Skip to main content

Table 4 Comparison of the goodness of fit of models A and A + D based on conservative maximum likelihood (ML) ratio test for calving interval (CI), milk, fat and protein yields in Holstein and Jersey cows

From: Accounting for dominance to improve genomic evaluations of dairy cows for fertility and milk production traits

Breed Parameter Model Trait
CI Milk yield Fat yield Protein yield
Holstein Log of ML A −112,604 −154,634 −85,995 −80,469
A + D −112,603 −154,629 −85,990 −80,465
P value*   0.0569 0.00095 0.00095 0.0026
Jersey Log of ML A −52,292 −69,655 −39,350 −35,684
A + D −52,292 −69,650 −39,343 −35,676
P value*   0.0012 5.91E-05 3.23E-05
  1. Model A = taking only additive effects into account
  2. Model A + D = taking both additive and dominance effects into account
  3. P values of the Chi square tests calculated as χ 2 = −2(log MLA − log MLA + D) with 1 degree of freedom from a mixture of Chi squared distributions with 1 and 0 degree freedom