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Document Type

Thesis - University Access Only

Award Date

2006

Degree Name

Master of Science (MS)

Department

Dairy Science

First Advisor

David J. Schingoethe

Keywords

Condensed Corn Distillers Solubles, Dried Distillers Grains with Solubles, Dairy Cattle

Abstract

Fifteen Holstein cows (10 multiparous and 5 primiparous) in early to midlactation (79.3 ± 9.2, DIM) were used in a replicated 5 x 5 Latin square design with 4-wk periods to evaluate and compare the use of condensed corn distillers solubles (CCDS) and dried distillers grains with solubles (DOGS) in the total mixed ration. The forage portion of the diets was kept constant at 27 .5% corn silage and 27.5% alfalfa hay (DM basis). Diets were: 1) 0% distillers grains products (control), 2) 18.5% DOGS, 3) 10% CCDS, and 4) 20% CCDS, and 5) a combination diet of 18.5% DOGS with 10% CCDS. Diets 2 and 3 contained 2% added fat from DOGS or CCDS while diet 4 contained 4% added fat from CCDS and diet 5 contained 4% added fat from the blend of DOGS and CCDS. The diets were balanced to provide 17% CP with variation in ADF, NDF, and fat concentration. Dry matter intake (21.4, 22.0, 20.9, 21.3, and 21.9 kg/d for diets 1 to 5, respectively) was similar (P > 0.10) for all diets. Milk yield (33.8, 36.2, 35.5, 36.0, and 36.0 kg/d) tended (P < 0.10) to be higher for diets 2 to 5 than for diet 1 while yields of fat (1.03, 1.02, 1.04, 1.06, and 1.04 kg/d) and protein (0.99, 1.03, 1.01, 1.03, and 1.04 kg/d), fat percentage (3.04, 2.87, 2.96, 2.96, and 2.88) and protein percentage (2.92, 2.88, 2.87, 2.88, and 2.90) were similar (P > 0.10) for all diets. Energy-corrected milk (32.2 kg/d) and feed efficiency (1.58 kg ECM/kg DMI) were similar (P > 0.10) for all diets. Milk urea nitrogen (15.0, 10.9, 11.1, 11.0, and 11.4 mg/dl) as well as blood urea nitrogen (15.6, 12.5, 14.6, 13.8, and 14.2 mg/dl) were decreased (P < 0.01; P = 0.05) in diets 2 to 5 compared with diet 1. Milk fatty acid composition showed that the concentrations of long-chain fatty acid concentrations as well as PUFA were higher (P < 0.01) and mediumchain fatty acid concentrations were lower (P < 0.01) for diets 2 to 5 compared with diet 1. The concentrations of cis-9, trans-11 CLA (0.33, 0.68, 0.51, 0.85, and 1.07 g/100 g fatty acids) as well as trans-10, cis-12 CLA (

Library of Congress Subject Headings

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

Description

Includes bibliographical references (pages 50-63)

Format

application/pdf

Number of Pages

74

Publisher

South Dakota State University

Rights

In Copyright - Non-Commercial Use Permitted
http://rightsstatements.org/vocab/InC-NC/1.0/

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