JDS
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Journal of Dairy Science Vol. 75 No. 7 2008-2016
© 1992 by American Dairy Science Association ®
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Harris, B. L.
Right arrow Articles by Metzger, E.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Harris, B. L.
Right arrow Articles by Metzger, E.

Analysis of Herd Life in Guernsey Dairy Cattle

B. L. Harris 1, A. E. Freeman 1, and E. Metzger 2

1 Animal Science Department, Iowa State University, Ames 50011
2 American Guernsey Association, Reynoldsburg, OH 43068

Heritabilities and genetic and phenotypic correlations for 48- and 72-mo herd life were estimated with multiple-trait REML from sire models incorporating sire relationships. Two traits were defined for 48- and 72-mo herd life, true herd life and functional herd life, which were adjusted for milk production prior to culling. Heritabilities for 48- and 72-mo herd-life traits were low, ranging from .02 to .07; genetic correlations among herd-life traits ranged from .82 to .95, and phenotypic correlations ranged from .80 to .97. Genetic correlations between the herd-life traits and first lactation milk, fat, and protein production ranged from .37 to .81. Genetic correlations were lower between functional herd life and milk, fat, and protein production than among true herd life and these same variables. Multiple-trait REML from sire models, which included sire relationships, was used to estimate genetic and phenotypic correlations between 48-mo true or 48-mo functional herd life and linear type traits for registered Guernsey cattle. The genetic correlations were used to compute weights for indirect prediction of true and functional herd-life transmitting abilities from linear type traits transmitting abilities. The predictions are equivalent to multiple-trait BLUP with no observations for herd life.

Key Words: Guernsey • herd life • genetics • linear type traits

Submitted on January 13, 1992
Accepted on March 20, 1992




This article has been cited by other articles:


Home page
 J DAIRY SCIHome page
M. J. Haskell, S. Brotherstone, A. B. Lawrence, and I. M. S. White
Characterization of the Dairy Farm Environment in Great Britain and the Effect of the Farm Environment on Cow Life Span
J Dairy Sci, November 1, 2007; 90(11): 5316 - 5323.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
M. A. Perez-Cabal and R. Alenda
Lifetime Profit as an Individual Trait and Prediction of its Breeding Values in Spanish Holstein Cows
J Dairy Sci, December 1, 2003; 86(12): 4115 - 4122.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1992 by the American Dairy Science Association ®.