Animal Science Terms - L

Lactase: enzyme that is found in the small intestine, liver and kidneys of mammals. This enzyme begins the process of breaking down the protein lactose, found in dairy products

Lactose: disaccharide sugar made up of galactose and glucose found only in milk, but only makes up a small percentage of the milk fluid

Lactation: period of time after parturition in which an adult female mammal produces milk; the secretion or formation of milk in the mammary glands of mammals

Lagoon: manure storage basin (pond) dug into the ground and earthen lined to prevent absorption into the soil. Solids settle to the bottom and bacteria and microorganisms break down the manure, resulting in a nutrient-rich “wastewater” with less odor that can serve as a natural fertilizer when spread on fields

Lamb: 1. young sheep, less than one year old. 2. referring to meat from a sheep that is 12-14 months old or less

Lambkin (Lambling): newly born lamb

Land-Grant Universities: state colleges and universities started from federal government grants of land to each state to encourage further practical education in agriculture, home economics and the mechanical arts

Lard: types of pig were developed to have large deposits of fat that could be more easily butchered from the animal in large chunks. This makes rendering easier and results in less loss of good meat

Larvae: immature stage of an adult parasite. The term applies to insects, ticks and worms

Legumes: family of plants that has nodules on the roots to enable them to fix nitrogen from the atmosphere. Legumes are high in protein and bear their seeds in a pod (i.e., clover, alfalfa, cowpea)

Lethargy: animal that is slow to react lacks energy and is often sick

Lethal Gene (Deadly): gene or genes that cause death of an individual which are possessed by them during pregnancy or at the time of birth

Libido: sex drive

Lignin: complex polymer bound to cellulose that strengthens plant cell walls but is indigestible to animals

Line Breeding: form of inbreeding that attempts to concentrate the genetic makeup of some ancestor

Lipids: any of a large group or organic compounds found in plant and animal tissues that are oily to the touch and insoluble in water. Lipids include glycolipids, phosphoglycerides, fatty acids, oils, waxes, steroids, and triglycerides. They are a source of stored energy and are a component of cell membranes

Liquid feed: feed with a high water content, (e.g., 2:1 water:feed)

Liquid protein supplement (LPS): protein product usually containing molasses, urea, added vitamins and trace minerals. It is particularly useful in pasture feeding

Litter: 1. material used as bedding for animals. 2. Material used to absorb the urine and feces of animals. 3. The uppermost slightly decayed layer of organic matter on the forest floor. 4. The offspring at one birth of a multiparous mammal, also called brood. Example: A litter of puppies

Liver: 1. large glandular organ in the abdomen of vertebrate animals that is essential to many metabolic processes. The liver secretes bile, stores fat and sugar as reserve energy sources, converts harmful substances to less toxic forms, and regulates the amount of blood in the body. 2. A similar organ in invertebrate animals

Liver Flukes: small leaf-shaped organism that rolls up like a scroll in the bile ducts or liver tissue

Livestock: domestic farm animals kept for productive purposes (meat, milk, work, wool)

Llamas: domesticated camelid species, widely used as a meat and pack animal but also known for their wool

Loin: muscle that lies between the last rib and the hip bones of the back. Is commonly used to describe the part of the body between the last rib and the hip

Lope: western term for a slower from of the canter

Lungworms: roundworms found in the respiratory tract and lung tissue

Lutalyse (Prostaglandin): hormone used for synchronizing estrus

Lysine: essential amino acid for protein synthesis. It is the first limiting amino acid in corn-soybean-based swine diets. Can be added in a synthetic form to diets



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