Animal Nutrition, Feeding, and Digestive Systems

Vocabulary practice flashcards covering animal nutrition, feeding guidelines, nutrient classes, dentition, monogastric, ruminant, hindgut fermenter, and avian digestive anatomy.

Animal Nutrition

The science of determining how animals use food to transform into body tissues and energy based on environment, activity level, age, genetics, and health.

Nutrient

A single class of food or group of like food that aids in the support of life, making it possible for animals to grow or provide energy for physiological processes.

Ration

The specific amount of food an animal needs per day to satisfy its physiological nutrient requirements.

Essential Nutrients

Nutrients that cannot be synthesized by the body in sufficient quantities and must be provided in the diet.

Nonessential Nutrients

Nutrients that can be synthesized by the body and do not necessarily need to be obtained directly from food.

Digestion

The chemical and mechanical breakdown of food into individual nutrients that the body can absorb for energy, growth, tissue repair, and reproduction.

Crown

The region of the tooth located above the gumline.

Root

The portion of the tooth situated below the gumline.

Enamel

The hard outermost layer of the tooth, considered the hardest substance in the body.

Dentin

The second layer of the tooth structure, located directly beneath the enamel.

Pulp Cavity

The innermost layer of the tooth containing nerves, arteries, and blood vessels.

Tooth Anatomy Diagram

Structural breakdown of a tooth showing the crown, root, enamel, dentin, pulp chamber, root canal, cementum, periodontal ligament, and apical delta.

Dentition

The arrangement, type, and number of teeth present in an animal species.

Incisors

Front teeth used primarily to bite and grasp food.

Canines

The longest and sharpest teeth in the mouth, used to tear food apart.

Premolars

Wider teeth positioned between the canines and molars used to crush or grind food.

Molars

Large back teeth used to grind down food particles for digestion.

Papillae

Hair-like projections on the surface of the tongue that act as tastebuds.

Mucosa

A thin lining of connective tissue lining the gastrointestinal tract that facilitates the smooth passage of food.

Peristalsis

Wave-like muscle contractions and motions that move ingested food through the gastrointestinal tract.

Monogastric Digestive System

A digestive system featuring a simple, single-chambered stomach, found in species such as humans, dogs, cats, and pigs.

Pig Monogastric System Diagram

Anatomical representation of a pig's monogastric digestive system showing the mouth, esophagus, stomach, small intestine, cecum, and large intestine.

Cardia

The entrance region of the stomach that connects to the esophagus and includes the fundus.

Pylorus

The exit passage of the stomach that opens into the small intestines.

Bile

A digestive fluid secreted by the liver to assist in the digestion and absorption of fats and nutrients.

Amylase

A pancreatic enzyme responsible for digesting starches.

Trypsin

A digestive enzyme produced by the pancreas that breaks down proteins.

Lipase

A pancreatic enzyme that breaks down lipids and fats.

Ruminant Digestive System Diagram

Anatomical model illustrating the four-chambered stomach system (rumen, reticulum, omasum, abomasum) in animals like cattle, sheep, and goats.

Cud

A regurgitated mixture of grass, hay, and saliva chewed again by ruminants to further break down plant fiber.

Regurgitation

The process of bringing swallowed food back up into the mouth from the stomach for additional mastication.

Eructation

Belching caused by gas buildup in the rumen as ruminants chew with open mouths, allowing air into the fermentation chamber.

Rumen

The largest compartment of the ruminant stomach, comprising $80\%$ of its volume, which functions as a large microbial fermentation vat.

Reticulum

The honeycomb-textured stomach compartment comprising $5\%$ of the ruminant stomach that catches foreign objects and non-digestible items for regurgitation.

Omasum

The stomach compartment comprising $8\%$ of the ruminant stomach that absorbs water and nutrients while grinding roughage and grains.

Abomasum

The fourth compartment comprising $10\%$ of the ruminant stomach, known as the 'true stomach' where acidic and enzymatic digestion occurs.

Hindgut Fermenter Digestive System Diagram

Digestive layout characteristic of non-ruminant herbivores like horses and rabbits, featuring a single-chambered stomach and an enlarged, functional cecum.

Cecotrophs

Nutrient-dense soft fecal pellets re-ingested by rabbits and other hindgut fermenters to absorb recycled protein, minerals, and B vitamins.

Avian Digestive System Diagram

Anatomical schematic showing specialized bird digestive organs including the crop, proventriculus, gizzard, duodenal loop, ceca, and cloaca.

Crop

An expandable storage pouch in the avian esophagus used to temporarily hold and soften food.

Proventriculus

The glandular 'true stomach' of birds where chemical, acidic, and enzymatic digestion begins.

Gizzard

A thick muscular organ in birds containing ingested grit that mechanically grinds down coarse food particles.

Cloaca

The common terminal chamber in birds for the intestinal, urinary, and reproductive tracts.

Vent

The external anatomical opening of the avian cloaca.

Proteins

Large complex molecules constructed from chains of amino acids that are vital for normal tissue growth, structural repair, maintenance, and lactation.

Taurine

An essential amino acid required by cats; deficiency causes blindness, reproductive failure, or dilated cardiomyopathy.

Carbohydrates

The primary source of energy making up approximately $75\%$ of an animal's diet, composed of starches, sugars, and digestible or indigestible fibers.

Kilocalories

A unit of measure defining the amount of energy required to raise the temperature of $1\,\text{gram}$ of water by $1^\circ\text{C}$.

Linoleic Acid

An essential fatty acid required in the diets of both dogs and cats for normal skin and coat health.

Arachidonic Acid

An essential fatty acid specifically required by cats that must be derived directly from animal fats.

Fat-Soluble Vitamins

Vitamins A, D, E, and K, which are absorbed and transported alongside dietary fats and stored in body tissue.

Water-Soluble Vitamins

Vitamins B and C, which dissolve in water and are not stored extensively within body tissues.

Macro-minerals

Major minerals required in larger quantities, including Calcium (Ca), Phosphorus (P), Magnesium (Mg), Potassium (K), Sodium (Na), and Chlorine (Cl).

Trace Minerals

Micro minerals required in minute concentrations, including Iron (Fe), Copper (Cu), Zinc (Zn), Manganese (Mn), Iodine (I), Cobalt (Co), Selenium (Se), and Fluorine (F).

Dehydration

The excessive loss of body water, where a loss of $20\%$ total water content can prove fatal.

Dog Body Condition Scale

A 5-point evaluation scale classifying dogs from 1 (Severely Underweight) to 5 (Obese), with 3 representing Ideal Weight.

Cat Body Condition Scale

A 9-point evaluation system for cats grading body mass from Very Thin (1) to Ideal (5) to Obesity (9).

Feline Anorexia

A condition where a cat refuses food; if persistent for $3\text{ to }4\text{ days}$, it leads to hepatic lipidosis (liver failure) due to severe protein deprivation.

Large Breed Puppy Food

A diet formulation designed for large breed dogs containing reduced caloric density and controlled calcium levels to regulate rapid skeletal growth.