On the D system in the Light Breed Horses of Japan

概要

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The present studies were carried out to analyze according to the allocation method the phenogroups of the D system in the light breed horses ( Thoroughbreds and Anglo-Arabs ) of Japan. The results are as follows: 1. The D system in the light breed horses consisted of six alleles of Dbc, Dcg, Dg, Dfl, Dl and D-, and their gene frequencies were 0.169, 0.429, 0.020, 0.030, 0.350 and 0.002, respectively. 2. As the result of studies on the D system of about 35, 000 horses, the D-/D-type was not observed at all. And also, taking thought for the segregation data of the Dl factor in the offsprings obtained from matings between the Dl factor positive and negative individuals, it could be surmised that the D system is closed through the Dl factor. However, a few exceptions to that rule were encountered. 3. To analyze the phenogroups was not difficult because the D system consisted of simple phenogroups.
日本動物遺伝育種学会の論文