Markup | Genome Research

Table 1.

Effect of the DGAT1 K232A Mutation on Sires' Daughter Yield Deviations (DYDs) for Milk Yield and Composition

Trait	α/2 ± 2std.err.	r $_{QTL}^{2}$	Pvalue_QTL	r $_{polygenic}^{2}$	r $_{error}^{2}$
Milk yield (kgs)	−158 ± 24.5	0.18	5.00E − 35	0.49	0.32
Fat yield (kgs)	5.23 ± 0.9	0.15	1.57E − 29	0.55	0.30
Protein yield (kgs)	−2.82 ± 0.7	0.08	1.70E − 15	0.65	0.26
Fat (%)	0.17 ± 0.012	0.51	4.33E − 122	0.29	0.19
Protein (%)	0.04 ± 0.006	0.14	5.05E − 28	0.66	0.20

[i] (i) α/2: QTL allele substitution effect on DYD (≈ halve breeding value), corresponding in the mixed model to the regression coefficient on the number of K alleles in the DGAT1 K232A genotype, and to α/2, where α is defined according to Falconer and Mackay 1996. (ii)r $_{QTL}^{2}$ : proportion of the trait variance explained by the DGAT1 K232Apolymorphism. (iii) P value_QTL: statistical significance of the DGAT1 K232A effect. (iv)r $_{polygenic}^{2}$ : proportion of the trait variance explained by the random, polygenic effect in the mixed model. (v)r $_{error}^{2}$ : proportion of the trait variance unexplained by the model.