「まき牛」における産子の血液型による父親認定について

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  • PATERNITY TESTS IN PASTURING CATTLE BY BLOOD GROUPING
  • マキ ギュウ ニ オケル サンコ ノ ケツエキガタ ニ ヨル チチオヤ ニンテイ ニ ツイテ

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The paternity test may be necessary even on pasturing beef cattle in order to clarifythe pedigree of offspring, find out a bull carrying undesirable genes resulting in givingbirth to abnormal calves, and study tlte breeding behavior of bulls in pasture.In this investigation, the efficiency of various blood grouping systems for paternitycases involving two or more bulls was estimated from gene frequettcy data in JapaneseShorthorn cattle. The results actually obtained are shown below.(I) The expected probability of making exclusion for paternity cases involving twobulls by nine systems of red-cell antigens was 0.705, artd that by live protein types was0.490. It increased to 0.850, however, when estimated by the combined use of all tlaesystems.(2) In paternity cases involving more than two bulls, the probability of makingexclusion was calculated from the following formula: P.zP.Cn=1>, where P. is the prob-ability of exclusion in two bulls and n is the number of bulls involved. In pasturingJapanese Shorthorn cows with five bulls, the probability of making exclusion decreasedto 0.522.(3) In nineteen actual paternity cases in pasturing cattle, including three possiblebulls, about 84% of the cases were solved by all the systems combined.

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