[1] The Large White is one of the most numerous of all pig breeds, widely used in crossbreeding for intensive pig farming around the world.
[2] True to its name the breed is a big white-skinned pig, with erect ears and a dished face. It was originally developed as an outdoor breed, but today it is one of those favored by commercial pig breeders, lending uniformity to pigs produced for meat on a large scale.
[3]

The American Landrace is a medium to large breed of domestic pig, white in colour, with long bodies, fine hair, long snouts, and heavy, drooping ears. They are bred for pork production. The American Landrace derives from the Danish Landrace of 1895 Danish origin. In the early 1930s, the United States Department of Agriculture (USDA) entered into an agreement with the Ministry of Foreign Affairs in Denmark for the purchase of 24 Danish Landrace to be used for swine research studies, with the stipulation that they would not be commercially propagated as a pure breed. Landrace were subsequently used in numerous comparisons with American breeds. In 1949, upon USDA petition, Denmark released the United States from its breeding restrictions. The American Landrace Association was formed in 1950, and the American Landrace breed was established from outcrosses with Norwegian and Swedish breeding stock.

the duroc pig, In 1812, early "Red Hogs" were bred in New York and New Jersey. They were large in size. Large litters and the ability to grow quickly were characteristics Durocs possessed from the beginning. The foundation that formed today's "Duroc" was comprised of Red Durocs from New York and Jersey Reds from New Jersey.
In 1823, Isaac Frink of Milton in Saratoga County, New York, obtained from Harry Kelsey of Florida New York, a red boar, one of a litter of ten pigs. The sire and dam of these pigs were probably imported from England. Kelsey owned a famous trotting stallion named Duroc, so Frink named his red boar in honour of the horse. This boar was known for his smoothness and carcase quality.
His progeny continued the Duroc name and many of them inherited his colour, quick growth and maturity, deep body, broad ham and shoulder, and quiet disposition. The Duroc was smaller than the Jersey Red, with finer bones and better carcase quality. Beginning in the early 1860s, Durocs were made from a systematic blending of the two very different strains.
The first organization for the purpose of recording, improving, and promoting Red Hogs was the American Duroc-Jersey Association, which was established in 1883. At the 1893 Chicago World's Fair, Durocs gained wide popularity at the first successful Duroc Hog Show.
The Duroc made two attempts to gain a foothold in this country; the first in the early 70s was not very successful, although some of those pigs were exported on to Denmark. They were re- imported in the early 80s and a comprehensive trial was undertaken by the MLC to assess the merits of the Duroc as a terminal sire. It was found that in the British skin-on fresh pork market the Duroc could not be used as a purebred but only as component of a crossbred boar. The development of Duroc crossbred boars produced large numbers of crossbred gilts. A market was found for these due to a resurgence of interest in outdoor pig production. This has resulted in breeding and selection programmes for the British Duroc focusing on female line characteristics rather than the traditional terminal sire traits associated with the breed. The Duroc has now found a special niche in the British industry and a unique British version of the breed has been developed.
Their thick auburn winter coat and hard skin allows them to survive the cold and wet of the British winter. This coat moults out in summer to leave the pig looking almost bald, but as a consequence it can cope with hot dry summers equally well. All purebred Durocs are red in colour and the development of a so-called “White Duroc” has only been achieved by crossbreeding with a white breed.
Its tenacity in looking after its young combined with its docility between times makes it an ideal candidate for an outdoor pig, either as a dam or sire line, and its succulence and heavy muscling makes it very suitable for anything from light pork to heavy hog production.
Further research funded by the MLC has investigated the Duroc’s claim to produce high levels of tenderness. This has led to a recommendation to include Duroc genetics as part of the meat quality Blueprint.





<(
<(
<(Farm management involves agricultural economics for information about the prices in market so the farm won't run at a loss, and also agricultural policies and all other farm economic issues, crop science also gives information about the soil, the type of seed to be planted, the type of fertilizers to use to aid the growth of crops, they also help to control weeds, insects and diseases that affect the crops. animal science helps in animal production their health, and also in the control of disease among the animals and how their feed are rationed. agricultural engineering, gives information about farm buildings, and machines used on the farm.<(
In making decisions for a successful and productive farm, the farmer must integrate information from the biological, physical and social sciences.<(
<(But farm managements differs widely, the most satisfactory plan for one farm may be the most unsatisfactory plan for another, just make the plan you have works for you.<(
<(I believe you can now go back to your farm and manage it properly for maximum production and profit.




Newcastle Disease
Newcastle disease is a contagious viral infection
causing a respiratory nervous disorder in
several species of fowl including chickens and
turkeys. Different types or strains of the virus
(varying in their ability to cause nervous
disorder, visceral lesions and death) have been
recognized.
The most severe strain is called viscerotropic
velogenic Newcastle disease (VVND) and is kept
from birds in the U.S. by enforcement of strict
quarantines at our national borders. It is often
referred to as "Exotic Newcastle Disease" and
infection of susceptible fowl with this form
usually causes high mortality. Due to the
reduced chance that poultry in this country will
become infected with this disease form, it will
not be discussed.
A milder form of the disease is called
"mesogenic" Newcastle disease and is the most
serious strain found in the U.S. This is the form
that is referred to as Newcastle disease in this
discussion.
Newcastle disease is highly contagious. All birds
in a flock usually become infected within three
to four days. The virus can be transmitted by
contaminated equipment, shoes, clothing and
free-flying birds. During the active respiratory
stage, it can be transmitted through the air. The
virus is not thought to travel any great distance
by this method. Recovered birds are not
considered carriers and the virus usually does
not live longer than thirty days on the premises.
Signs of Newcastle disease are not greatly
different from those of other respiratory
diseases. The signs most frequently observed are
nasal discharge, excessive mucous in the
trachea, cloudy air sacs, casts or plugs in the air
passages of the lungs and cloudiness in the
cornea of the eye.
The disease in young chickens begins with
difficult breathing, gasping and sneezing. This
phase continues for ten to fourteen days and
may be followed by nervous symptoms. If
nervous disorders develop, they may consist of
paralysis of one or both wings and legs or a
twisting of the head and neck. The head often is
drawn over the back or down between the legs.
Mortality may vary from none to total loss of the
flock.
In adult chickens, respiratory symptoms
predominate. Only rarely do nervous disorders
develop. If the flock is laying, egg production
usually drops rapidly. When this occurs, it takes
four weeks or longer for the flock to return to
the former production rate. During the
outbreak, small, soft-shelled, off-colored and
irregular-shaped eggs are produced. Mortality
in adult birds is usually low but may be fairly
high from some virus strains.
In turkeys, the symptoms are usually mild and
may be unnoticed unless nervous disorders
develop. During an outbreak, turkeys will
produce eggs with a chalky white shell. Reduced
production in breeder flocks is the main
economic loss from this disease in turkeys.
The flock history, signs of a respiratory nervous
disorder and other typical lesions often may be
sufficient to allow a tentative diagnosis. Usually,
however, the disease cannot be differentiated
from infectious bronchitis and some of the other
respiratory infections, except by laboratory
methods.
Vaccination is practiced widely and is the
recommended method for prevention. Several
types of vaccines are available but the most
successful and widely used is the mild live virus
vaccine known as the B 1 and La Sota types. The
vaccines may be used by drops into the nostril
or eye, addition to the drinking water or applied
in spray form.
Broiler chickens are usually vaccinated when
seven to ten days of age. Chickens kept for egg
production are usually vaccinated at least three
times. The vaccine is given when birds are
approximately seven days, again at about four
weeks and a third time at about four months of
age. Revaccination while in lay is commonly
practiced.
Vaccination is not widely used in turkeys. It is
used to protect egg producing breeder flocks.
One dose of the mild type vaccine is given after
selecting breeder birds.
There is no treatment for Newcastle disease. The
disease does not always respect even the best
management programs, but good "biosecurity"
practices will help reduce the possibility of
exposure to Newcastle disease virus.
Infectious Bronchitis
Infectious bronchitis is an extremely contagious
respiratory disease of chickens characterized by
coughing, sneezing and rales (rattling). It is
caused by a virus that affects chickens only.
Other fowl or laboratory animals cannot be
infected with this virus. Several distinct strains
of the virus exist.
Infectious bronchitis is considered the most
contagious of poultry diseases. When it occurs,
all susceptible birds on the premises become
infected, regardless of sanitary or quarantine
precautions. The disease can spread through the
air and can "jump" considerable distances
during an active outbreak. It can also be spread
by mechanical means such as on clothing,
poultry crates and equipment. The disease is not
egg transmitted and the virus will survive for
probably no more than one week in the house
when poultry are not present. It is easily
destroyed by heat and ordinary disinfectants.
The infection is confined to the respiratory
system. Symptoms are difficult breathing,
gasping, sneezing and rales. Some birds may
have a slight watery nasal discharge. The
disease never causes nervous symptoms. It
prevails for ten to fourteen days in a flock and
symptoms lasting longer than this are from some
other cause.
In chickens under three weeks of age, mortality
may be as high as thirty or forty percent. The
disease does not cause a significant mortality in
birds over five weeks of age. Feed consumption
decreases sharply and growth is retarded.
When infectious bronchitis occurs in a laying
flock, production usually drops to near zero with
a few days. Four weeks or more may be required
before the flock returns to production. Some
flocks never regain an economical rate of lay.
During an outbreak, small, soft-shelled,
irregular-shaped eggs are produced.
Infectious bronchitis is difficult to differentiate
from many of the other respiratory diseases. For
this reason, a definite diagnosis usually requires
a laboratory analysis.
Infectious bronchitis is highly contagious and
does not always respect sanitary barriers.
Vaccinate chickens being retained as layers.
Whether broilers should be vaccinated depends
upon many factors and is an individual decision.
Numerous vaccines are available commercially.
Most of them represent a modified or selected
strain of the infectious bronchitis virus. The
vaccine used should contain virus known to be
present in the area. All vaccines contain live
virus and those that give the best protection are
also capable of producing symptoms and
reducing egg production. The vaccine virus will
spread to other susceptible birds. Vaccine is
usually added to the drinking water, but may be
dropped into the eye or nostril or used as a
spray.
There is no treatment for this disease. In young
chickens it is helpful to increase the brooder
temperature and provide as nearly ideal
environmental conditions as possible.
Quail Bronchitis
Quail bronchitis is a contagious, highly fatal
disease in young bobwhite quail. The virus
causing this disease also infects chickens and
turkey. This agent is also known as a CELO
(Chick Embryo Lethal Organism) virus. It has
been isolated from chicken eggs but does not
produce a recognizable disease in chickens or
turkeys. This agent may play a part in
respiratory diseases and in infertility problems,
but its importance must be established by
additional research. It is important because it is
one of the agents that may be isolated from birds
with respiratory symptoms and is difficult to
separate from other agents such as infectious
bronchitis virus.
Lymphoid Leukosis
Characteristically, lymphoid leukosis is a disease
of adult chickens; however, the disease appears
to be increasing in importance for turkeys and
game birds. Although the virus of lymphoid
leukosis can produce various responses (blood,
bone, lymph), the lymphoid tumor response is
the most common.
The disease is transmitted in a variety of ways.
The causative viral agent is passed out of the
body of infected birds via eggs and feces. The
virus may be transmitted mechanically from
infected birds to susceptibles by blood-sucking
parasites or by man in such procedures as fowl
pox vaccination.
Lymphoid leukosis characteristically produces
lymphoid tumors, particularly in the liver and
spleen. The tumors may also affect other visceral
organs such as ovary and lungs. Affected birds
may die without preliminary symptoms, but the
disease usually is chronic in nature and affected
birds show loss of appetite, progressive
emaciation and diarrhea. Clinically affected
birds invariably die. Losses due to the disease
are most severe shortly after onset of egg
production, but losses will continue for as long
as the flock is retained. Total loss may approach
twenty percent during the life of a flock.
Clinical diagnosis of lymphoid leukosis is based
upon flock history and disease manifestations.
The lymphoid disease cannot be readily
distinguished from the visceral response to
Marek's disease; however, there are some
features that aid in differential diagnosis.
There is no treatment for lymphoid leukosis.
Although the disease cannot be prevented
completely, there are certain steps that can be
taken to help control the level of infection within
a flock. Some steps are:
Buy resistant strains of birds since genetic
resistance is a deterrent,
Brood in isolation and do not mix birds of
different ages, especially through six weeks of
age,
Keep the incubator clean and disinfected,
Control blood-sucking parasites,
Good care, limiting stress, and adequate ration
will be of benefit.
Marek's Disease (Visceral Leukosis)
Marek's disease is characteristically a disease of
young chickens but older birds can also be
affected. In contrast to the lymphoid leukosis
tumor response, Marek's disease may be
observed in more diverse locations.
Marek's disease is caused by a virus belonging
to the Herpes virus group. Much is known about
the transmission of the virus; however, it
appears that the virus is concentrated in the
feather follicles and shed in the dander
(sloughed skin and feather cells). The virus has a
long survival time in dander since viable virus
can be isolated from houses that have been
depopulated for many months.
The usual mode of transmission is by aerosols
containing infected dander and dust. Young
birds are most susceptible to infection by
Marek's disease; however, since the incubation
period is short, clinical symptoms can appear
much earlier than in the case with lymphoid
leukosis.
Marek's disease may produce a variety of clinical
responses, all lymphoid in character. These are
acute visceral, neural, ocular, skin or
combinations of the responses that can be seen.
Marek's of the visceral type is characterized by
widespread involvement with lesions commonly
seen in gonads, liver, spleen, kidney and
occasionally heart, lungs and muscles. The
disease is often acute, with apparently healthy
birds dying very rapidly with massive internal
tumors. The disease may appear in broiler-age
birds but the most severe losses occur in
replacement pullet flocks prior to onset of egg
production.
The neural type of Marek's is typified by
progressive paralysis of the wings, legs and
neck. Loss of body weight, anemia, labored
respiration and diarrhea are common symptom.
If lesions are present, they are confined to the
nerve trunks and plexes enervating the
paralyzed extremities. Frequently no gross
lesions can be observed.
Ocular (eye) leukosis or "gray-eye" is usually
seen in early maturity. Morbidity and mortality
are usually low but may approach twenty-five
percent in some flocks. It is characterized by the
spotty depigmentation or diffuse graying of the
iris in the eye. The pupil develops an irregular
shape and fails to react to light. Emaciation
diarrhea and death follow.
Skin leukosis produces the most severe losses in
broilers. The losses result from high
condemnations at the processing plant.
Enlargement of the feather follicles due to
accumulations of lymphocytes is the typical
lesion. This is the most infective virus since it is
produced in the regions of the feather follicles
and is shed with the skin dander.
Acute Marek's disease can be extremely rapid in
its course, producing mortality in apparently
healthy birds. However, in some cases the
lesions may regress and clinically affected birds
may make complete recoveries.
Diagnosis is based upon flock history and
disease manifestations. Accurate diagnosis may
depend on results of laboratory procedures. As
is the case with lymphoid leukosis, there is no
treatment for Marek's disease.
A vaccine is available that is extremely effective
(90% +) in the prevention of Marek's disease. It
is administered to day-old chickens as a
subcutaneous injection while the birds are in
the hatchery. Use of the vaccine requires strict
accordance with manufacturer's
recommendations in a sterile environment.
Infectious Bursal Disease (Gumboro)
Infectious bursal disease is an acute, highly
contagious viral disease of young chickens. It is
most often found in highly concentrated poultry
producing areas. It causes marked morbidity
and mortality in affected flocks. Although the
disease causes severe losses, its affect on
reducing the bird's ability to develop immunity
to other diseases may be the most serious effect
produced by this disease.
The transmission or spread of the disease can
occur by direct contact (bird to bird),
contaminated litter and feces, caretaker,
contaminated air, equipment, feed, servicemen
and possible insects and wild birds. It is
extremely contagious.
Birds have ruffled feathers, a slight tremor at
onset of the disease, strained defecation, loss of
appetite and are dehydrated. Affected birds
have a tendency to sit and when forced to move,
have an unsteady gait. Vent picking is common
and a whitish diarrhea frequently develops. A
sudden rise in body temperature is followed by a
drop to subnormal temperature, prostration and
death. Birds surviving the initial infection will
recover rapidly within two weeks.
Postmortem lesions include dehydration and
changes in the bursa, skeletal muscle, liver and
kidneys. All affected birds have bursal changes
characterized by swelling, change in shape
(oblong), color (pink, yellow, red, black) and the
formation of a gelatinous film around the bursa.
Within a few days the bursa shrinks to half its
normal size or smaller.
Diagnosis of infectious bursal disease is based on
flock history and postmortem lesions. Laboratory
procedures may be used to substantiate the
diagnosis.
Vaccines are available but must be carefully
used. If given correctly, good immunity can be
developed. There is no specific treatment for
infectious bursal disease and indiscriminate
medication with certain drugs may severely
aggravate mortality. Supportive measures such
as increasing heat, ventilation and water
consumption are beneficial.
.......#source http://msucares.com/poultry/diseases/disviral.htm





