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Document Type

Thesis - University Access Only

Award Date

1990

Degree Name

Master of Science (MS)

Department / School

Animal Science

First Advisor

George W. Libal

Abstract

The main objective of these experiments was to examine a [sic] various factors that could affect vitamin E status in the weaned pig. Three levels of vitamin A (3300, 9900, and 16500 IU/kg of feed) and two levels of vitamin E (16.5 and 33 IU/kg of feed) were supplemented to the basal diet in Exp. I. to observe their effects on weanling pig (n=96) performance, plasma retinol and plasma a-tocopherol (P-α-1) concentrations on d 28 postweaning. Pigs fed the diets supplemented with 9900 IU vitamin A/kg of feed had reduced weight gains and converted feed less efficiently than pigs fed 3300 IU vitamin A/kg of feed (P < .05). A significant treatment interaction was observed between vitamin A and vitamin E supplementation. P-α-T concentrations were depressed in pigs fed the diet contained 33 IU vitamin E and 9900 IU vitamin A (P < .05). In Exp. II., ninety six crossbred weanling pigs between 21 and 30 days of age were stratified to a 2 x 2 x 2 factorial arrangement of dietary levels of vitamin A (3300 and 16500 IU/kg), vitamin E (16.5 and 33 lU/kg) and fat (0 and 5%) to determine their effects on plasma retinal, a-tocopherol and total lipid concentrations in the weanling pig. The addition of 33 IU vitamin E/kg of feed increased P-α-T concentrations on a µg/ml or µg/mg of lipid basis (P < .01). The objective of the third and fourth experiments was to compare plasma α-tocopherol concentrations to liver a-tocopherol concentrations with regard to absorption of . vitamin E by the weaned pig. Plasma and liver α-tocopherol concentrations were correlated (R2 = . 70) but the vitamin E injectable proved to be unavailable to the weaned pig. In the last experiment, different chemical forms of vitamin E were supplemented to weaned pigs to determine whether synthetic sources contribute to the postweaning drop in plasma α-tocopherol concentration. Plasma α-tocopherol concentrations were unaffected by source of vitamin E used in dietary supplementation when supplemented on unit of activity basis.

Library of Congress Subject Headings

Swine -- Feeding and feeds
Vitamin E in animal nutrition

Format

application/pdf

Number of Pages

56

Publisher

South Dakota State University

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