Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School

Animal Science


It is now an established practice to feed continuously certain feed additives in the rations of simple stomach animals for the control of disease, digestive troubles, bloat, internal parasites and for their growth stimulating properties. It is very important that additives of an antibacterial nature in rations for ruminants be studied thoroughly so their beneficial effects, if any, can be determined. If the bacteria are not functioning normally and digesting properly, the animal will suffer. Digestion of the ration would also be affected, and the efficiency of feed conversion would diminish. Supplements to the ruminant ration in the form of dried rumen products are now being used. These products are manufactured by drying the rumen contents of healthy, slaughter animals. Attempts have been made to justify the inclusion of dried rumen products in the ration of ruminants on the basis that they contain a high concentration of live bacteria; thus inuring a more normal rumen flora and better digestion of the ration. The value of adding these rumen inoculums to the ration has not been well established. The work reported herein was designed to further study the effects of an antibiotic, chemobiotic and dried rumen product on digestion, in vivo and in vitro, rate of gain and feed efficiency by sheep. Rations used were a high-concentrate ration and a low-concentrate ration so a precise picture could be obtained as to their effect.

Library of Congress Subject Headings

Sheep -- Feeding and feeds


Includes bibliographical references



Number of Pages



South Dakota State University