Fundamentals of Livestock Nutrition: Feed & Feedstuffs

Livestock Feed

Any material given to livestock to meet their nutritional requirements.

Nutrients

Components found in feed that provide necessary elements for physiological and metabolic processes, including water, carbohydrates, lipids, protein, vitamins, and minerals.

Ration

A mixture of feedstuffs supplied to an animal in a 24-hour period to provide the proper amount of nutrients for development and growth.

Roughages

Plant-based feedstuffs high in fiber, such as hay or silage, essential for maintaining microbial activity in the rumen of ruminants.

Concentrates

Feedstuffs high in energy and/or protein, complementing roughages in providing required nutrients to livestock.

Monogastrics

Animals with a simple stomach that lack rumen and microbes, unable to digest cellulose and hemicellulose but can digest sugars, starches, lipids, proteins, vitamins, and minerals.

Preserved Roughages

Plant materials like hay and silage mechanically harvested and stored to preserve nutrient content for year-round availability.

Crop Residues

Roughages remaining after harvesting crops, such as husks, straw, and stover, used as a low-cost source of roughages for livestock.

Fresh Roughages

Plant material given to animals as found in the environment without any preserving processes applied.

Dry Roughages

Plant material with approximately 90% dry matter, like hay, provided to livestock for their nutritional needs.

Concentrate Feed

A feed rich in nutrients, such as energy (e.g., carbohydrates) or protein (e.g., amino acids), used to provide digestible energy and protein sources in livestock diets.

Rumen

The first compartment of the stomach in ruminant animals where microbial fermentation of feed, especially concentrates, occurs.

Bloat

An indigestion issue in ruminants caused by excessive gas accumulation due to rapid microbial fermentation of concentrates, leading to a swollen abdomen and potential death if not treated promptly.

Acidosis

A condition resulting from the rapid fermentation of carbohydrates in the rumen, causing an acidic environment that can damage rumen microbes and papillae, leading to decreased animal performance or death.

Feed Processing

The alteration of feed commodities to optimize their utilization by animals, including grinding, rolling, pelleting, or steam flaking, to increase palatability, nutrient availability, and storage time of feeds.

Dry processing methods

Techniques such as rolling, cracking, and crimping used in concentrates to alter the physical properties of grains.

Roller mills

Machines that use compression to break or flatten grains by passing them through two rollers turning in opposite directions.

Wet feed processing

Method involving the addition of moisture, heat, and pressure to ingredients, commonly used in pelleting and steamrolling/flaking.

Pelleting

Process of converting finely ground feed into dense pellets or capsules through steam injection and mechanical pressure to enhance digestibility and nutritional balance.

Steamrolling/flaking

Technique where grains are exposed to hot moisture or steam to increase starch availability and alter the chemical and physical properties of the feed.

Gelatinization

Process during conditioning where particles swell, aiding in the pelleting process and improving digestibility.

Feed additives

Substances like vitamins and minerals added to pellets to balance the ration and enhance the nutritional value of the feed for livestock.

Ingredient processing

Crucial step in delivering feed ingredients to meet livestock nutritional requirements, involving various techniques to improve performance and animal health.