Horses Flashcards
Mature male
Stallion
Mature female
Mare
Castrated male
Gelding
Young male
Colt
Young female
Filly
All young
Foal
Parturition
Foaling
Speed determined by
Stride length
Frequency of stride
Were horses self or intentionally domesticated?
Intentionally domesticated
Ferral horses
Mustangs
First horse breed
Arabian
1 hand measurement =
4 inches
How is horse height measured?
Ground to withers
Calm, spook less
Cold blooded
Riding, speed, endurance, active
Hot blooded
Draft
Draught/dray
Cold
16-19h
3,000 or less lbs
Heavy boned/large framed
Power forward movement
Draft example
Belgian
Clydesdale
Shire
Suffolk
Percheron
Light
14.3-17h
1,000-1,500 lbs
Riding
Speed, agility, endurance
Light horse examples
Quarter horse
Arabian
Thoroughbred
Gaited
14.3-17h
1,000-1,5000 lbs
Light and bred for smooth movement and specific footfall pattern
Gated examples
American Saddlebred
Standardbred
Tennessee walking horse
Warmbloods
16-18 h moderate frame
1,200-1,7000 lbs heavy boned
Riding (dressage & jumping)
hot X cold blooded
Warmblood examples
Hanoverian
Dutch Warmblood
Trakehner
Pony
<14.2
500-900 lbs
Bred for draft and riding
Pony examples
Shetland
Welsh
Hackney
Miniature horse
8.5-9.5 h
Small horse conformation
Domestic equids
Draft and riding
Wild equid examples
Zebra
Przewalski’s
Top 4 countries with domestic equids
1) China
2) Russia
3) Mexico
4) US
What causes horse numbers to fluctuate?
Economy- disposable income
Type I
Territorial (solitary)
Type II
Herd bound (social)
Migrate towards rainfall/forage
Animal that survives using speed
Cursorial
Outrun predators
Catch prey
Eyes on front of head
Predators
Eyes on side of head
Prey
Horse eye position and vision range
Eyes on side of head
357° vision
2 blind spots
Long range depth perception
Stereoscopic
Poor short range depth perception
Cornea
Transparent
Protects eye
Bends light
Pupil
Regulates light entering eye
Iris contracts to control light intske
Lens
Blends light to focus it on retina
Accommodation
Ability for lens to change shape to focus light on retina
Close up- round lens
Far away- flat lens
Retina
Light receptors
2 Specialized vision nerves
Rods- low light
Cones- color
Humans have more rods or cones?
Cones
Horses have more rods or cones?
Rods
Trichromic
Humans
Blue- short WL
Green- mid WL
Red- long WL
Dichromic
Horses
Blue- short WL
Earth tones- mid/long WL
Tapetum
Reflective layer behind retina reflects photons to amplify light
Pros to increased limb length
High height- see further
Long stride length. Can ⬆️ speed
Cons to increased limb length
Increased weight - slower
-eliminate excess bone/muscle weight
Higher center of gravity - stability issues
-semi flexible spine
Fusion if tibia/fibula and Radius/ulna
Stride
Flexion: power stroke
Extension: reach for next step
What percent of their bodyweight to horses and cows eat?
1-3%
Horses being a non ruminant herbivore means that they have
Smaller digestive tract
Therefore they eat less food more often. Graze 20 hrs/day
Since horses have a lighter digestive tract, they have more?
Bone and muscle mass
Faster
What 2 physical characteristics allow horses to improve oxygen capacity
Head
Spleen
How does the horses head effect oxygen intake?
Large hollow head for breathing
Esophagus and trachea are separate
How does the horses spleen effect oxygen intake?
Spleen can sort and store and release red blood cells as need to increase hematocrit
What is hematocrit?
Proportion of red blood cells to fluid
Packed cell volume to Serum
Slow contraction
Low efficiency
Limited heat/ friction
Walk
Moderate contraction
Higher efficiency
Moderate work and heat-friction
Ex. Trot, jog
Fast contraction
Low efficiency
High work and heat- friction
Ex. Canter
Conformation
Evaluating the ability to move
Function to form
What does SCID stand for?
Severe combined immunodeficiency
SCID genetics
Severe combined immunodeficiency
Recessive
Up to 40% of horses are carriers
Lethal
Estrous cycle
21 days
Estrus
5-7 days
Ovulation
24-48 hours before estrus ends
Gestation
335 days
Breeding period
Seasonal breeder
Long day
How long does foal heat last
9-14 days post partum
Physiological reasons for low reproduction rate
Long gestation
Seasonal breeders- long day
Single bearing
Take long time to reach puberty/ maturity
Artificial reasons for low reproduction rate
Human impacts
Not bred based on reproduction
Bred for January 1st birthday