@article{oai:miyazaki-u.repo.nii.ac.jp:00003419,
 author = {仲井, 亜紀 and 原田, 宏 and HARADA, Hiroshi and 武田, 和也 and 石田, 孝史 and ISHIDA, Takafumi and 川田, 洋一 and 大山, 敏 and 横山, 喜世志 and 徳丸, 元幸 and 清野, 滋美 and NAKAI, Aki and TAKEDA, Kazuya and KAWATA, Yoichi and OYAMA, Toshi and YOKOYAMA, Kiyoshi and TOKUMARU, Motoyuki and KIYONO, Shigemi},
 journal = {宮崎大学農学部研究報告, Bulletin of the Faculty of Agriculture, Miyazaki University},
 month = {Mar},
 note = {産肉能力の優れた種雄牛を作出するためには,早期に,かつ正確に選抜する手法の確立が急務である。そこで,枝肉形質超音波推定値,体測定値および検定期間中の飼料効率,増体量等を用いて種雄牛候補牛の持つ多様な形質から選抜対象とすべきいくつかの形質を基に総合選抜の可能性を検討した。検定終了時の7-MLTA,13-MLTAおよびMSは体高に対して負の相関を示した。16カ月齢時の7-MLTA,13-MLTA,RTおよびMSは互いに正の相関関係を示した。また,16カ月齢時の7-MLTAは,検定期間中の体高増加量に対し負の相関を示した。検定期間中の増体量と16および20カ月齢時のMS間および粗飼料要求率と7ごMLTAおよびMSとの間では負の相関を示した。また,主成分分析を行った結果,検定終了時および16カ月齢時ともにPC-1は牛体のサイズに関する因子,PC-2はエネルギー要求率に関する因子と考えられた。総合選抜の可能性を検討するために重回帰分析を行った結果,検定終了時では約67〜81%,また,16カ月齢時では約61〜65%の寄与率を示した。, The establishment of techniques for early and accurate selection is in urgent need of producing breeding sire with superior meat production performance. In this study, ultrasonic estimates of carcass traits, body measurments, feed. Efficiency and live weight gain during performance testing were used to investigate possibilities of selecting superior breeding bull based on these traits. 7-MLTA, 13-MLTA and MS of bulls at the end of performance testing showed negative correlation to withers height. The partial correlation coefficients among 7-MLTA, 13-MLTA, RT and MS at 16 months of age were all positive each other. However, 7-MLTA at 16 months of age showed negative correlation to growth rates of withers height of bulls during performance testing. Weight gain during performance testing was also negatively correlated to MS at 16 and 20 months of age. The roughage conversion ratio was negatively correlated to 7-MLTA and MS at 16 and 20 months of age of bulls. The results of principal component analysis suggested PC-1 was the factor of body size at the end of performance testing and 16 months of age. PC-2 was estimated as the factor of energy conversion ratio at the end of performance testing and 16 months of age. The percentages of variation explained were 67〜81 % for selecting superior breeding bulls at the end of performance testing and also were 61〜65% at 16 months of age by use of step-wise multiple regression equations.},
 pages = {41--48},
 title = {種雄牛総合選抜への超音波利用に関する研究},
 volume = {49},
 year = {2003},
 yomi = {ナカイ, アキ and ハラダ, ヒロシ and タケダ, カズヤ and イシダ, タカフミ and カワタ, ヨウイチ and オオヤマ, トシ and ヨコヤマ, キヨシ and トクマル, モトユキ and キヨノ, シゲミ}
}