Evaluation of Current Dairy Heifer Growth Models

Honors College Thesis

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Citeable URL: https://ir.library.oregonstate.edu/concern/honors_college_theses/47429c23f

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Attribute Name	Values
Creator	Zaworski, Erica M.
Abstract	Growth models developed by Pennsylvania State University (Penn State) extension services for Holstein and Jersey heifer height and weight were evaluated using OSU dairy herd heifer data. The purpose of this study was to determine the ability of the models to predict heights and weights of heifers in the OSU herd based on age. Regression lines of the models for one standard deviation above the mean and the data were compared. Residual values and biases of the models’ predictions were evaluated. Mean biases were -14.96, -33.9, -5.4, and -.9.34 for Holstein weight, Jersey weight, Holstein height, and Jersey height, respectively. Linear biases were -0.1, -0.12, -0.08, and -0.07 for Holstein weight, Jersey weight, Holstein height, and Jersey height, respectively. The Penn State models did not accurately predict observed values from the OSU herd, indicating a need for further study of the models using a larger population.
License	All rights reserved
Resource Type	Honors College Thesis
Date Available	2008-06-19T16:15:36+00:00
Date Issued	2008-05-15
Degree Level	Bachelor's
Degree Name	Honors Bachelor of Science (H.B.S.)
Degree Field	Animal Science
Degree Grantor	Oregon State University
Commencement Year	2008
Advisor	Davidson, Jill
Non-Academic Affiliation	Oregon State University. Honors College
Dichiarazione dei diritti	In Copyright
Publisher	Oregon State University
Peer Reviewed	No
Language	English [eng]
Replaces	http://hdl.handle.net/1957/8818

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