Regulate the body ' s immune , no drug resistance , non - toxic side effects , enhanced immune function , anti - stress enhanced ability to resist infection and ensure the regularity that the gene stream , energy stream and matter stream works in the animal gut micro flora system to accelerate animal growth 调节机体免疫,无耐药性,无毒副作用,增强免疫功能,增强抗应激能力抵御感染,保证了动物肠道微生态系统中基因流、能量流和物质流的正常运转,使畜禽生长加快。
The study of different deteriorated grasslands showed , although occurring genetic differentiation and reduced genetic diversity , biodiversity in deteriorated population can still maintain a high level . additionally , it had gene exchanges with normal populations . the deteriorated grassland can restore its vegetation as normal if rational management was adopted 不同退化系列,克氏针茅种群虽发生了遗传分化,遗传多样性略有降低但仍维持较高的水平,且与正常草地间有基因流,只要采取合理的草地利用措施,减轻放牧压力,退化草地即可恢复,若采取人工补播正常种群种子,将会加快退化种群的恢复进程。
Populations over maowusu sandy grassland ( nm = 5 . 9529 ) . it suggested that relatively limited gene flow might be one of important factors influencing on the genetic structure of the species . in addition , through the correlation analysis , we observed the correlation between the genetic distance of p . sibirica and latitude , longitude and altitude was not significant 叉毛蓬亚居群的基因流n _ m = 1 . 138 ,低于一般广布种的基因流水平( n _ m = 1 . 881 ) ,且远低于毛乌素沙地柠条的基因流( n _ m = 5 . 9529 ) ,相对有限的基因流可能在叉毛蓬居群遗传分化的维持中起着作用。
Gene flow estimates among populations were higher even though the minimum geographical distance between any pair of populations is over 60km and could be attributed to the activity of bee - pollinators locally . we show the reason of high gene flow ( nm = 37 ) that it may result from the mechanism of pollination of e . mollis 根据间接法测得的基因流nm = 37 ,说明虽然任何两个种群之间的地理距离超过60km ,但种群间仍然有很高的基因流,这可能是由于大量的蜂群存在于当地的原因。
Based on these results , the strategies for conservation e . mollis population to prevent the isolation and fragment of the populations and maintain the high genetic variation among the populations . moreover , it should be avoid the decline of gene flow was resulted from the isolation of the populations so that resulted in the differentiation and genetic decline of the population . finally , it should be adopt some method to spread continuous distribution and extend genetic diversity of the population 针对翅果油树的遗传结构和遗传多样性的研究结果,提出了保护翅果油树种群的策略:维持现有翅果油树种群高的种内遗传变异水平,遏制由于人为原因而导致的翅果油树种群隔离或片段化的趋势,防止由于种群隔离造成基因流降低,从而引起种群分化和种群的遗传衰退,并采取适当措施扩大种群的连续性和种群内的遗传多样性水平。
The gene flow among the subpopulations of reawnuria soongorica ( mn = 1 . 1028 , nm > 1 ) was much less than that of the common anemophytes ( atm = 5 . 24 ) , so the species was in the critical state of genetic differentiation to some extent the results of amova showed that there were 61 . 58 % of the total genetic variations existing among the subpopulations , and 38 . 02 % within them 红砂亚种群间的基因流nm = 1 . 1028 , nm 1但低于一般风媒传粉植物( nm = 5 . 24 )的基因流水平,处于分化的临界状态。 amova分析说明红砂种群变异的61 . 58存在于亚种群内,而亚种群间的变异占总变异的38 . 02 。
Several results were concluded : firstly , the population of t . jackii was decreasing sharply and its living area was contracting , so the percentage of genetic variance among t . jackii populations was lower than that within its population ; secondly , its genetic diversity index was relatively high ; thirdly , according to its gene flow index , the population disintegration of the species could be prevented by genetic communication among populations of the species ; finally , the similar index between the populations from jiangshi nature reserve and from xufan reservoir was higher than that between the populations from jiangshi nature reserve and from xufanggeng , corresponding with the fact that it is nearer between jiangshi nature reserve and xufan reservoir than that between jiangshi nature reserve and xufanggeng 2 、长叶榧的遗传多样性分析,分析了多态位点百分率( percentageofpolymorphicsites ) 、 nei氏基因多样性指数( nei ’ sgenediversityindex ) 、 shannon信息指数( shannon ’ sinformationindex ) 、居群间的相似系数( geneticsimilarityindex )和遗传距离( geneticdistance ) 、遗传变异在居群间和居群内的分布( thepercentageofvarianceamongandwithinpopulation )及基因流( geneflow ) 。结论是:分布在群体间的遗传变异较分布在群体内的遗传变异小,说明该生物的分布范围越来越狭小。