日本短角種本登録牛の遺伝学的分析

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書誌事項

タイトル別名
  • Genetic Analysis of the Registered Japanese Shorthorn Cattle
  • ニホン タンカク タネホン トウロクギュウ ノ イデンガクテキ ブンセキ

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抄録

Since 1871, the Japanese Shorthorn was developed by crossing Shorthorn with native Nanbu breed kept in Aomori, Iwate and Akita Prefectures in Japan. In 1957, the Japanese Shorthorn Society was formed. Up to December 31, 1972, 68 bulls and 351 cows have been registered as excellent grade. In order to clarify the breeding structure of these cow and bull populations, except for 2 cows and 8 bulls imported from foreign countries, percent genetic contributions of important animals and important breeders were estimated by WIIENER'S method by using full pedigree records for two generations of these cattle. Trends in the values of the average inbreeding coefficient and inter-se relationship coefficient were also examined. 1) The greatest contribution of imported bull was Banjo's 6.67 percent to bull population and 4.58 percent to cow population. The total genetic contribution of imported bulls was 14.13 percent to bull population and 8.38 percent to cow population. It showed that about 10 percent of the genes in both populations were derived from these bulls imported since 1955. 2) Breeding animals which contributed over 3 percent to both populations were three bulls (named Sasagawa, Yamazakura and Michikumo) and one cow (named Simoai).These indigeneous breeding animals were bred at Oou Livestock Breeding Station, Ministry of Agriculture, in Aomori Prefecture. 3) Percent genetic contribution of Oou Livestock Breeding Station was 36.74 to cow population and 42.92 to bull population. This National Livestock Breeding Station could be considered as the most influential breeder in the improvement of Japanese Shorthorn. 4) The inbreeding coefficients of bull and cow populations were 1.25 and 0.54 percent, respectively. The inter-se relationship coefficients for both populations in different periods of time showed 1.4-6.38 percent.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 45 (5), 262-270, 1974

    公益社団法人 日本畜産学会

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