Maximum Likelihood Estimation of Genetic Parameters in Life-History Studies Using the `Animal Model'

1995 ◽  
Vol 9 (1) ◽  
pp. 122 ◽  
Author(s):  
S. A. Knott ◽  
R. M. Sibly ◽  
R. H. Smith ◽  
H. Moller
Keyword(s):  
Animal Model ◽  
Life History ◽  
Maximum Likelihood ◽  
Maximum Likelihood Estimation ◽  
Genetic Parameters ◽  
Likelihood Estimation ◽  
Estimation Of Genetic Parameters

MAXIMUM LIKELIHOOD ESTIMATION OF GENETIC PARAMETERS IN CANADIENNE, BROWN SWISS, AND MILKING SHORTHORN

1978 ◽  
Vol 58 (2) ◽  
pp. 271-276 ◽  
Author(s):  
W. D. SZKOTNICKI ◽  
A. K. W. TONG ◽  
K. M. KROTCH ◽  
M. A. SHARABY ◽  
L. P. JOHNSON ◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Maximum Likelihood Estimation ◽  
Variance Components ◽  
Genetic Parameters ◽  
Mixed Model ◽  
Likelihood Estimation ◽  
Brown Swiss ◽  
Fat Yield ◽  
Estimation Of Variance ◽  
Estimation Of Genetic Parameters

The application of maximum likelihood estimation of variance components to all lactation milk and fat records of three dairy breeds was accomplished with relative computational ease. Discussion of some of the practical problems of maximum likelihood estimation for the mixed model with sires and cows nested within sire is presented. Further study of a few of these problems is warranted. The estimated heritabilities for milk and fat yields were.27 for all three breeds, and repeatabilities were.50, except for Milking Shorthorn where repeatability estimates were.53 and.52 for milk and fat yield, respectively.

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