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Journal of Dairy Science Vol. 71 No. 1 232-238
© 1988 by American Dairy Science Association ®
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Relationships among Type Scores and Changes in Yield from First to Second Lactation1

G. W. Rogers and B. T. McDaniel

Department of Animal Science, North Carolina State University, Raleigh 27695-7621

ABSTRACT

Changes between first and second lactation yields of days open adjusted milk and 3.7% FCM were correlated with classification traits. Yields within first and second lactation were corrected for herd-season, calving month within season, and age at calving. Classification scores during first lactation were available on 1341 cows appraised between 1971 and 1982 by Holstein Association of America classifiers in five North Carolina Department of Agriculture herds and a North Carolina State University research herd. All classification traits except final score were categorical. Final score, general appearance, dairy character, body capacity, mammary system, stature, rear udder, fore udder, and feet and legs were treated as continuous. Classification traits were adjusted for herd-year, age, and months in milk. First lactation milk was added as a covariate in selected analyses. Body capacity, dairy character, mammary system, back, rump, rear udder, and udder support each had significant effects on change in yield. Mammary system and final score showed a significant linear relationship with change in yield for at least one model. Dairy character and fore udder significantly predicted change in 3.7% FCM when first lactation milk was not in the model.

FOOTNOTES

1 Paper Number 11,000 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh 27695-7601.






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Copyright © 1988 by the American Dairy Science Association ®.