Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School

Animal Science


A large number of Midwest farmers depend upon the swine enterprise for a part of their annual income. Swine sales constitute a large per cent of the cash farm income in this geographical area and therefore these animals represent a very important phase of livestock production. Approximately 18 per cent of the total cash farm income in South Dakota is obtained from the production of hogs. A successful swine producer is primarily interested in obtaining the greatest return for his financial investment and labor output. In order to attain these goals it is often desirable to feed a highly fortified and balanced ration. In the production of swine feed efficiency, rate of gain and the quality of pork produced are factors that should be taken into consideration. Including certain feed additives to the ration during the finishing phase of the growing period in swine may not necessarily produce a higher feed efficiency or a more desirable carcass. An evaluation of the various feed additives should be made relative to their need during the different stages of growth. The work reported herein is a part of a project conducted by the swine division of the Animal Husbandry Department at South Dakota State College in an effort to determine the value of erthroanycin, a new antibiotic to the swine nutrition field. The objectives of the study were to determine the value of erythromycin at different levels in the ration during the growing-finishing period. The measures used for evaluation were rate of gain, feed efficiency, and carcass quality.

Library of Congress Subject Headings

Swine -- Feeding and feeds


Includes bibliographical references



Number of Pages



South Dakota State College of Agriculture and Mechanic Arts


No Copyright - Non-Commercial Use Only