Purebred sheep: Katahdin
New Zealand Romney
Meat breed: Texel
Upgrading to Dorper
Sire breed: Oxford
Maternal breed: Polypay
Whiteface breed: Merino
Fine wool: Rambouillet
Long wool: Romney
Hair sheep: Katahdin
Rat-tailed: East Friesian
Aseasonal: - Horned Dorset
Prolific: Barbados Blackbelly
Crossbred dairy ewes
3-way cross lambs
Mixed breed ewes
Long wool: Lincoln
Suffolk ewe lamb
Hair x Wool lamb
Selecting a breed of sheep
According to some estimates, there are more than 1,000 breeds of sheep worldwide
and more than 50 in the United States alone. More breeds are being introduced to the US all the time, mostly via imported semen or embryos. While only a
handful of breeds are probably of economic importance to the commercial industry, all breeds
have value, as they contribute to the genetic diversity of the
species and worldwide industry.
Deciding which breed (or type) of sheep to raise is an important decision
that each shepherd must make with thoughtful consideration. The reason(s) for raising sheep should
be primary consideration(s) when deciding upon breeds
or types. This is because if you are interested in producing wool
for the hand spinner's market, your breed choice would be much
different than if meat will be your primary product to sell.
Conversely you should not choose "wool" breeds, if the
majority of your income is going to be derived from the sale of lambs (meat) or dairy. If your children
or grandchildren want to compete in 4-H or junior market lamb shows, breed will affect their competitiveness in the show ring, thus their satisfaction with the experience. Price
and availability will also have a bearing on which breeds
are chosen. Not all breeds are available in all geographic areas. It is not easy or inexpensive to import live animals, semen, and embryos from other countries
It is important to understand that there are no "best" breeds of sheep. All breeds have traits which may make them desirable or undesirable, depending upon the production system and marketing objectives. A breed may be "best" for one production environment or market and a poor choice for others. In addition, there is usually as much difference within a breed as between breeds.
Crossbred, Purebred, or Registered?
A crossbred is an animal whose sire (father) and dam (mother)
are of different breeds or breed types, while a purebred animal's
parents are of the same breed or type. A registered animal has a known ancestry with a documented pedigree. However, it could be crossbred (percentage purebred) or purebred (fullblood), depending upon the requirements of its breed association.
Most sheep breeds have closed flock books, meaning only 100% purebred
animals with registered parents can be registered in the flock
book. Some breed associations have open flock books (e.g. Katahdin
and Dorper) which allow percentage animals to be
recorded by the breed association. Percentage sheep are usually
recorded as part of an upgrading program. Once they reach a certain percentage of purebreeding, they are eligible for full registration.
While purebred sheep usually sell for higher prices than crossbred
sheep and registered animals tend to cost more than non-registered
animals, breed type (or purity) or registration status is in no
way indicative of quality and especially productivity. In fact, crossbred
animals tend to be hardier and more productive than their purebred counterparts.
The "superiority" of crossbred animals is due primarily to "heterosis" or "hybrid vigor,"
a natural phenomenon whereby the performance of the crossbred offspring
is superior to the average performance of the parent breeds. Heterosis
is maximized when a crossbred ewe is mated to a crossbred ram. The effects of heterosis are additive: individual + dam + sire. Traits which response poorly to selection generally have higher levels of heterosis.
Heterosis still occurs to some extent in the newer "composite" breeds,
such as Katahdin and Polypay.
Another advantage to crossbreeding
is breed complementarity. Breed complementarity is when the weaknesses of one breed
are offset by the strengths of the other breed and vice versa.
When utilizing breed complementarity, it is important utilize breeds in their appropriate roles. For example: crossing a Suffolk to Katahdin to produce crossbred lambs balances the superior growth and meat type of the Suffolk with the outstanding maternal characteristics of the Katahdin.
The reverse cross would be the same genetically, but it would not be using the breeds in their appropriate roles.
Unless the objective is to raise and sell purebred and/or registered
sheep, it is almost always better to raise crossbred or unregistered sheep. This is especially
true for beginners. It is better to "practice" shepherding with
hardier, less expensive animals. As shepherds, we also tend to make excuses for purebred or registsered animals that we pay a lot for. Shepherds are more likely to cull a less expensive crossbred ewe or ram.
Oftentimes, it is more useful to look at breed "types"
rather than individual sheep breeds. Breed types tend to share
common characteristics and can usually be substituted for one
another in a breeding program. There are several ways in which sheep breeds can be categorized, including purpose, use, face color, fiber type,
and various physical or performance attributes.
The most useful way to categorize sheep breeds is according to their primary
purpose: meat, wool, or dairy. While most sheep breeds are dual-purpose
(i.e. they produce both meat and wool) and some are even triple-purpose
(dairy, meat, and wool), most sheep breeds excel in either the
production of meat, wool, or dairy -- seldom two or all three.
Thus, if you want to milk sheep, you shouldn't choose a meat
breed, even though it produces milk to feed its lambs. Nor should
you choose a wool breed, if your primary purpose for raising
sheep is meat production, even though wool breeds are harvested
Classification of U.S. sheep breeds by their primary purpose
Dual or Multi- purpose
Black Welsh Mountain
Calif. Variegated Mutant
Gulf Coast Native
Ile de France
North Country Cheviot
Sheep breeds are often categorized as to whether they are more
suitable as a ram or ewe in the breeding program. Ram or "sire"
breeds excel in growth and carcass (meat) characteristics
whereas ewe or "dam" (maternal) breeds excel in fitness
(e.g. longevity, parasite resistance), reproductive traits
(early puberty, prolificacy, milk production), and sometimes wool production (staple length, fiber diameter).
Sire breeds are often called "terminal sires" because
the offspring from their matings are all marketed (terminated)
whereas lambs sired by a maternal ram, such as Finnsheep, are
usually kept as flock (ewe) replacements.
The most popular terminal sire breed in the United States is
still probably the Suffolk. Hampshires are also popular for this purpose. In Europe, the Texel is the most popular sire of market lambs. Texels are becoming increasing popular as a terminal sire breed in the US, especially if lambs are finished on pasture.
Some sheep breeds are
considered dual-purpose because they have traits which make
them suitable as either a ram or ewe breed. Examples of dual-purpose breeds include the Dorper, Dorset, Columbia, and North Country Cheviot.
Some breeds fall under the "landrace" category. A landrace is a breed that is locally-adapted, developing over time, under natural conditions. Landrace breeds are influenced more by natural selection than the artificiall selection that has shaped most of today's more popular breeds. Landrace breeds represent a valuable genetic resource. Many of the rare or heritage breeds are landrace.
Wooled sheep breeds are often classified by their face color. Black
or non-whiteface breeds (e.g. Suffolk, Hampshire, Shropshire, Oxford, and Southdown)
tend to excel in growth and carcass traits, whereas the white-face
breeds (e.g. Rambouillet, Targhee, and Polypay) tend to have
superior maternal and wool traits.
In some countries, black-face sheep are strongly discriminated
against because the dark fibers and hairs in their fleeces can
contaminate a wool clip. In Australia, they developed the
White Suffolk breed to prevent this problem. There is some effort in the United States to develop a similar whiteface terminal sire breed.
Fiber or Coat Type
Ideally, hair sheep and wool sheep should not be raised together in the same pasture or pens, if high quality wool is the production objective. This is because hair fibers from the hair sheep may contaminate the fleeces of wool sheep. The risk of contamination may be low, but because it is possible, some wool mills will not purchase wool from flocks that comingle hair and wool sheep. The fleeces from hair x wool sheep should be discarded to prevent contamination of wool clips.
One of the most common ways to categorize sheep breeds is according to the
type of fibers they grow or type of coat they have. All
sheep grow both hair and wool fibers. Hair breeds have more
hair fibers than woolly fibers and usually shed their coats annually.
Some hair breeds have few if any wool fibers in their coats, especially if they are being raised in a warm climate. Hair sheep usually do not require shearing, crutching, or docking.
In contrast, wooled breeds have more woolly fibers and need to be sheared,
usually at least once per year. Ideally, wooled sheep should
be crutched, if they are not sheared prior to lambing. Crutching
is the removal of wool around the vulva area and udder. Originally,
all sheep were hair sheep. The soft, short undercoat ("down")
of hair sheep was favored in selection programs and led to the
development of the wooled breeds of today.
Fine wool sheep
Fine-wool sheep grow wool fibers with the smallest fiber diameter
(usually less than 22 microns). A micron is one millionth of a meter, too small to be detected by the naked eye. Fine wool fleeces tend to be
shorter in length and contain the most lanolin (wool wax or grease).
Though some fine wool fleeces are high yielding, fine wool fleeces usually yield a lower percentage of clean
fiber than longer, coarser fleeces. Fine wool is the most valuable
wool in the commercial marketplace because it is used to make the highest
quality wool garments and has the most versatility of use. Fine-wool is less likely to itch when
it is used in garments that are close to the skin.
Fine-wool sheep tend to be hardy and long-lived. Most trace their
ancestry to the Spanish Merino. Fine-wool sheep have a strong
flocking instinct and are well-adapted to arid climates, such
as South Africa, Australia, and the western United States and
Canada. Fine wool sheep (mostly Rambouillet) and their crosses are the most numerous
sheep in the U.S. sheep industry. Worldwide, fine wool sheep comprise approximately
50 percent of the sheep population.
Long wool sheep
At the other end of the spectrum are long or coarse wooled sheep. They grow wool fibers that have a larger fiber
diameter (usually more than 30 microns) and longer staple length.
Their fleeces tend to yield more clean fiber because they usually contain less
lanolin. Carpet wool is even longer and coarser than long wool.
Long wool sheep do best where feed resources are abundant.
Long wool sheep are most common to cool, wet climates such as the United
Kingdom, New Zealand, and the Falkland Islands. Many of the
long wooled breeds in the U.S. can trace their ancestry to the
British Isles. The fleeces from the long wooled breeds tend
to be favored by hand spinners and weavers. Long wooled sheep are often favored by shepherds who want to niche market their fleeces.
Medium wool sheep
The length and fiber diameter of
medium wool fibers is intermediate between fine and long. Most
of the meat-type breeds grow medium wool. Medium-wool sheep
comprise about 15 percent of the world sheep population and include some of the most popular US breeds.
It is estimated that hair sheep comprise about 10 percent of the world's sheep population,
and their popularity is increasing in temperate climates such
as North America and Europe. In the United States, there are
two general types of hair sheep: "improved" and "unimproved"
(or landrace) breeds. The unimproved breeds tend to be indigenous
sheep breeds that have adapted well to the local environment
in which they evolved. Examples include the Barbados Blackbelly
and St. Croix.
The American Blackbelly or "Barbado" is believed to
be a cross between the Barbados Blackbelly, Mouflon, and Rambouillet.
The Wiltshire Horn is a shedding sheep native to the British
Isles. The improved hair breeds are crosses between hair sheep
breeds and meat-type, wooled breeds. Examples include the Dorper,
Katahdin, Royal White, and St. Augustine.
Hair sheep can also be differentiated by their place of origin. Some
hair breeds originate from tropical climates (e.g. Barbados
Blackbelly and St. Croix). These breeds tend to be more resistant
to internal parasites. Other breeds originate from arid regions
and are best-adapted to similar conditions (e.g. Dorper and
There are many breeds which produce specialty-type wools. Carpet wool is the coarsest wool produced by sheep. As the name implies, carpet wool is used to make carpets. Double-coated breeds grow a longer outer coat and a short fine undercoat. Primitive breeds have similar types of fleeces (inner and outer) that naturally shed. There are a few breeds whose fleeces are a specific color or color pattern. The Shetland breed produces wool in the widest range of colors of any breed. Jacobs produce a spotted fleece.
Classification of U.S. sheep breeds by wool or coat type
Gulf Coast Native
Ile de France
Calif. Variegated Mutant
Black Welsh Mountain
Type of Tail
Some breeds are grouped together because they have a special
kind of tail. Fat-tailed or fat-rumped breeds make up about
25 percent of the world sheep population. They are well-adapted
to arid regions and are found mostly in Africa and Asia. Among
U.S. breeds, the Karakul is fat-tailed, while the Tunis and Dorper
have fat-tail origins. Though none of these breeds has a significant fat deposits in the tail. The Awassi (recently introduced via semen) is also a fat-tailed sheep.
The U.S. is home to several breeds of the Northern European
short or rat-tail variety of sheep: Finnsheep, Romanov, East
Friesian, Shetland, Icelandic, and Soay. The tails of these
short-tailed breeds do not need to be docked. In addition to their unique tails, these breeds are
known for their prolificacy (large litters).
Some breeds of sheep are noted for their fecundity: birth of large litters. Prolific breeds of sheep include Finnsheep, Romanov,
and Booroola Merino.
Most of the hair sheep breeds also have good prolificacy. The Booroola Merino is noteworthy because it has a single gene
that is responsible for its high reproductive rate. The "F"
(fecundity) gene can be transferred to other breeds.
A single gene affecting prolificacy has also been isolated in
Icelandic and Cambridge sheep, as well as the Chinese Hu. In most sheep breeds, litter
size is a quantitative trait affected by many different genes.
Despite its low heritability, prolificacy (or litter size) is a trait that most sheep producers should select for, assuming the production environment is conducive to the rearing of multiple lambs.
Rare and Heritage Breeds
There are organizations and individuals dedicated to the
preservation of rare and heritage breeds of livestock. Heritage breeds are breeds raised historically -- breeds of a bygone era -- whereas rare breeds are breeds with limited animal numbers and registrations. Many heritage breeds are also rare breeds. The Livestock Conservancy classifies rare breeds into several categories: critical, threatened, watch, recovering, and study.
The Navajo Churro is considered to be the oldest breed of sheep
in the United States. Gulf Coast Natives and Florida Crackers are also very old breeds. All three descend from the sheep brought to the New World by Spanish settlers. Churras are hardy sheep best suited to arid climates, whereas the Natives and Crackers are known for their parasite resistance, having developed naturally under the warm, moist climate characteristic of the Southeast US.
A British breed of historical significance is the Leicester Longwool. The Colonial Williamsburg Foundation leads efforts to preserve this longwool breed. Hog Island sheep inhabited Virginia's barrier islands and are now raised at Mt. Vernon, home of George Washington. Santa Cruz is another breed that evolved via natural selection, on California's Channel Islands.
rare and heritage breeds are usually no longer of commercial significance,
it is important to preserve their genetics.
In addition, some of the heritage breeds may be hardier than many of the
more popular breeds that have been altered by the show ring or artificial selection.
Heritage breeds are especially ideal for small, hobby farms or historical
farms or estates.
Ewe Breed Selection
When choosing a ewe breed or type, many factors are important.
1. Adaptability to the production environment
2. Type of coat or wool
3. Level of reproduction
4. Timing and frequency of lambing
5. Level of care
While any breed of sheep can be raised in any geographic location, it makes sense to choose breeds which are best adapted to the environment in
which they are going to be raised. For example, fine wool breeds
and hair sheep (of desert origin) are good choices for hot, dry climates where feed may be scarce. Where it is hot
and humid (moist), the Gulf Coast Native, Florida Crackers, or hair sheep (of tropical
origins) are good choices, because of their heat tolerance
and enhanced parasite resistance.
In cold, wet areas where feed is abundant, the long wool and
meat breeds are good choices. Since dairy breeds and prolific
breeds are usually raised under intensive management systems,
environmental adaptation is usually less important. Some sheep are
adaptable to different climates. For example, hair sheep will
grow thicker coats (i.e. more wool) when they are raised in
colder climates. Over time any sheep will adapt to the environment. Selection can hasten the development.
Type of Wool or Coat
The type of wool or coat desired is obviously an important consideration
when establishing a ewe flock. If you do not want to shear your
sheep, hair sheep (or goats) are your only choice. For the commercial
wool market (sales to wool pools and mills), the fleeces from
fine wool ewes and their crosses will bring more money. Due to the
absence of dark hairs and fibers, the wool from white-faced
breeds is more desirable than the wool from black or other non-white-faced
If commercial pelts are a consideration, the pelts from white
faced sheep and fine wool breeds are more desirable in the commercial
marketplace. If you are interested in producing wool for hand
spinning, any breed of wool sheep can be raised, but the wool
from the long wooled breeds and specialty breeds seems to be in the greatest demand. Natural colored fleeces and pelts are also
desirable in niche markets. The leather market is an untapped
market in the United States. The pelts from hair sheep produce
the highest quality leather.
Level of Reproduction
Not all shepherds desire large litters of lambs. Nor can all production environments support prolific ewes.
On the other hand, ewes that produce only one lamb are not usually profitable unless feed costs and overhead are very low. Breed
choice can have a large impact on the reproductive rate of the
flock. Prolific breed ewes will produce litters of lambs (3
Ewes containing 50 percent or more of a prolific breed will
usually drop lamb crops in excess of 200 percent. Ewes containing
25 percent of a prolific breed are capable of producing 200
percent lamb crops. Hair sheep, of tropical origins, typically produce lamb crops in excess of 200 percent. Under proper management and nutrition, many
other breeds are capable of producing close to a 200 percent lamb crop.
Of course, any breed of sheep can be selected to produce larger
lamb crops, though it requires a long-term commitment, as
litter size is only about 10 percent heritable. In addition, a high
litter size is only advantageous if quality lambs are produced and the extra lambs can be raised
to market profitably. It is very important that reproductive rate be matched to the production environment and level (skill) of management.
When to Lamb
In temperate climates, most sheep are seasonal breeders, biologically "programmed"
to mate in the fall when day length is shorter and to lamb in
late winter or spring when the pasture begins to grow (and predators have babies to feed!). To produce "out-of-season" lamb, that go against this "norm," you need
to select breeds (or individual sheep) that are able to breed at different times of the year.
In the US, the Dorset is best known for its ability to lamb
year-round, though there are considerable differences for this
trait within the breed. In fact, the Horned Dorset is usually
considered to be superior to the Polled Dorset with respect to out-of-season
breeding. This is because many Polled Dorsets have been bred for show ring qualities and not production traits.
Other breeds with extended breeding seasons include fine wool
sheep (e.g. Rambouillet and Merino), hair sheep, Finnsheep,
Polypay, and Karakul. The breeds which are most seasonal in
their breeding habits are the long wool breeds and meat
breeds of British origin.
Any breed of sheep can be selected for the ability to lamb in
the fall. Spring breeding can also be achieved with light control or
hormonal manipulation. CIDR's are now FDA-approved for use in sheep. The introduction of a ram can stimulate
estrus activity in seasonally-anestrous ewes.
Level of Care
Sheep raising is more labor intensive than raising
beef cattle, but there are breeds of sheep which are naturally hardier and/or have been selected for their easy or self-care nature.
Such breeds include hair sheep, Border and North County Cheviots,
Coopworths, fine wool breeds, and some of the rare or heritage breeds
(e.g. Soay, Shetland, Icelandic).
Those breeds which generally require a higher level of care
(or labor) include the British meat breeds, long wool breeds,
prolific breeds, and dairy breeds. Of course, any flock of sheep
can be selected and managed to minimize care (labor). In other
words, if you want to work hard raising sheep, you can.
If you want the sheep to work for you, you can favor easy-care
traits (e.g. unassisted lambing, minimal hoof trimming, minimal
deworming) in your management and selection program.
Ram Breed Selection
Before choosing a breed of ram, you need to determine his
primary purpose. Will he be used to sire market lambs, or do
you want him to sire ewe replacements? Or both? For producing
replacements, you need a ram with the appropriate type of wool/coat, fitness, and reproductive characteristics.
For market lamb production, you need a ram that will sire lambs
that are suitable for your target market(s). For example, if
you want to produce lambs for the mainstream, heavy lamb (100-140
lbs) markets, your choice of a ram breed would be very different
from the ram breed you would choose to sire lambs for the hot
house (35 to 50 lbs.) or ethnic markets (60-120 lbs.)
This is because lambs sired by large-framed breeds such as the
Suffolk and Columbia are not very desirable at light weights
because they have inadequate muscling and fat. Conversely, lambs
sired by small and medium sized breeds such as the Dorset and
Southdown, will likely get too fat if they are fed to heavy
weights, as these lambs are more ideally suited to the lighter
weight lamb markets.
Some producers have been able to create a demand for the meat
from certain breeds of sheep. For example, many ethnic buyers
like hair sheep lambs because they are accustomed to similar-looking
sheep in their homelands. Hair sheep and coarse, long wooled
breeds are ideally suited to the freezer market, because their
meat has a milder flavor than lambs from fine-wool breeding. At the same time, it is important to remember than diet exerts a larger influence on lamb flavor than genetics, with grain-fed lamb usually being milder in flavor the pasture-finished lamb.
In fact, diet should also be considered when choosing the sire of market lambs. Lambs sired by small and medium-sized breeds will fatten more easily on pasture diets than lambs sired by large framed breeds. Conversely, lambs with a higher genetic potential for growth should probably be favored in feed lot finishing systems. Parasite resistance is another important trait to consider (in a ram breed) when the aim is to finish lambs on pasture. There is a growing body of evidence to suggest that the Texel breed is more resistant to internal parasites than most other wooled breeds. Thus, they are a good choice for siring lambs that will be pasture-finished.
Purebred rams are often favored over crossbred rams because
there will be more uniformity in their offspring. However,
crossbred rams tend to be superior in their breeding ability, especially with regards to out-of-season breeding. Crossbred rams may also allow you to achieve the desired breed composition in the crossbred lamb.
Selecting a breed of sheep
<== SHEEP 201 INDEX