Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)


Animal Science


Increasing feed costs in recent years have led researcher and producers to look to different sources for their feedstuffs. Many by-products of various industries have been studied to determine their potential as livestock feeds. One product that has been used to spare feed grains in the diet by increasing the total dietary energy and increasing feed efficiency. The amino acid lysine represents another opportunity to decrease food costs of swine diets when protein supplementation is costly. Lysine is the first limiting amino acid in most practical swine diets. The addition of lysine has proven effective in diets adequate in other nutrients but deficient in lysine. The purpose of the research conducted and summarized here was to study the effect of different levels of fat and lysine in diets adequate in other nutrients. Most studies indicate that increasing energy causes a decrease in feed consumption which increases the need for additional protein to meet total protein requirements. This study was designed to determine if a similar relationship exists for lysine and energy. Rate of grain, feed consumption, feed efficiency and blood urea nitrogen levels were the criteria evaluated for growing and finishing swine.

Library of Congress Subject Headings

Swine -- Feeding and feeds

Lysine in animal nutrition



Number of Pages



South Dakota State University