馬の〓癖素質の遺伝に就いて

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I have studied the cause of wind-sucking on the assumption that hereditary dispositions may play an important part in its forming. Investigations have been carried out about half-bred horses older than 5 years that are now being or were bred in the National Live-stock Breeding Stations (N. L. S.), and also pure-bred older than 3 years bred in some private Breeding Farms (P. B. F.). The results obtained are as follows:(1) Frequency of wind-sucking.The percentages of the habit for total numbers of horses now feeding in N. L. S. are as follows:Total Number Number acquired the habit Percentage 1.503 16 1.1%From this data, we know that 1.1 percent is the general frequency of the habit.Table II summalizes total numbers of horses acquired the habit in N. L. S. for about 25 years and those in P. B.S.We recognize that wind-sucking occurs more frequently especially in some pedigrees.Table II shows the frequency of the habit in some pedigrees.From this table, it is cleared up that some pedi grees show much higher percentages than the general frequency of the habit and others quite negative. We may suppose that the former transmits the dis position to its offsprings.Fig. I and II. show some pedigrees as instances.(2) The inheritant mode of wind-sucking dis positions.It is a very difficult problem to conclude their inheritant mode. Although, thinking from the in stances noted above, we may suppose that the dis position might be recessive charactors.
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馬の〓癖素質の遺伝に就いて

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