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Document Type

Thesis - University Access Only

Award Date

2015

Degree Name

Master of Science (MS)

Department

Dairy Science

First Advisor

David Casper

Abstract

The objective of the first experiment was to determine if feeding the rumen degradable amino acid (AA), valine (Val), can increase milk production comparable to recombinant bovine somatotropin (bST). Eight multiparous late-lactating Holstein dairy cows were blocked by milk yield and randomly assigned to 1 of 4 treatments in a replicated 4 × 4 Latin square design. Treatments were control (CON), single injection of recombinant bST (rbST), and Val fed at 40 (V40) and 80 g/d (V80). Cows were fed a total mixed ration (TMR) with a distillers dried grains carrier at 113.4 g/d containing none or added AA. Dry matter intake (DMI) (21.3, 22.0, 22.8, and 21.5 kg/d for CON, rbST, V40, and V80, respectively) was similar among treatments, except cows receiving V40 had greater DMI than cows receiving V80. Milk yield (22.0, 26.1, 25.2, and 24.9 kg/d), 3.5% fat-corrected milk (FCM) (22.1, 25.4, 24.4, and 24.3 kg/d), and energycorrected milk (ECM) (22.7, 26.1, 25.1, and 24.9 kg/d) were increased at similar amounts for cows receiving rbST, V40, and V80 compared to cows receiving CON. This study suggests that feeding rumen degradable Val can increase milk yield comparable to recombinant bST. The second experiment evaluated the palatability of a new product that involves a coating process to encapsulate potassium carbonate with free fatty acids to eliminate xiii concerns about potassium carbonate heating and caking. Ten lactating Holstein dairy cows were randomly assigned to 1 of 2 treatments for 5 d. Treatments were control consisting of DCAD Plus (Church and Dwight Company, Inc., Ewing, NJ) fed at 68 g/d with 204 g/d of Energy Booster 100 (Milk Specialties Global, Eden Prairie, MN) (CON) and free fatty acid encapsulated potassium carbonate (Milk Specialties Global, Eden Prairie, MN) fed at 272 g/d (EB-K). Cows were fed a TMR 1×/d. No differences were found in DMI between cows receiving CON compared to cows receiving EB-K for either 10 min after feeding or ad libitum intake. This study suggests that there is no palatability issue with the new product when fed to lactating Holstein dairy cows.

Library of Congress Subject Headings

Dairy cattle -- Feeding and feeds
Amino acids in animal nutrition
Milk yield
Valine
Lactation

Description

Includes bibliographical references (pages 82-96)

Format

application/pdf

Number of Pages

109

Publisher

South Dakota State University

Rights

In Copyright - Educational Use Permitted
http://rightsstatements.org/vocab/InC-EDU/1.0/

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