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Document Type

Thesis - University Access Only

Award Date

1997

Degree Name

Master of Science (MS)

Department

Dairy Science

First Advisor

David J. Schingoethe

Abstract

Two nutritional strategies to increase energy intake during early lactation were evaluated utilizing 71 Holstein dairy cows (34 primiparous and 3 7 multiparous) in a total lactation trial. Cows were randomly assigned at parturition to 1 of 3 dietary treatment regimes: Control (CON = 50:50 forage: concentrate (F: C) first 100 d); increased caloric density from fermentable carbohydrates (CHO = 45 :55 first 100 d); or increased caloric density from fat (FAT = 50:50 first 100 d). After 100 d postpartum, all cows continued on the CON diet with F: C increasing to 60:40 after production declined to < 32 kg/d ( < 25.0 kg/d for lactation 1), and to 70:30 for ≥2 lactation cows producing < 20. 5 kg/ d. During the first 140 d postpartum, milk production tended to be greater (P< 0.06) for all cows fed the FAT diet with multiparous cows having 9 to 10% greater production (34.0, 33.7, and 37.0 kg/d for cows fed CON, CHO, and FAT diets, respectively), and 7% greater for primiparous cows (27.8, 26.8, and 28.7 kg/d). Total lactational milk yield was similar for all dietary treatment regimes. Milk fat percentages (3.78, 3.94, and 4.11 %) and milk protein percentages (3. 34, 3 .43, and 3 .43 % ) were similar for all treatments. Average days open and services per conception were similar for all treatments. Number of incidences of health problems were similar for all treatments. Feeding supplemental fat during early lactation increased production, especially by multiparous lactation cows, and was cost effective. Feeding a higher fermentable carbohydrate diet (CHO) during early lactation did not increase production and was not cost effective.

Library of Congress Subject Headings

Dairy cattle -- Feeding and feeds
Energy metabolism
Milk yield

Description

Includes bibliographical references (pages 47-53)

Format

application/pdf

Number of Pages

63

Publisher

South Dakota State University

Rights

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

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