The Vitamin E Status of Lactating Dairy Cows after Receiving Stored Feeds for 15 Months

<p>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.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis - Open Access

Discipline thesis:degree_discipline

Dairy Science

Year dc:date.available

1973

Author dc:creator

• Eckhart, Marc Dellhime

• Dairy Science

Statement dc:rights

• <p>In Copyright - Non-Commercial Use Permitted<br /><a href="http://rightsstatements.org/vocab/InC-NC/1.0/">http://rightsstatements.org/vocab/InC-NC/1.0/</a></p>

Language dc:language

en

Repository record dc:identifier

https://openprairie.sdstate.edu/etd/1278

OAI identifier oai:identifier

oai:openprairie.sdstate.edu:etd-2279