Page 11 - Swaledale Flock Book

IX
EXPLANATION OF GENOTYPE GROUPING AS USED BY
THE SWALEDALE SHEEPBREEDERS’ ASSOCIATION
Genotype 136 154 171 Combination of
Group Result Result Result Gene Strands
(alleles)
A A/A R/R R/R ARR/ARR
B1 A/A R/H R/Q ARR/AHQ
B2 A/A R/R R/Q ARR/ARQ
B3 A/V R/R R/Q ARR/VRQ
C1 A/A H/H Q/Q AHQ/AHQ
C2 A/A H/R Q/Q AHQ/ARQ
C3 A/A R/R Q/Q ARQ/ARQ
C4 A/V H/R Q/Q AHQ/VRQ
D1 A/V R/R Q/Q ARQ/VRO
D2 V/V R/R Q/Q VRQ/VRQ
A= Alanine V = Valine R = Arginine
H = Histidine Q = Glutamine
Class A results indicate a high level of resistance in the animal tested
and a high level of protection in progeny. Sheep with class B and C
results also generally have a high level or resistance in the Swaledale
breed but progeny of class C animals may be less protected than
progeny of class B sheep.
Shearling Rams with B3, C4 or D Genotypes are no longer for
breeding under this scheme.