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Document Type

Thesis - University Access Only

Award Date

1995

Degree Name

Master of Science (MS)

Department

Dairy Science

First Advisor

Micheal J. Brouk

Abstract

Fifteen early lactating Holstein cows (6 multiparous and 9 primiparous) were used in a replicated 3x3 Latin square design to evaluate the effect of condensed corn distillers solubles (CCDS) in total mixe rations (TMR). Diets were control, low CCDS (5.06%), or high CCDS (10.24% of DM). All diets contained alfalfa hay, com silage, rolled corn, and a concentrate supplement formulated to make the diets isonitrogenous. Condensed corn distillers solubles were added replacing a portion of the rolled com and soybean meal from the concentrate supplement. Data were collected weeks 3 to 5 of each 5 week period, subjected to least squares analysis of variance, and differences compared using single degree of freedom orthogonal contrasts. Contrasts were control versus added CCDS, and high versus low CCDS. Dry matter intake (23.4, 24.4, and 22.5 kg/d for control, low, and high CCDS, respectively) was similar (P=.91) when contrasting added CCDS versus control, and trended to be less (P=.08) ·when comparing high to low CCDS. Milk yield (34.1, 35.5, and 35.8 kg/d) was greater (P<.01) for added CCDS versus control, and no extra benefit was found by feeding high CCDS instead of low CCDS level. Fat percent was decreased (P = .02), while protein, lactose, and SNF production was increased (P<.01) when cows were fed CCDS. Medium-chain fatty acids (FA) of milk fat were decreased (P<.01) and long-chain increased (P<.01) when feeding CCDS diets versus control, and further changes at the same magnitude of probability were found comparing high to low CCDS level. Unsaturated FAs of milk fat trended to be higher (P=.09) for CCDS diets compared to control, and were higher (P < .01) for high CCDS compared to low. Ruminal ammonia and serum urea nitrogen were lower (P=.02 and P<.01, respectively) when cows were fed CCDS versus control. This study indicates that it is advantageous to feed CCDS at 5% of DM and no extra benefit, except for changes in milk fat composition, was achieved by doubling that amount.

Library of Congress Subject Headings

Distillers feeds
Dairy cattle -- Feeding and feeds
Corn as feed
Lactation

Description

Includes bibliographical references (pages 51-57)

Format

application/pdf

Number of Pages

68

Publisher

South Dakota State University

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