Comparative analyses of genetic trends and prospects for selection against hip and elbow dysplasia in 15 UK dog breeds

Table 2 Estimates of genetic progress and selection pressure for hip and elbow score

Hips	Progress / σ_A	*b (x10* ^-2 )	i	p excluded
AKT	−0.28	−0.66	−0.08	<0.04
BEARD	−0.12	−0.16	−0.04	<0.02
BORD	−0.36	−0.63	−0.13	<0.07
ENG	−0.67	−1.07	−0.24	<0.13
FCR	−0.17	−0.13	−0.04	<0.02
GDN	−0.82	−1.95	−0.32	<0.18
NEWF	−0.82	−2.00	−0.22	<0.12
RR	−0.19	−0.32	−0.06	<0.02
SHUSK	0.25	0.81	0.12	N/A
TT	−0.36	−0.52	−0.13	<0.06
BMD	−0.30	−0.68	−0.12	<0.06
GR	−0.71	−1.20	−0.23	<0.13
GSD	−0.48	−0.89	−0.16	<0.08
LAB	−0.77	−1.28	−0.28	<0.16
ROTT	−0.59	−0.78	−0.14	<0.07
Elbows
BMD	−0.20	−0.72	−0.11	<0.06
GR	−0.13	−0.31	−0.09	<0.04
GSD	−0.14	−0.21	−0.14	<0.07
LAB	−0.13	−0.18	−0.12	<0.06
ROTT	−0.21	−0.39	−0.15	<0.08

Genetic progress was estimated in two ways: total change as mean EBV₂₀₁₁-mean EBV₁₉₉₀ (for hips, EBV₂₀₁₁-mean EBV₂₀₀₀ for elbows) as proportion of genetic standard deviation (σ_A) and annually by the regression coefficient (b) of EBV on date of birth. Selection pressure was described in two ways: standardised selection intensity (i) against hip/elbow score, and the equivalent proportion of breeding individuals excluded required to achieve that intensity by truncation of the distribution. The top panel shows parameters for 10 breeds derived from univariate analyses of hip score and the middle panel shows hip parameters for 5 breeds derived from bivariate analyses of hip and elbow score. The bottom panel shows elbow parameters for 5 breeds derived from bivariate analyses of hip and elbow score. Breed abbreviations: Akita [AKT], Bearded Collie [BEARD], Bernese Mountain Dog [BMD], Border Collie [BORD], English Setter [ENG], Flat Coat Retriever [FCR], Gordon Setter [GDN], Golden Retriever [GR], German Shepherd Dog [GSD], Labrador Retriever [LAB], Newfoundland [NEWF], Rottweiler [ROTT], Rhodesian Ridgeback [RR], Siberian Husky [SHUSK] and Tibetan Terrier [TT].

ISSN: 2730-6844