Classes of Nutrients

These flashcards cover key concepts related to the classes of nutrients, as discussed in the lecture for Animal Sciences 223.

Nutrition

A series of processes by which an organism takes in and assimilates food for promoting growth, maintenance, and production.

Nutrient

Any chemical compound in the diet that supports physiological functions such as growth, reproduction, and maintenance of life processes.

Essential Nutrient

A nutrient that is crucial for normal body functioning, whose deficiency causes abnormalities.

Food

An edible material that provides nutrients and is commonly used in the context of companion and domesticated farm animals.

Feedstuff

Any material made into or used as food or feed to supply nutrients to an animal.

Macrominerals

Minerals needed in relatively large amounts, such as calcium (Ca), sodium (Na), and potassium (K).

Microminerals

Trace minerals required at lower levels in the body, including selenium (Se), iron (Fe), and zinc (Zn).

Forages

Feeds that stimulate rumination due to their long particle size and high fiber content; examples include hay and silage.

Concentrates

Feeds that are high in energy and low in fiber, usually derived from cereal grains and byproduct feeds.

Feed Efficiency

A measure of how well an animal uses nutrients, indicating the ability to convert feed into body mass or product.

Water

The most critical nutrient, acting as a solvent, a transport medium, and a regulator of body temperature.

Carbohydrates

Organic compounds containing carbon, hydrogen, and oxygen (Cn(H2O)_n) that serve as the primary source of dietary energy.

Lipids (Fats)

Nutrients containing 2.25 times as much energy per gram as carbohydrates, used for energy storage and cell membrane integrity.

Proteins

N-containing molecules composed of amino acids linked by peptide bonds, essential for growth, muscle contraction, and enzyme production.

Vitamins

Organic compounds required in small amounts for specific metabolic functions; classified into fat-soluble and water-soluble types.

Fat-Soluble Vitamins

Includes Vitamins A, D, E, and K; these are soluble in organic solvents and stored in the liver and adipose tissue.

Water-Soluble Vitamins

Includes the B-complex vitamins and Vitamin C; these are not stored in significant amounts and must be supplied regularly.

Monogastric

Animals with a single-compartment stomach, such as pigs, poultry, and humans, where primary chemical digestion occurs.

Ruminant

Herbivores with a four-compartment stomach (rumen, reticulum, omasum, and abomasum) capable of fermenting fibrous plant material.

Gross Energy (GE)

The total amount of energy in a feed, determined by the heat released when the feed is completely oxidized in a bomb calorimeter.

Digestible Energy (DE)

The energy in feed minus the energy lost in feces (GE - \text{Fecal Energy}).

Metabolizable Energy (ME)

Digestible energy minus energy losses in urine and combustible gases (DE - (\text{Urine Energy} + \text{Gas Energy})).

Net Energy (NE)

The actual energy available for maintenance and production after accounting for the heat increment (ME - \text{Heat Increment}).