Title page for ETD etd-11152013-040343

Type of Document Master's Thesis
Author Schucker, Brenda Lee
URN etd-11152013-040343
Title A field study of a computerized method of grouping dairy cattle
Degree Master of Science
Department Dairy Science
Advisory Committee
Advisor Name Title
Michael L. McGilliard Committee Chair
C. C. Stallings Committee Member
J. M. White Committee Member
K. L. Lee Committee Member
R. E. James Committee Member
  • Dairy farming
Date of Defense 1985-09-05
Availability restricted
A computer modeling experiment showed that grouping dairy cattle based on requirements of crude protein and net energy per kilogram expected dry matter intake (Grouper) had unique characteristics relative to other grouping systems. The objective of this study was to adapt the computerized Grouper system for practical use by implementing a field trial in commercial dairy herds to determine its managerial benefits and economic merit. Ten cooperating dairy herds participated in the one year trial. Herds were grouped monthly using test day information obtained from the Dairy Records Processing Center, Raleigh, NC and reports mailed to the

cooperators. Feed consumption data and a record of cows not placed according Grouper recommendations were collected during monthly herd

visits or by mail. One set of analyses examined trends in Dairy Herd Improvement (DHI) variables through trial duration while another set

compared Grouper to a comparable milk production grouping program with all herd test day information grouped with both systems.

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