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It has previously been shown that miniature poodles with regressive rod-cone degeneration (PRCD) have lower plasma levels of docosahexaenoic acid (22:6n-3) than normal poodles and it has been suggested that affected animals have a defect in the motabolism of 22:6n-3. To test this hypothesis in vivo, PRCD affected and normal miniature poodles were given daily oral supplements of linsee oil (enriched in 19:3n-3, 20:5n-3, and 22:5n-3 between affected and normal dogs. Therefore, there appears to be no abnormality in the elongation and desaturation system that takes 18:3n-3 and 22:5n-3. Surprisingly, the plasma level of 22:6n-3 was reduced in both groups …

Segregation distortion was observed in inheritance of progressive rod–cone degeneration (prcd) in a colony of Miniature Poodle dogs. Breeding results, from both retrospective records and prospectively planned matings, were classified into five mating types: (1) affected to affected, (2) homozygous normal sire to any dam, (3) heterozygous to heterozygous, (4) heterozygous sire to affected dam, and (5) affected sire to heterozygous dam. For all but the last category, results were in accord with mendelian expectations for autosomal-recessive inheritance. However, litters of mating type 5 had fewer affected pups (20/77) than expected. The observed segregation ratio for this mating type (0.26) …