Author

Anne M. Finn

Document Type

Thesis - Open Access

Award Date

1983

Degree Name

Master of Science (MS)

Department

Dairy Science

First Advisor

David J. Schingoethe

Abstract

Thirty Holstein cows were utilized in a lactation trial evaluating diets containing whole-rolled sunflower seeds. Cows were randomly assigned to treatments, grouped according to previous milk production and lactation number. The cows were fed one of three diets: 1) the control was a com-soybean meal mix (CSM), 2) com-soybean meal mix plus 22% whole-rolled sunflower seeds, and 3) a corn-soybean meal mix with 22% whole-rolled sunflower seeds with an additional 3.5% limestone over SCS (SCL). Additional limestone was added in an attempt to form fatty acid insoluble soaps. Rations were formulated to be isonitrogenous at 16% crude protein, fed as a complete mixed ration, and were fed ad libitum. Diets were formulated to contain 45% corn silage, 10% alfalfa hay, and 45% of the respective concentrate mix. Cows were fed the rations from 21 days postpartum and continued for 120 days. Milk production (32.2, 32.0, and 32.8 kg/day for CSM, SCS, and SCL, respectively) was similar for all three diets. However, 4% fat-corrected milk (30.2, 28.1, and 30.2 kg/day) was lower when fed SCS because of lower milk fat percentages (3.57, 3.19, and 3.51%). Milk protein (3.01, 2.97, and 2.90%) and total solids (11.99, 11.65, and 11.87%) were similar when fed all three diets. Dry matter intakes were 21.0, 18.4, and 20.0 kg/day for CSM, SCS, and SCL, respectively. No differences were observed in volatile fatty acids (molar %, concentration) and pH among the three treatments. Serum cholesterol values were higher for treatments containing 22% whole-rolled sunflower seeds, 166.0, 223.0, and 255.0 mg/dl for the respective diets.

Library of Congress Subject Headings

Dairy cattle -- Feeding and feeds
Limestone
Holstein-Friesian cattle
Sunflower -- Seeds

Description

Includes bibliographical references (pages 42-49)

Format

application/pdf

Number of Pages

66

Publisher

South Dakota State University

Included in

Dairy Science Commons

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