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 Keywords
- Dairy farming
Date of Defense 1985-09-05 Availability restricted AbstractA 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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