摘要
蒙古羊群体中的３种多脊椎羊（Ｔ１４Ｌ７，Ｔ１４Ｌ６，Ｔ１３Ｌ７）和普通羊（Ｔ１３Ｌ６）的比例在１９９６年的抽样调查结果分别为６．５７％，１９．６７％，６３．１９％，１０．５７％；胸腰椎总长度（Ｔ＋Ｌ）分别为５８．００ｃｍ，５５．００ｃｍ，５４．４７ｃｍ，５２．１３ｃｍ。当羊多１个胸椎时，脊柱平均加长２．４０ｃｍ；当羊多１个腰椎时，脊柱加长３．５０ｃｍ；当胸腰椎各多１个时，脊柱长度增加５．９０ｃｍ。１４个胸椎羊的眼肌面积比１３个胸椎的眼肌面积大２．４６ｃｍ２。多脊椎羊当年羔的活重，胴体重，净肉重分别比普通羊多４．７７～７．６１ｋｇ，４．１２～５．５９ｋｇ，３．３６～４．９０ｋｇ。多脊椎羊的产肉性能明显优于普通羊，有巨大的增产增值潜力，值得深入研究和推广应用。
A particular genetic characteristic of Mongolia sheep is that multivertebrae individuals are more than that of other breeds in the world.The vertebral formulas of thorocic and lumbar vertebrae in Mongolia sheep were T13L6(10.57%),T13L7(63.19%),T14L6(19.67%) and T14L7(6.57%) respectively.The thoracic and lumbar lengths of the four kinds of vertebral formular were 52.13 cm,54.47cm,55.00 cm and 58.00 cm respectively.The order of live weight,the carcass weight,the meat weight and the meat percentage were:T14L7>T14L6>T13L7>T13L6.Using multivertebrae sheep to improve mutton or wool sheep may be a new effective breeding method.
基金
国家自然科学基金
关键词
多脊椎蒙古羊
产肉性能
胸腰椎长度
基因突变
multivertebrae,lenghs of thoracic and lumbar, Mongolia sheep performance, Homeobox gene
