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No.30 (1983/11) >

Title :黒毛和種の登録時の体型測定値の統計遺伝学的分析(畜産学科)
Title alternative :Statistical genetic analysis of body measurements in Japanese Black Cattle (Department of Animal Science)
Authors :新城, 明久
Authors alternative :Shinjo, Akihisa
Harvey, Walter R.
Issue Date :19-Nov-1983
Abstract :沖縄県における黒毛和種基本登録雌牛の登録時の体型測定値(体高, 胸囲, 胸深, 腰角幅および〓幅)に対する産地, 飼養地, 年次, 季節および年次と季節の交互作用の効果について比較検討した。さらに測定値間の表型相関, 遺伝相関および遺伝率を推定した。分析に用いた黒毛和種は1973年から1977年の5年間に沖縄県家畜改良協会に登録された基本登録雌牛4,584頭である。集団平均月齢, 27.44カ月齢に体型測定値を補正した時の群全体の最小自乗平均と標準誤差は, 体高119.06±0.27cm, 胸囲167.82cm±0.77cm, 胸深61.93±0.26cm, 腰角幅43.60±0.24cmおよび〓幅41.31±0.19cmであった。産地間では石垣島, 久米島, 宮古島および伊是名島が優れ, 与那国島, 竹富島および伊江島が劣っていた。県外からの導入牛では鳥取県, 鹿児島県および宮崎県産が優れ, 岡山県と島根県が劣っていた。他県からの導入牛を含めて飼養地間で比較すると, 宮古島, 久米島および伊江島が優れ, 与那国島, 竹富町, 石垣島および伊是名島が劣っていた。年次間では1975年を最低とした2次曲線を示した。季節間では夏子がよく, 冬子は劣っていた。年次と季節間にはいくつかの組み合せで交互作用がみられた。5つの測定値相互間に0.417∿0.746の表型相関と0.606∿0.981の遺伝相関がみられた。遺伝率と標準誤差は, 体高0.281±0.046,胸囲0.493±0.053,胸深0.449±0.051,腰角幅0.312±0.047および〓幅0.235±0.045であった。
Five body measurements in the heifers of Japanese Black Cattle were analyzed to determine the following effects; places of birth and raising, year, season and year season interaction. The genetic parameters estimated were phenotypic and genetic correlations and heritability. The animals used were 4,584 heifers which had been registered in the Okinawa Animal Breeding Association from 1973 to 1977. Overall least-squares means and heritability estimates with standard error for wither height, chest girth, chest width, hip width and thurl width were 119.06±0.27cm; 0.281±0.046,167.82±0.77cm; 0.493±0.053,61.93±0.26cm; 0.449±0.051,43.60±0.24cm; 0.312±0.047 and 41.31±0.19cm; 0.235±0.045,respectively. Age of heifers were adjusted for each cattle to 27.44 months as their age varied from 16 to 36 months. Body measurements were compared among places of birth within Okinawa prefecture. The body size of heifers in Ishigaki, Kume, Miyako and Izena islands was larger than those in Yonaguni, Taketomi and Izena islands. Comparing the body measurements among the birth places of brought heifers, heifers born from Tottori, Kagoshima and Miyazaki prefectures were larger than those from Okayama and Shimane prefectures. The body size of heifers in Miyako, Kume and Ie islands were larger than those raised in Yonaguni, Taketomi, Ishigaki and Izena islands. Yearly means of the body measurements showed a quadratic trend for the body measurements which had bottom in 1975. The body size of heifers born in summer was larger than for heifers born in spring. The interactions between year and season were significant in some combinations. The ranges of phenotypic and genetic correlations among the five body measurements were 0.417 to 0.746 and 0.606 to 0.981,respectivey.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/4005
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.30 p.499 -506
Appears in Collections:No.30 (1983/11)

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