Abstract
From the cross between sapphire and palomino minks, the author has obtained pearl minks characterized by triple, autosomal recessive genes. The procedures in producing those pearl minks are described in this paper together with the breeding data collected for these five years (Table 1).
The crosses of sapphire×palomino resulted in the production of kits which are all dark coat-color of the original type. Based on this fact, it is shown that each kit is heterozygous for aleutian (a), platinum (p) and palomino (j). They are usually called trihybrids.
The kits produced from the trihybrid×trihybrid matings were 47 darks, 12 platinums, 8 palominos, 9 aleutians, 1 aleutian palomino and 2 pearls. This obtained ratio shows a good fit to the theoretical ratio of 27:9:9:9:3:3:3:1 regarding triple gene combination. The resulting pearl minks were crossed with those of various color types for successive four years, and gene analyses were made in kits in those experiments. In the fifth year, the author was successful in obtaining pearl minks which are characterized by triple autosomal recessive genes.
Based on the author's results of gene analysis, some possible types of mating necessary for the production of pearl kits were obtained.
