Animal Anatomy and Physiology
Why structure comes first
Every management decision - feeding level, vaccination site, castration age, transport fitness - rests on knowing how an animal is built and how it works. Candidates should be able to name and locate the main organ systems (skeletal, muscular, digestive, respiratory, circulatory, reproductive, nervous, endocrine, urinary, integumentary) and state the function of each in one sentence.
Core concepts to master
- Skeletal system: axial versus appendicular skeleton; functions of bone as support, protection, mineral store and blood-cell factory; the difference between a joint, a ligament and a tendon.
- Digestion: monogastric (simple stomach) versus ruminant (four-compartment stomach: rumen, reticulum, omasum, abomasum) versus hind-gut fermenter (horse, rabbit). Know which species belongs where and why fibre is usable only to fermenters.
- Rumination: the cycle of regurgitation, remastication, reinsalivation and redeglutition; the role of rumen microbes; why abrupt diet change causes bloat and acidosis.
- Reproduction: oestrous cycle stages, site of fertilisation (oviduct), placental attachment, gestation length and the difference between ovulation rate and litter size.
- Homeostasis: thermoregulation (sweating, panting, wallowing, shivering) and how heat stress reduces feed intake and fertility.
Traps examiners set
Questions often swap organs between systems, or ask which compartment of the ruminant stomach is the true glandular stomach (the abomasum). Another common trap is confusing respiration rate with pulse rate, or assuming all farm animals are ruminants. Read the species named in the stem carefully.
Worked rule of thumb
If a question asks how long after service a ruminant's pregnancy can be detected by ultrasound, use the pattern: sheep and goats roughly 30–35 days, cattle roughly 28–35 days, pigs roughly 21–28 days - and remember that early detection saves feed on empty females.
Study tip
Draw a labelled side profile of a cow, a pig and a hen from memory weekly; label ten structures each time. Physiology is best remembered as a chain of cause and effect, not as isolated facts.