Off-campus South Dakota State University users: To download campus access theses, please use the following link to log into our proxy server with your South Dakota State University ID and password.

Non-South Dakota State University users: Please talk to your librarian about requesting this thesis through interlibrary loan.

Document Type

Thesis - University Access Only

Award Date

2005

Degree Name

Master of Science (MS)

Department

Dairy Science

First Advisor

David Schingoethe

Keywords

Distillers grains, Dairy cows

Abstract

The purpose of this study was to determine the lactation performance of dairy cows fed dried or wet distillers grains (DG) with solubles (DDGS or WDGS) at two dietary concentrations. Using 15 cows, a lactation trial was designed as a replicated 5 x 5 Latin square. Periods were 4 wk each, with samples and data collection during wk 3 and 4. Diets, on a DM basis, were: control (C), 10% DDGS, 20% DDGS, 10% WDGS, and 20% WDGS. All diets contained 25% com silage, 25% hay, and 50% of the respective concentrate mixes. Diets were balanced, using com and soybean meal, for 1 7% crude protein. Dry matter intake (DMI) tended (P < 0.1) to be greater for cows fed C than DG (23.4, 22.8, 22.5, 23.0, 21.9 kg/d for C, 10% DDGS, 20% DDGS, 10% WDGS, 20% WDGS). Milk yield (39.8, 40.9, 42.5, 42.5, 43.5 kg/d) was greater (P < 0.05) for cows fed DG than C. Milk fat percentage (3.23, 3.16, 3.28, 3.55, 3.40) was similar for cows fed C and DG, but greater (P < 0.05) for cows fed WDGS than DDGS. Milk fat yield (1.28, 1.32, 1.39, 1.44, 1.43 kg/d) was greater (P < 0.05) for cows fed DG than C, and tended (P < 0.1) to be greater for cows fed WDGS than DOGS. Milk protein percentage (3.05, 3.01, 3.02, 3.11, and 3.06) was similar for cows fed C and DG, but greater (P3) concentrations (4.81, 3.75, 3.10, 3.91, 5.04 mg/dL) were greater (P < 0.05) for cows fed WDGS than DDGS. Overall, feeding DG improved performance by decreasing DMI, and increasing yields of milk, protein, and fat. This led to greater (P < 0.05) feed efficiency, as determined by energy-corrected milk (ECM) divided by DMI, in the DG fed cows compare to C fed cows (1.70, 1.79, 1.87, 1.84, 1.92). Responses were similar for 10% or 20% DG; however, feeding WDGS instead of DDGS increased milk fat and protein percentages. A supplemental in situ study showed that SBM had a greater (P

Library of Congress Subject Headings

Dairy cattle -- Feeding and feeds
Distillers feeds
Lactation

Description

Includes bibliographical references (pages 52-58)

Format

application/pdf

Number of Pages

70

Publisher

South Dakota State University

Rights

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

Share

COinS