Document Type

Thesis - Open Access

Award Date

1973

Degree Name

Master of Science (MS)

Department

Dairy Science

Abstract

The trend in dairying in recent years has been towards more confinement housing and higher producing animals. Such confinement housing often leads to year-around feeding of stored feeds, such as silage, haylage, and hay with no pasture grazing or feeding of freshly cut forages. Since stored feeds contain substantially less vitamin E than those same forage when freshly cut or grazed, it may be important to re-evaluate the vitamin E status of cows fed stored feeds continuously. The requirement of cattle for vitamin E are largely unknown. The one study involving adult cattle, conducted 25 years ago, found that 1.82 mg alpha-tocopherol/kg cow prevented the only abnormal sign, cardiac failure (29, 30). However, the vitamin E content of a stores feed diet may range from 400 mg/day to 1300 mg/day for a 500 kg animal (1). Thus it is possible that cattle fed only stored feeds for several years may become deficient in vitamin E. The purposes of this research were to determine if a vitamin E deficiency could be cause by continued feeding of stored feeds and to characterize such a deficiency if it should occur.

Library of Congress Subject Headings

Vitamins
Dairy cattle -- Feeding and feeds

Description

Includes bibliographical references (pages 21-25)

Format

application/pdf

Number of Pages

37

Publisher

South Dakota State University

Included in

Dairy Science Commons

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