Comprehensive Study Notes: Small Ruminants & Canine Breed Science

Small Ruminant Agriculture: Sheep & Goat Overview

• Origins & Agricultural Significance:

  • Domestic sheep and goats originated in Europe and cooler regions of Asia.

  • They serve an essential role in both temperate and tropical agricultural systems globally.

  • Primary livestock yields include fibers, milk, meat, and hides.

  • Their versatility and high efficiency make them especially critical in developing countries.

• Dairy & Cheese Production:

  • Feta cheese: Produced in Greece, Italy, and France.

  • Sheep Ricotta and Pecorino Romano: Produced in Italy.

  • Roquefort cheese: Produced in France.

Goat Breeds & Classifications

• Primary Functional Classifications:

  • Common Meat Breeds: Boer, Spanish, Pygmy.

  • Common Dairy Breeds: French Alpine, LaMancha, Nubian, Saanen, Toggenburg, Oberhasli.

  • Common Fiber Breeds: Angora, Cashmere.

• Detailed Profiles of Dairy Goat Breeds:

  • Toggenburg (Switzerland):

    • Size & Coat: Medium in size; coat is short or medium in length; solid color varying from light fawn to dark chocolate, featuring distinct white markings.

    • Facial Features: Ears are erect and carried forward; facial profile is straight or dished; animals are usually polled.

  • French Alpine (French Alps):

    • Size & Coat: Medium to large framed; short to medium hair length; displays all colors and color combinations, including pure white, black, fawn, brown, gray, buff, and red.

    • Facial Features: Straight face profile with a Roman nose; occurs in both polled and horned varieties.

  • Golden Guernsey (Channel Island, British):

    • Coat & Characteristics: Coat color varies from cream to brown; usually polled.

    • Milk Performance: Produces a lower overall volume of milk compared to most Swiss breeds, but yields a higher percentage of butterfat and protein.

  • Saanen (Switzerland):

    • Production: Average butterfat yield is $3\text{--}4\%$; known as the "Queen of dairy goats." Highly popular in commercial U.S. dairies due to high milk production volume.

    • Physical Traits: Medium to large in size; white or light cream in color; ears are erect and carried forward; face is straight or dished.

    • Behavioral Traits: High vitality, excellent herd compatibility, and docile temperament.

*   **Nubian (Africa):**
    *   *Size & Coat:* Large-framed body; mostly polled; coat displays any color or color pattern, including solid or patterned black, gray, cream, white, tan, and reddish brown.
    *   *Facial Features:* Distinctive convex facial profile between the eyes and muzzle (Roman nose); long, wide, and pendulous ears.
    *   *Milk Traits:* Milk is significantly higher in protein and butterfat compared to other dairy breeds.
*   **LaMancha (Oregon, USA):**
    *   *Physical Traits:* Face is straight; coat is short, fine, and glossy in any color or color combination; yields high butterfat milk.
    *   *Ear Types:* Ears are so small the animal appears earless:
        *   *Gopher Ear:* Maximum length of $1\,\text{inch}$, with non-existent cartilage preferred.
        *   *Elf Ear:* Maximum length of $2\,\text{inches}$, with the tip turned upward or downward.

• Detailed Profiles of Meat & Fiber Goat Breeds:

  • Angora (Angora, Turkey):

    • Physical Traits: Solid white coat; both sexes are horned (some polled individuals exist), featuring a pronounced spiral horn shape.

    • Fiber Yield: Raised for Mohair (a silky textile spun from the hair); kid fleece holds the highest economic value; yields $6\text{--}7\,\text{lbs/year/head}$ of fiber.

*   **Boer / Africander (South Africa):**
    *   *Physical Traits:* Large-framed, early-maturing meat breed; standard color is a white body with a red head and white facial blaze; usually horned.
    *   *Reproduction:* Highly fertile, averaging approximately $3$ kiddings every $2\,\text{years}$.

*   **Nigerian Dwarf (West Africa):**
    *   *Characteristics:* Main coat colors are black, chocolate, and gold with random white markings; breeds year-round; excellent companion animals.
    *   *Production:* Yields $3\text{--}4\,\text{lbs}$ of milk per day testing at $6\text{--}10\%$ butterfat.
*   **Pygmy Goat (French Cameroon, Africa):**
    *   *Appearance:* Full coat of straight, medium-long hair; all colors accepted; accent tones lighter than the body cover the muzzle, forehead, eyes, and ears. Females have no beard (or a sparse/trimmed beard), while males possess full beards.
    *   *Registry Standards:* Polled animals are explicitly NOT accepted by the breed registry; raised for meat, milk, and pets.
*   **Cashmere Goats:**
    *   *Fiber Traits:* Yields luxurious cashmere fleece consisting of fine cashmere undercoat and coarse guard hair; full-grown adult bucks produce up to $2.5\,\text{lbs}$ of fleece per annual shearing.
    *   *Industry & Housing:* China produces $60\%$ of the global cashmere supply; the U.S. industry began in the 1980s. Cashmere goats are easy to raise and contain (non-jumpers, requiring standard woven wire sheep fencing). Dual-layer coat provides cold weather insulation and sheds in summer, requiring minimal shelter.

Distinctive & Rare Goat Breeds

• Markhor Goat (Himalayas):

  • Classification: Wild goat-antelope species of the Himalayan region.

  • Dimensions: Shoulder height ranges from $65\text{--}115\,\text{cm}$ ($26\text{--}45\,\text{inches}$); body weight ranges from $40\text{--}110\,\text{kg}$ ($88\text{--}240\,\text{lbs}$).

  • Horns: Both sexes have corkscrew-shaped spiral horns; male horns reach up to $160\,\text{cm}$ ($63\,\text{inches}$) long, while female horns reach up to $25\,\text{cm}$ ($9.8\,\text{inches}$).

  • Pelage: Males display long, shaggy white fur on the neck and chest growing down to knee length.

• Irish Goat (Ireland):

  • Background: Oldest breed native to Ireland; used for meat, milk, and skin.

  • Traits: Nimble-footed on steep crags and cliffs; coat is a mixture of gray, black, and brown; both sexes possess horns (larger in males).

• Valais Blackneck (Southern Switzerland):

  • Traits: Distinctive color pattern with black forequarters and white hindquarters; features long, curly hair and large, long horns; utilized for meat and milk.

Sheep Breeds & Classifications

• Wool & Functional Classifications:

  • Fine Wool Breeds (FWB): Emphasis on quality fleece (Merino, Rambouillet).

  • Medium Wool Breeds (MWB): Emphasis on carcass meat quality (Cheviot, Corriedale, Dorset, Finnish Sheep, Hampshire, Montadale, Oxford, Polypay, Romanov, Shropshire, Southdown, Suffolk).

  • Long Wool Breeds (LWB): Large breeds producing long, coarse fiber (Cotswold, Leicester, Lincoln, Romney).

  • Crossbred Wool Breeds: Produced by crossing fine-wool and long-wool genetics (Columbia).

  • Hair Type / Shedding Breeds: Shear-free hair sheep raised for meat (Barbado, Barbados Blackbelly, Painted Desert, Black Hawaiians, Texas Dallas).

  • Meat Breeds: Dorset, Dorper, Hampshire, Suffolk, Jacob.

  • Dairy Breeds: East Friesian.

• Detailed Profiles of Sheep Breeds:

  • Barbado (Texas, USA):

    • Genetics & Origin: Originated in Texas from a cross between Barbados Blackbelly sheep and Rambouillet.

    • Physical Traits: Short hair to coarse wool coat; color is tan, tan with a pale or black belly, or pied. Males are horned, while females are polled.

    • Usage: Raised for meat, hair, and hunting preserves; meat is lean without a strong mutton flavor.

  • Cheviot (Scotland - MWB):

    • Appearance: White-faced sheep with a wool-free face and legs; erect, pricked ears; black muzzle, black nostrils, and black hooves.

    • Fleece & Health: Durable wool with a helical crimp; high lambing ease and strong mothering instincts; resistant to cold climates, worms, and footrot.

  • Dorset (Southern England - MWB / Meat):

    • Popularity: Most popular white-faced breed in the United States (second most popular overall behind Suffolk).

    • Physical Traits: White face, ears, legs, and pink skin, with wool on head and legs; exists in both horned and polled varieties.

    • Performance: Produces high milk volume alongside excellent meat quality and quantity.

  • Columbia (USDA, USA - Crossbred / MWB):

    • Development: Developed by the USDA crossing long-wool breeds with high-quality Rambouillet genetics to thrive on Western range lands.

    • Yields: Produces medium wool and large amounts of meat.

  • Corriedale (New Zealand & Southern England - MWB):

    • Global Status: Extremely popular globally; stands as the most popular breed in South America.

    • Traits: White face, ears, legs, and wool cap on head/legs; yields bulky, high-density wool and meat.

  • Hampshire (Hampshire, England - MWB / Meat):

    • Appearance: Medium-sized, rapid-growing breed; polled; black face, nose, and legs; skin tone varies due to crossbred culture origins.

    • Production: Mild demeanor; produces medium wool; prized for delicious mutton; high rate of multiple births.

  • Suffolk (England - MWB / Meat):

    • Popularity: The most popular sheep breed in the United States.

    • Appearance: Large frame; white wool body with bare black face, bare black legs, and droopy ears; polled.

    • Purpose: Dominant market lamb sire producing heavy meat yields.

  • Merino (Spain - FWB):

    • Production & Status: Premium fine-wool breed; most popular sheep breed in Australia.

    • Physical Traits: White face and legs, white wool on head/legs, pale skin; rams are horned, while ewes are polled.

    • Wool Quality: Yields world-renowned fine fleece used for spinning baby clothes, shawls, and warm garments (unsuited for heavy daily wear).

*   **Rambouillet (France - FWB):**
    *   *Genetics:* Developed in France from Spanish Merino genetics.
    *   *Appearance:* Large, angular body shape; white face/legs, pale skin, wool cap on head and legs; ewes are polled, whereas rams occur in horned and polled forms.
*   **Lincoln (England - LWB):**
    *   *Size & Production:* Largest sheep breed, weighing between $260\text{--}350\,\text{lbs}$.
    *   *Physical Traits:* Polled; white face and legs; features a pronounced forelock between the ears and wool that forms long ringlets.

Distinctive & Rare Sheep Breeds

• Manx Loaghtan (Isle of Man):

  • Characteristics: Rare, short-tailed, multi-horned breed with dark brown wool; individuals feature up to $6$ horns (larger in males). Both meat and fleece are highly prized.

• Navajo-Churro Sheep / Churro (USA):

  • Background: Also called American or Navajo Four-Horned Sheep.

  • Traits: Renowned for lean meat, disease resistance, hardiness, low maintenance, and adaptability to climate extremes.

Canine Taxonomy & Kennel Club Registration

• Species vs. Breed Definitions:

  • Species: Biological classification where individuals from different species cannot produce fertile offspring when mated (e.g., dog, cat, horse, cattle).

  • Breed: Domestically selected group whose members reproduce true-to-type when mated like-to-like (e.g., Beagle, Labrador Retriever, Vizsla).

• The American Kennel Club (AKC):

  • Role: Primary registry of purebred dog pedigrees in the United States; establishes standardized development pathways for new breeds prior to stud book inclusion.

  • Sanctioned Events: Westminster Kennel Club Dog Show, National Dog Show, AKC Eukanuba National Championship.

• AKC Categorization Framework:

  • Official Breeds: Recognizes $184$ purebred dog breeds structured into $7$ primary functional groups.

  • Miscellaneous Class: An $8\text{th}$ designated group reserved for emerging breeds undergoing official recognition (currently contains $11$ breeds).

    • Criteria for Miscellaneous Status: Requires an active national parent club, established breeding history, and sustained nationwide interest across broad geographic areas.

    • Status Progression: Breeds in the Miscellaneous Class cannot earn championships in regular AKC sanctioned show events until the AKC Board of Directors approves full breed status.

AKC Breed Groups & Characteristics

• 1. Sporting Group ($30$ Breeds):

  • Traits: Well-rounded, friendly, active, intelligent, and easily trained.

  • Management Requirements: Require daily physical exercise and mental engagement (e.g., fetching, swimming).

  • Functional Subtypes:

    • Pointers: Locate game and silently point to signal location.

    • Retrievers: Retrieve downed game across land or water terrain.

    • Spaniels: Flush hidden game out of dense brush/cover.

    • Setters: Locate, point, and flush game birds.

    • Additional Group Members: Includes Vizsla and Weimaraner.

• 2. Hound Group ($29$ Breeds):

  • Functional Purpose: Developed specifically for scent tracking or visual hunting.

  • Behavioral Traits: Strong impulse to follow scents ("follow their nose"); many exhibit a prolonged vocalization known as "baying" (a key noise consideration for pet owners).

  • Non-Named Hounds: Saluki, Petit Basset Griffon Vendéen (PBGV), Borzoi, Dachshund, Basenji, Beagle, Whippet, Rhodesian Ridgeback.

  • Sight Hounds Special Concerns:

    • Lean body mass with minimal subcutaneous fat.

    • Intense prey chase drive (often unsafe around smaller domestic pets).

    • High physiological sensitivity to chemical anesthesia.

• 3. Working Group ($30$ Breeds):

  • Functional Purpose: Bred for property guarding, sled pulling, draft hauling, or water rescue.

  • Physical & Behavioral Profile: Large to giant body size, exceptional physical strength, highly intelligent, and quick to learn.

  • Management Requirements: Mandatory early obedience training and socialization; raw size and strength make many breeds inappropriate for inexperienced owners or average family households.

  • Representative Breeds: Akita, Boxer, Bullmastiff, Doberman Pinscher, Giant Schnauzer, Great Dane, Great Pyrenees, Komondor, Mastiff, Neapolitan Mastiff, Rottweiler, Saint Bernard, Siberian Husky, Tibetan Mastiff.

• 4. Herding Group ($29$ Breeds):

  • Organizational History: Established in 1983 after reassignment from the Working Group.

  • Core Abilities: Instinctive ability to control and direct the movements of other animals.

  • Pet Dynamics: Herding drive prompts dogs to herd human family members and young children; highly responsive to structured training activities.

  • Representative Breeds: Australian Cattle Dog, Australian Shepherd, Border Collie, Cardigan/Pembroke Welsh Corgi, Collies, German Shepherd Dog, Old English Sheepdog, Shetland Sheepdog.

• 5. Terrier Group ($30$ Breeds):

  • Functional Purpose: Exclusively bred to hunt and kill vermin/small animals without exception.

  • Temperament & Size: Energetic, tenacious, feisty, and bold; ranges in size from small earth-dogs up to the large Airedale Terrier.

  • Representative Breeds: Airedale Terrier, Bull Terrier, Cairn Terrier, Jack Russell Terrier, Kerry Blue Terrier, Scottish Terrier, West Highland White Terrier.

• 6. Toy Group ($21$ Breeds):

  • Functional Purpose: Bred primarily as companion pets, lap warmers, and status symbols ("embody sheer delight").

  • Management Profile: Fits well in small apartments; low environmental space demands; variable grooming needs (some coats require extensive care).

  • Behavioral Traits: Can be fragile and snappy when handled roughly; generally unsuited for households with toddlers or small children.

  • Representative Breeds: Chihuahua, Chinese Crested, Italian Greyhound, Maltese, Miniature Pinscher, Papillon, Pekingese, Pomeranian, Pug, Shih Tzu, Toy Poodle, Yorkshire Terrier.

• 7. Non-Sporting Group ($20$ Breeds):

  • Classification Criteria: Catch-all category for breeds possessing specialized or diverse functions that do not align with other primary groups.

  • Representative Breeds: Boston Terrier, Bulldog, Chow Chow, Dalmatian, French Bulldog, Keeshond, Lhasa Apso, Poodle (Standard/Miniature), Shiba Inu, Chinese Shar-Pei.

• 8. Miscellaneous Class ($11$ Breeds):

  • Status: Transitional group for developing breeds building stable breeding populations across the country.

Purebreds, Hybrids, & Designer Dogs

• Purebred Dogs:

  • Definition: Animals produced by mating two purebred parents of the exact same recognized breed.

  • Genetic Outcome: Offspring consistently breed true-to-type in temperament, anatomical structure, and physical coat traits.

• Hybrid ("Designer") Dogs:

  • Definition: First-generation crossbred offspring resulting from two distinct purebred parent breeds.

  • Common Designer Examples:

    • Pug + Beagle = Puggle

    • Poodle + Labrador Retriever = Labradoodle

    • Chihuahua + Dachshund = Chiweenie

    • Schnauzer + Poodle = Schnoodle

  • Genetic Misconceptions:

    • Crossbreeding two purebreds does not guarantee a predictable 50/50 blend of desirable traits; offspring may inherit problematic behavioral or physical traits from both parents (e.g., Chihuahua feistiness in a Mastiff frame).

    • Mating two hybrids together (e.g., Puggle to Puggle) does not yield consistent purebred offspring.

  • Establishing a New Pedigreed Breed: Requires multi-generational selective breeding of crossbred stock to establish true-breeding standards, lineage records, and pedigree registries over many years.

Breed-Specific Canine Medical Conditions

• Brachycephalic Airway Syndrome & Associated Traits:

  • Anatomical Definition: Flat, pushed-in facial structure, snub nose, short skull, and lower jaw underbite.

  • Skull Types:

    • Brachycephalic: Shortened anteroposterior skull axis (e.g., Bulldog, Pug).

    • Mesaticephalic: Intermediate skull length ratio (e.g., Golden Retriever, German Shepherd).

    • Dolichocephalic: Elongated skull and nasal structure (e.g., Greyhound, Collie).

*   *Affected Breeds:*
    *   *Canine:* Bulldog, French Bulldog, Boxer, Pug, Shih Tzu.
    *   *Feline:* Persian, Himalayan, Exotic Shorthair.
*   *Clinical Pathologies:*
    *   Stenotic nares (narrowed nostrils) and overlong soft palates restricting airflow.

    *   Poor thermoregulation, making animals prone to heat-related illnesses in warm climates.
    *   Severe dental overcrowding and malocclusions causing mastication difficulties.
    *   Disproportionately wide heads relative to maternal pelvic width, requiring surgical Caesarean section (C-section) delivery of litters.

• Surgical Ear Cropping:

  • Definition: Elective cosmetic surgical amputation of pinnae to force ears into an upright stance.

  • Medical Value: Purely aesthetic with zero physiological or health benefits; historical breed standard requirement for show ring presentation.

*   *Breed Standards for Remaining Ear Tissue:*
    *   Schnauzer: $\frac{2}{3}$ of pinna retained.
    *   Boxer: $\frac{2}{3}\text{--}\frac{3}{4}$ of pinna retained.
    *   Doberman Pinscher: $\frac{3}{4}\text{--}\frac{7}{8}$ of pinna retained.
    *   Great Dane: $\frac{3}{4}$ of pinna retained.
    *   Miniature Pinscher: $\frac{2}{3}\text{--}\frac{3}{4}$ of pinna retained.
    *   Boston Terrier: $\frac{3}{4}$ of pinna retained.
    *   Staffordshire Bull Terrier: $\frac{3}{5}$ of pinna retained (distinct from "fighting cuts").

• Hip Dysplasia:

  • Pathology: Malformation or progressive degeneration of the coxofemoral (hip) joint and acetabulum, leading to osteoarthritis, severe pain, and hindlimb lameness.

  • High-Risk Breeds: Large and giant breeds, specifically German Shepherd Dogs, Labrador Retrievers, and Golden Retrievers.

• Intervertebral Disc Disease (IVDD):

  • Pathology: Herniation, rupture, or degeneration of intervertebral discs compressing the spinal cord, causing debilitating back pain and potential paralysis.

  • High-Risk Breeds: Long-backed, chondrodystrophic breeds, particularly Dachshunds; risk increases significantly with obesity.

• Extremity Bone Fractures:

  • Pathology: Long, slender limb bones susceptible to traumatic fractures from mild or casual impact.

  • High-Risk Breeds: Italian Greyhound, Whippet (unsuited for homes with active young children).

• Gastric Dilatation-Volvulus (GDV / "Bloat"):

  • Pathology: Acute distension of the stomach with gas/fluid followed by rotation along its longitudinal axis, cutting off blood supply; rapidly fatal without immediate emergency surgery.

  • High-Risk Breeds: Large, deep-chested breeds (e.g., Great Dane, German Shepherd Dog, Mastiff).

• Ophthalmic Entropion:

  • Pathology: Inward rolling of the eyelid margins, causing eyelashes and fur to scrape the cornea, resulting in severe pain, corneal ulceration, and potential blindness.

  • High-Risk Breeds: Chinese Shar-Pei (genetically predisposed; often requires corrective ophthalmic surgery).

• Behavioral Property Destruction:

  • Root Cause: High-drive working/sledding dogs (e.g., Siberian Husky, Alaskan Malamute) subjected to inadequate physical exercise and environmental stimulation; manifests as destructive chewing, digging, chronic barking, and home destruction.

• Congenital Sensory Deficits (Deafness & Blindness):

  • Etiology: High genetic risk in dogs displaying all-white coats paired with blue eyes; results from pleiotropic gene linkage affecting auditory/visual organ development.

  • High-Risk Breeds: Australian Shepherds, Boxers.

• Additional Breed-Specific Pathologies:

  • Chronic Otitis Externa (Ear Infections): Cocker Spaniels, Labrador Retrievers, Golden Retrievers.

  • Atopic Dermatitis (Skin Allergies): West Highland White Terriers ("Westies"), "Pit Bulls".

  • Dilated Cardiomyopathy (Heart Disease): Boxers, Doberman Pinschers.

  • Severe Periodontal Disease: Toy and small breed dogs.

  • Classification Note: "Pit Bulls" are not a recognized AKC breed entity.