Why Do Sheep not have Top Teeth?


Why Do Sheep not have Top Teeth_

Sheep have teeth but not at the front. They have a plate at the front of their mouths that act like serrated scissors to help them grab grass, They use their tongue to also wrap around roughage and tear it out. In Back of Mouth, they have five to six-row of teeth to help them chew their food. Their Front Top is a Fibourous Pad They are ruminants they regurgitate their food. 

Determining the age of a Sheep by its Teeth

Why do we Classify the Sheep as a Ruminant Animal?

Ruminants are hoofed mammals that have a unique digestive system that allows them better to use energy from woody plant material than other herbivores.

Unlike monogastric such as swine and poultry, ruminants have a digestive system designed to ferment feedstuffs and provide precursors for energy for the animal to use, by better understanding how the digestive system of the ruminant works, livestock producers can better understand how to care for and feed ruminant animals.

Mobile Classroom Dairy Production

Ruminant Digestive Anatomy and Function:

The ruminant digestive system uniquely qualifies ruminant animals such as sheep to use high roughage feedstuffs, including forages efficiently. Anatomy of the ruminant digestive system including

  • Mouth,
  • Tongue,
  • Salivary glands (producing saliva for buffering rumen pH),
  • Esophagus,
  • Four-compartment stomach (rumen, reticulum, omasum, and abomasums),
  • Pancreas,
  • Gall-bladder,
  • Small intestine,
  • Large intestine. 
Understanding Ruminants Digestion

A ruminant uses its mouth (oral cavity) and tongue to harvest forages during grazing or to consume harvested feedstuffs.

Sheep harvest forages during grazing by wrapping their tongue around the plants and then pulling to tear the forage for consumption. 

The roof of the ruminant mouth is a hard/soft palate without incisors. The lower jaw incisors work against this hard dental pad. The incisors of grass/roughage selectors are wide with a shovel-shaped crown.

In contrast, those of concentrate selectors are narrower, and chisel-shaped premolar and molars match between upper and lower jaws. These teeth crush and grind plant material during initial chewing and rumination.

Dental Anatomy of Sheep:

Through dental anatomy, you can know about the age of the sheep.

  • The number,
  • condition,
  • and order of eruption of the permanent incisors
  • of sheep is the main indication of their age. 

There is, however, a wide variation in the time of eruption of the permanent incisors caused by variation in breed, strain, and environment, and particularly by nutrition.

The teeth of a sheep are divided into two distinct sections, namely, eight permanent incisors in the lower front jaw and twenty-four molars, the latter being divided into six on each side of the upper and lower jaw. 

Sheep have no teeth in the front part of the upper jaw which consists of a dense, hard, fibrous pad. 

When born, the lamb usually has no teeth. Within a week after birth, the milk teeth temporary teeth appear in the front lower jaw and by the time the lamb is two months old these, eight in all, have erupted. 

These temporary teeth are replaced by permanent incisors, which appear in pairs, commencing with the central teeth, followed by one on either side at intervals, until the eight temporary teeth have been replaced. 

During the period of teeth are growing, sheep are referred to by the number of permanent incisors present, such as two-tooth, four-tooth, six-tooth, eight-tooth, or full mouth.

The accompanying diagram sets out the development of the permanent incisors and the variation in age at which they may erupt. 

Only a rough estimate of a sheep’s age can be made by looking at its teeth. When estimating the age. It is important to bear in mind whether the breed is early or late maturing. 

British breeds, for example, mature at a faster rate than Merinos, and their teeth erupt at an earlier age.

The condition of the teeth will vary according to the type of feed and country grazed on. On the long, soft feed, where close grazing is necessary, particularly if the soil is sandy or gravelly, the teeth will wear down. 

Broken Mouth

After the eight permanent incisors have appeared, the next stage is known as ‘broken mouth’. This is the following determination, the rate depending on the conditions under which the sheep were grown. 

Gummy

The estimation of age at this stage is very difficult. The teeth gradually become longer with wide spaces, become longer with wide spaces, eventually falling out, or they may wear down, become loose and fall out. After the teeth have fallen out, the sheep is known as a gummy.

  Age / By Teeth

  • 15 months Only one sheep was rising 2-tooth.
  • 16 months Two were 2-tooth and a third was
  • rising 2-tooth.
  • 19 months All sheep showing as 2-tooth, one
  • rising 4-tooth.
  • 22 months. All were 4-tooth or rising 4-tooth
  • 27 months Two sheep were rising 6-tooth.
  • 28 months Two more were rising 6-tooth.
  • 29 months All sheep (eight at this stage) were
  • rising 6-tooth.
  • 32 months All sheep were 6-tooth.
  • 34 months Six sheep were rising full mouth.
  • 36 months All sheep were rising full mouth.
  • 38 months All sheep were full mouth.

See This Page for Lamb – 4 Years Old Diagram

Ohio State University Telling the Age of a Goat / Sheep

 The Function of the Saliva:

Saliva aids in chewing and swallowing contain enzymes for the breakdown of fat and starch and are involves in nitrogen recycling to the rumen. Saliva’s most important function is to buffer pH levels in the reticulum and rumen. 

Forage and feed mixes with saliva containing sodium, potassium, phosphate, bicarbonate, and urea when consumed, to form a bolus. That bolus then moves from the mouth to the reticulum through a tube-like passage called the esophagus. Muscle contraction and pressure difference carry this substance down the esophagus to the reticulum. 

Chewing the Cud

Ruminants eat rapidly, swallowing much of their feedstuffs without chewing it sufficiently. Then it comes back up and is chewed again mixing salvia.

The esophagus functions bidirectionally in ruminants, allowing them to regurgitate their cud for further chewing, if necessary. The process of rumination or “chewing the cud” is where forage and other feedstuffs are forced back to the mouth for further chewing and mixing with saliva. The cud is then swallowed again and passed into the reticulum.

Then the solid portion slowly moves into the rumen for fermentation, while most of the liquid portion rapidly moves from the reticulorumen into the omasum and the abomasum. The solid portion left behind in the rumen typically remains for up to 48 hours and forms a dense mat in the rumen, where microbes can use the fibrous feedstuffs to make precursors for energy. 

True ruminants, such as sheep have one stomach with four compartments:

  • Rumen,
  • Reticulum,
  • Omasum,
  • Abomasums.

The ruminant stomach occupies almost 75 percent of the abdominal cavity, filling nearly all of the left side and extending significantly into the right side. The relative size of the four compartments is as follows: the rumen and reticulum comprise 84 percent of the volume of the total stomach, the omasum 12 percent, and the abomasums 4 percent. The rumen is the largest compartment of the stomach. 

The reticulorumen is home to a population of microorganisms (microbes or rumen bugs) that include bacteria, protozoa, and fungi. These microbes ferment and break down plant cell walls into their carbohydrate fractions and produce volatile fatty acids (VAFs), such as acetate (used for fat synthesis), propionate (used for glucose synthesis), and butyrate from these carbohydrates. The animals later use these VAFs for energy.

Honeycomb

The reticulum is called the “honeycomb” because of the honeycomb appearance of its lining. It sits underneath and toward the front of the rumen, lying against the diaphragm. Ingesta flows freely between the reticulum and rumen. The main function of the reticulum is to collect smaller digest particles and move them into the omasum, while the large particles remain in the rumen for further digestion. 

Paunch

The rumen is sometimes called the “paunch”. It is lined with papillae for nutrient absorption and divided by strong pillars into the dorsal, ventral, caudodorsal, and caudoventral sacs. The rumen acts as a fermentation vat by hosting microbial fermentation. About 50 to 65 percent of starch and soluble sugar consumed is digested in the rumen.

Rumen microorganisms digest

  • Cellulose from plant cell walls,
  • Digest complex starch,
  • Synthesize B vitamins,
  • Vitamin K.
  • Rumen pH typically ranges from 6.5 to 6.8. The rumen environment is anaerobic. Gases produced in the rumen include carbon dioxide, methane, and hydrogen sulfide. The gas fraction rises to the top of the rumen above the liquid fraction. 

Butcher’s Bible

The omasum is spherical and connected to the reticulum by a short tunnel. It is called the many piles, or the butcher’s bible about the many folds or leaves that resemble pages of a book. These folds increase the surface area, which increases the area that absorbs nutrients from feed and water. Water absorption occurs in the omasum. 

The abomasums are the true stomach of a ruminant. It is the compartment that is most similar to a stomach in a non-ruminant. The abomasums

  • Produce hydrochloric acid
  • Digestive enzymes,
  • Pepsin (breakdown the protein),
  • and receives digestive enzymes secreted from the pancreas,
  • Pancreatic lipase (breakdown fats).
  • This secretion helps prepare proteins for absorption in the intestines. The pH in the abomasums generally ranges from 3.5 to 4.0. The chief cells in the abomasums secrete mucous to protect the abomasal wall from acid damage. 

The small and large intestines follow the abomasums as further sites of nutrient absorption. Digesta entering the small intestine mix with secretions from the pancreas and liver, which elevate the pH from 2.5 to between 7 and 8. The higher pH is needed for enzymes in the small intestine to work properly. Bile from the gall bladder is secreted into the first secretion of the small intestine, the duodenum, to aid in digestion.

Active nutrient absorption occurs throughout the small intestine, including rumen bypass protein absorption. The intestine wall contains numerous “finger-like” projections called villi that increase intestinal surface area to aid in nutrient absorption. Muscular contraction aid in mixing digesta and moving it to the next section. 

The large intestine absorbs water from material passing through it and then excretes the remaining material as feces from the rectum. The cecum is a large blind pouch at the beginning of the large intestine. The cecum serves a little function in a ruminant, unlike its role in horses. The colon is the site of most of the water absorption in the large intestine.

Rumen Digestive Development:

Immature ruminants, such as kids of the sheep from birth to the 2 to 3 months of age, as functionally non-ruminants. The reticular grooves in these kids are formed by muscular folds of the reticulum. It shunts milk directly to the omasum and then abomasums, bypassing the reticulorumen.

The rumen in these kids must be inoculated with rumen microorganisms, including bacteria, fungi, and protozoa. This is thought to be accomplished through mature ruminants licking kids and environmental contact with these microorganisms.

Immature ruminants must undergo reticulorumen-omasal growth, including increases in volume and muscle. In a kid at birth, the abomasums are the largest compartment of the stomach, making up more than 50 percent of the total stomach area. The reticulorumen and omasum account for 35 percent and 14 percent of the total stomach area in the newborn kid. 

Because immature ruminants do not have a functional rumen, feeding recommendations differ for developing ruminants compared with adult ruminants. For instance, it is recommended immature ruminants are not allowed access to feeds containing non-protein nitrogen such as urea. Developing ruminants are also more sensitive to gossypol and dietary fat levels than mature ruminants. 

What Kind of Feed Should be Given to the Ruminants?

Based on the diets they prefer, ruminants can be classified into distinct feeding types:

  • Concentrates selectors,
  • Grass/roughage eaters,
  • and Intermediate types.

The relative sizes of various digestive system organs differ by ruminant feeding type, creating differences in feeding adaptations. Knowledge of grazing preferences and adaptations amongst ruminant livestock species helps in planning a grazing system for each species and also for multiple species grazed together or on the same acreage.

Facts About Sheep

Summary:

The palate is present instead of the upper incisors teeth because it helps to grab grass and also help in regurgitation of feed.

Sheep Farming for Wool Profitability Table

SheepLambs / 3 Per YrSpace Required 20 Sq Feet - EachGrazing Acres .3 / SheepFeed Required / Yr $10015 Lbs Wool / YearAverage Price $ 10 / LB WoolTotal Revenue Possible
1360 sq ft.9 acres$ 30045 lbs$ 450$ 150
26120 sq ft1.80 acres$ 60090 lbs$ 900$ 300
515300 sq ft4.5 acres$ 1,500225 lbs$ 2,250$ 750
1030600 sq ft9 acres$ 3,000450 lbs$ 4,500$ 1,500
20601200 sq ft18 acres$ 6,000900 lbs$ 9,000$ 3,000
30902,700 sq ft27 acres$ 9,0001,350 lbs$ 13,500$ 4,500
401204800 sq ft36 acres$ 12,0001,800 lbs$ 18,000$ 6,000
501503,000 sq ft45 acres$ 15,0002,250 lbs$ 22,500$ 7,500
1003006,000 sq ft90 acres$ 30,0004,500 lbs$ 45,000$ 15,000
20060012,000 sq ft180 acres$ 60,0009,000 lbs$ 90,000$ 30,000
Sheep can give Birth 6+ lambs every Two Years
Sheep can Produce 2 - 30 lbs of wool per year depending on Breed
Raw washed Wool Runs $ 6 - $ 14 using average $ 10
Feed 5 Months Buying Hay $ 100 rest Grazing
Please Check my Numbers

Sheep Farming for Milk Profitability Table

SheepLambs / 3 Per YrSpace Required 20 Sq Feet - EachGrazing Acres .3 / SheepFeed Required / Yr $100Wool $ 15 lb / YearAverage Price $ 10 / LB Wool90 Gallon/ Yr each ewePrice $ 30 per GallonTotal Wool Revenue PossibleTotal Revenue Milk and Wool
1360 sq ft.9 acres$ 30045 lbs$ 4502708100$ 1508,250
26120 sq ft1.80 acres$ 60090 lbs$ 90054016,200$ 30016,500
515300 sq ft4.5 acres$ 1,500225 lbs$ 2,250135040,500$ 75041,250
1030600 sq ft9 acres$ 3,000450 lbs$ 4,500270081,000$ 1,50082,500
20601200 sq ft18 acres$ 6,000900 lbs$ 9,0005400162,000$ 3,000165,000
30902,700 sq ft27 acres$ 9,0001,350 lbs$ 13,5008100243,000$ 4,500247,500
401204800 sq ft36 acres$ 12,0001,800 lbs$ 18,00010,800324,000$ 6,000330,000
501503,000 sq ft45 acres$ 15,0002,250 lbs$ 22,50013,500405,000$ 7,500412,500
1003006,000 sq ft90 acres$ 30,0004,500 lbs$ 45,00027,000810,000$ 15,000825,000
20060012,000 sq ft180 acres$ 60,0009,000 lbs$ 90,00054,0001,620,000$ 30,0001,650,000
Sheep can give Birth 6+ lambs every Two Years
Sheep can Produce 1/2 Gallon Milk per day / 180 Day Lactation
Raw Sheep Milk $9 - $25 per Quart - Used $ 30 per Gallon for Table
Feed 5 Months Buying Hay $ 100 rest Grazing
Please Check my Numbers

18 Breeds of Hair Sheep FAQ Table

Hair Breeds of SheepCountry OriginPurpose of BreedUseEwe Weight
KatahdinsCaribbean / Maine / AfricaTo Graze Power lines / instead of ChemicalsMeat120 - 160 lbs
DorperSouth AfricaThrive in Africa / Hot ClimateMeat / Fast Growing230 LBs
BlackbellyAmericaHot ClimatesMeat150 LBs
St. CroixCarribeanCame on Ships for Meat for sailorsMeat150 lbs
RomanovsRussiaPrimarily for MeatMeat
Wool - Double Coated
110 lbs
Blackhead PersianAfrica / SomailaBred for High Quanity of FatMeat120 lbs
West African DwarfSouth / Central AfricaMeat55 lbs
Red MaasiEast AfricaBred for Hardiness and parasite ResistanceMeat77 Lbs
Wiltshire HornEngland Do not suffer from FlystrikeMeat149 lbs
Royal WhiteUnited States / TexasBred for Tender Meat and Disease ResistantsMeat175 lbs
California RedNot completely Hair sheep/ Combination of both/ Prod 2 lambs YrMeat140 lbs
DamaraEgyptVigorous with fast growing / in extreme conditionsMeat110 lbs
PelibueyCuba / MexicoTropical SheepMeat75 lbs
AfricanaColumbia / VenezulaMeat110 lbs
MoradaBrazilSurvive ScrubMeat66 lbs
Brazillian SomailaSouth Africa / SomaliMeat
UdaAfricaLong Legged SheepMeat88 lbs
TouabireAfrica Dairy / Meat77 lbs
Breeds - Origin - Purpose - Weight

Minature Breeds of Sheep

BreedHeightWeight / Full GrownFood Per DayLifespanWool / Hair SheepCost
Quessant Sheep!8"28 - 30 Lbs1/2 - 1lb 10 - 12 YrsWool$ 350 - 450
Baby Doll Southdown18"75 lbs2 - 3 Lbs10 - 12 YrsWool$ 350 -450
Southdown Sheep18" - 24"130 lbs6 - 6 lbs10 - 12 YrsWool$ 180 - $ 600
Cheviot Sheep 20"130 Lbs6 - 6 lbs10 - 12 YrsWool$ 180 - $ 600
Border Cheviot20"130 lbs6 - 6 lbs10 - 12 YrsWool$ 180 - $ 600
Shetland Sheep24"75 - 100 lbs6 - 6 lbs10 - 12 YrsWool$ 50 - $100
Navajo - Churro20"110 lbs6 - 6 lbs10 - 12 YrsWool$ 200
Breed of Sheep and Physical Charistics
Amount of Food they Need
Lifespan
Wool - They Need to be Sheared Hair Sheep - Do not Grow Woll but shed Hair once a year
Pricing Depend whether you just want Sheep Or you want to Breed

Toxic Plants for Sheep Pastures

Toxic / Poisonous Plant Symptoms / Characteristics
Garden IrisRoots and stems
HollyBerries - Diarrhea - vomiting - stupor
Morning Gloryhallucinogenic seeds
RhubarbLeaves - Convulsions and Death
Wild CherryWilted Leaves have Cynaide - Convolusions, Rolling Eyes, Tongue hanging, animal dies within hours
YewNeedle Like Shrub - vomiting, convulsions, animals Rarely survive this poisoning
OaksAcorns, young trees - anorexia, constipation diahreah thirst gastro problems
Mountain LaurelSame symptoms of Poiaoning. Vomiting, Diahreah, salivation - Usually fall into Coma and then Death
RhododendronSame symptoms of Poiaoning. Vomiting, Diahreah, salivation - Usually fall into Coma and then Death
AzaleaSame symptoms of Poiaoning. Vomiting, Diahreah, salivation - Usually fall into Coma and then Death
List of Poisonous / Toxic Plants
many of these are found around Fence Rows
Fields Should be Checked

Sheep Associations 10 Breeds of Sheep

Breeds of SheepCountry OriginPurpose of BreedUseEwe WeightAssociation For Info
Suffolk SheepBritian / SuffolkFast GrowingMeat250 - 350 LbsUnited Suffolk Sheep Association
Merino SheepSpainSoftest WoolWool100 - 200 LbsAmerican and Delane Merino Sheep Association
HampshireBritainBest Tasting MuttonWool / Meat200 LbsAmerican Hampshire Sheep Association
RomneyEngland / Romney MarshDisease ResistanceWool / Meat225 - 275 LbsAmerican Romney Breeders Association
Lincoln SheepEnglandProduce Longest Fleece In WorldWool250 - 350 LbsNational Lincoln Sheep Breeders Association
Dorper SheepSouth AfricanFast Growing MeatMeat230 LbsAmerican Droper Sheep association
Turcana SheepRomainiaAdapted Alpine PastureWool / Milk / Meat175 - 200 Lbs?
Rambouilette SheepFranceStrong / Hearty / All ClimatesWool / Meat300 LbsAmerican Rambouilette Sheep Breeders Association
Leicester LongwoolUnited KingdomFast growing / Good FleeceWool200 LbsLeicester Longwool Sheep Breeders Association
Breeds - Origin - Purpose - Weight

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