Impact of two myostatin ( MSTN ) mutations on weight gain and lamb carcass classification in Norwegian White Sheep ( Ovis aries )

Table 4 Solutions ± standard errors for various traits and allelic effects

Allelic effect	a2360	d2360	a960	d960	int.
Weight gain/d from birth to weaning (g)	-3 ± 4	-2 ± 5		27^0.001 ± 8	-7 ± 9
Weaning weight (kg)	-0.6 ± 0.5	-0.2 ± 0.6		2.8^0.004 ± 1.0	-0.5 ± 1.2
Carcass weight gain/d from birth to slaughter (g)	1 ± 2	-2 ± 3	3 ± 3	4 ± 4	-1 ± 5
Carcass weight (kg)	0.2 ± 0.2	-0.3 ± 0.3		-0.2 ± 0.4	0.3 ± 0.5
Carcass conformation class (scale 1-15)	0.3^0.015 ± 0.1	-0.1 ± 0.2		-1.7^0.000 ± 0.3	0.8^0.014 ± 0.3
Carcass fat class (scale 1-15)	-0.4^0.000 ± 0.1	-0.2 ± 0.1		0.5^0.010 ± 0.2	0.0 ± 0.3

Additive (a) and dominance (d) effect for mutations in position c.2360 and c.960 respectively, and the interaction effect (int), when both mutations are present. The P-value of genotype classes contrasted with the wild type (GG_GG) is presented as superscript, while the P-value for G(delG)_GG, G(delG)_AG and (delG)(delG)_GG contrasted with GG_AA is given in subscript. The P-values are given only for significant findings (P < 0.05).