Using the vaiety egg ' s color limition of siverworm from romania and the black egg qingsong and by the crossbreeding , the egg ' s color and the egg number of f1 , f2 , f3 generations , as well as female and male proportion in black or white egg wene nvtigated after the quantity statistical analysis the gene and the gene heredity rule of egg ' s color limition , wene deriked the new system of white egg was kfained 摘要利用罗马尼亚引进的卵色限性品种与黑卵品种菁松，通过杂交育种，调查f1 ， f2 ， f3代的卵色及卵数，以及黑、白卵中的雌雄比例，经统计分析确定基因型，查明了卵色限性基因的遗传规律，并获得了新的白卵系。
As one of the contracted agricultural technology extension project in shanxi province , the jinnan cattle feeding and management technical package exte nsion project , assigned by science and technology committee of shanxi province i n 1999 , directed on the problems , such as extensive cattle feeding and managemen t , low sale percentage of commercial beef cattle , low meat production , low repro ductive survive rate of cows and poor economic returns , to increase the scientif ic contents and economic returns of cattle industry by adopting technical packag e including beef cattle crossbreeding , beef cattle feeding and management , cow ' s feeding and nutrition , calf raising , stover processing , and supplementation for grazing cattle in winter and spring etc “晋南牛饲养管理配套技术推广”是山西省科委1999年度下达“山西省农村技术承包”项目，其目的是针对我区广大农户养牛饲养管理粗放、商品牛出栏率低、产肉率低、母牛繁殖成活率低、经济效益差等缺点，通过采用肉牛杂交改良、改良肉牛饲养管理、加强母牛饲料营养、犊牛培育、秸秆氨化、放牧牛冬春补饲等配套技术，达到提高养牛业科技含量，增加养牛业经济效益的目的。
Crossbreeding of chlamys farreri were performed using the parent scallops from the korea wild population ( k ) , china cultured stock ( c ) and the survived individuals in epedimic waters in culture area of china ( cs ) . four crosses , k k , k c , k cs and c c , were constructed . the index of growth performance of their progenies such as the length and width of the shell and the individual weight were measured for heterosis study 用来自韩国野生的栉孔扇贝和中国养殖的栉孔扇贝以及发病区存活的个体作为亲本，构建韩国野生韩国野生、韩国野生中国养殖、韩国野生中国养殖发病区存活个体以及中国养殖中国养殖共四个交配组合，通过对f1代个体壳宽、壳高和体重的测量比较不同群体的生长情况。
