Large Animal Nursing content is included within the Animal Care & Nursing domain (20%) on the official VTNE. This guide covers equine and bovine nursing, restraint safety, herd health management, biosecurity, and the practical aspects of field anesthesia and sample collection that vet techs handle in large-animal practice.
Tested within the Animal Care & Nursing domain on the official VTNE. On the official VTNE this content appears within Animal Care & Nursing — this guide gives it dedicated focus.
Learn the five key restraint techniques for horses (halter and lead, twitch, chain over nose, stocks, chemical) and the major large-animal vital sign differences from small animals (lower HR, lower RR, higher temp tolerance in cattle). Then memorize common equine emergencies (colic types, laminitis, choke) — these scenario questions appear frequently.
Equine Nursing & Restraint
Normal equine vitals: HR 28–44 bpm, RR 8–16 bpm, Temp 37.5–38.5 °C. Restraint options: halter and lead (light handling), twitch (lip or nose — releases endorphins; humane when used properly, < 10 min), chain over the nose (stronger control), chain under the chin (mild), stocks (maximum control). Approach from the shoulder — never directly from front or rear. Blindfold for additional control.
Bovine & Small-Ruminant Care
Cattle vitals: HR 40–70 bpm, RR 20–30 bpm, Temp 38.5–39.5 °C. Rumen: large fermentation organ; tympany (bloat) can be life-threatening. Head catches (stanchions, squeeze chutes) for cattle. Goats and sheep: smaller, more easily stressed. Sheep: follow-the-herd instinct; move with group, use a dog or flag. Foot trimming common tech duty for ruminants.
Large-Animal Handling Safety
Horses can cause fatal injuries — stand at the shoulder, not behind or directly in front. "Flight zone" — when approached within it, the animal moves away; work at the edge of the flight zone to direct movement without causing panic. Kick zone: semicircle behind hind legs and to the side. Use protective footwear and helmet. Never wrap lead rope around hand.
Common Equine Diseases
Colic: abdominal pain — differentiate by gut sounds (hypermotility in spasmodic; absence in obstruction/strangulation), rectal exam, nasogastric reflux (> 2 L = concern). Laminitis: rotation and sinking of coffin bone — warmth in hoof, digital pulse, shifting weight. Choke: esophageal obstruction — salivation and feed material from nostrils. Strangles: Streptococcus equi — lymph node abscess, nasal discharge.
Common Food-Animal Diseases
Bovine respiratory disease (BRD): most common disease in feedlots — fever, nasal discharge, cough, reduced feed intake. Mastitis: mammary gland infection — California Mastitis Test (CMT) for screening, milk culture for organism ID. Clostridial diseases: vaccination critical (blackleg, enterotoxemia). Foot rot (interdigital necrobacillosis): Fusobacterium necrophorum, foul odor, lameness.
Herd Health & Preventive Medicine
Vaccination protocols by species. Deworming (strategic vs. FAMACHA in small ruminants). Pregnancy diagnosis. Body condition scoring (1–5 cattle scale; 1–9 equine scale). Production records: growth rates, milk production, conception rates. Pre-purchase exams. Age estimation by dentition (horse: wear patterns on incisors).
Biosecurity & Sanitation
Quarantine new arrivals 14–21 days. Separate sick from healthy animals. Disinfectants: dilute bleach (1:32) for routine, glutaraldehyde for parvovirus/parvovirus-level pathogens. Footbaths at barn entrance. Limit farm visitors; maintain visitor log. Report reportable diseases to state veterinarian (anthrax, foot-and-mouth, brucellosis).
Field Anesthesia & Sedation
Standing sedation: xylazine (alpha-2 agonist) ± butorphanol in horses — reversal with atipamezole or yohimbine. Cattle more sensitive to xylazine (1/10 the dose of horses). Short-term field anesthesia: xylazine + ketamine ("Triple Drip" protocol for horses: xylazine + ketamine + guaifenesin). Recovery: quiet environment, padded stall, minimize stimulation. Assist standing if needed.
Nutrition for Large Animals
Horses: hindgut fermenters; high-quality forage (hay) as the base; grain supplementation for high-performance. Water intake: 25–55 L/day (varies with work and temperature). Cattle: ruminants; total mixed ration (TMR) in feedlots. Selenium deficiency: white muscle disease (nutritional muscular dystrophy) — common in certain geographic regions. Salt blocks: electrolyte supplementation.
Sample Collection in the Field
Venipuncture: jugular (most common in horses and cattle), cephalic (horses), tail (coccygeal) vein in cattle. Blood tubes: same as small animal. Urine: free-catch or catheterization (stallions; cows via perineal stimulation). Tracheal wash: for respiratory disease diagnosis. Fecal samples: fresh, rectal collection preferred. Transport: cool box, appropriate tubes, timely delivery.
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Frequently Asked Questions
What are normal vital signs for horses on the VTNE?
Adult horse normal values: heart rate 28–44 bpm, respiratory rate 8–16 bpm, rectal temperature 37.5–38.5 °C (99.5–101.3 °F), gut sounds present in all four quadrants. Foals have higher heart rates (60–100 bpm). These differ significantly from small animals — the VTNE tests that candidates know species-specific ranges.
What is the California Mastitis Test (CMT)?
The CMT is a chairside screening test for bovine mastitis. A reagent is mixed with milk in a paddle; the degree of gel formation indicates somatic cell count and the likelihood of infection. Trace reaction: normal; 1+ to 3+: increasing likelihood of subclinical or clinical mastitis. Positive quarters require milk culture for pathogen identification and sensitivity.
How is xylazine dosing different in cattle vs. horses?
Cattle are approximately 10 times more sensitive to xylazine than horses. A sedative dose in horses (0.5–1.0 mg/kg IV) would cause profound, dangerous sedation or recumbency in cattle. Cattle doses are typically 0.05–0.1 mg/kg IV for sedation. Always confirm species-specific dose before administering alpha-2 agonists in large animals.
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