Evaluation of Current Dairy Heifer Growth Models Public

http://ir.library.oregonstate.edu/concern/honors_college_theses/47429c23f

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  • 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.
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  • description.provenance : Submitted by Heather Boren (borenh) on 2008-06-18T23:04:58Z No. of bitstreams: 1 Thesis Zaworski.pdf: 279934 bytes, checksum: b9c4245b86c3238340d032db4f757138 (MD5)
  • description.provenance : Made available in DSpace on 2008-06-19T16:15:36Z (GMT). No. of bitstreams: 1 Thesis Zaworski.pdf: 279934 bytes, checksum: b9c4245b86c3238340d032db4f757138 (MD5)

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