In this paper,comprehensively studied inhabit environments,population size,population density and distribution regions on wild yak,the results showed that genetic resource of wild yak has been decreased from 1950'...In this paper,comprehensively studied inhabit environments,population size,population density and distribution regions on wild yak,the results showed that genetic resource of wild yak has been decreased from 1950'to 1980',after that,and its genetic resource began to show increasing trend in nature reserves due to protection measures strengthened.展开更多
The ultrastructure in sperm of wild yak can be used to examined and assess truly and all round the function and fertilization ability of the sperms. The ultrastructure in the sperm of wild yak was investigated under d...The ultrastructure in sperm of wild yak can be used to examined and assess truly and all round the function and fertilization ability of the sperms. The ultrastructure in the sperm of wild yak was investigated under different states, such as fresh semen, frozen semen and capacitation sperm, and its characteristics were described by electron microscope. The sperm consisted of the head, neck and tail, the length was 78.34±7.24 μm. After capaeitation, the acrosome in sperm swelled and vesiculated, there were obvious vesicu]ation in the acrosome. The evagination on the ectoblast of acrosome formed the large vesiculation and inner membrane swelled. The evagination on the ectoblast of acrosome folded and tbrmed catenular vesiculation. The plasma membrane on the tail swelled. The head, neck and tail of the abnormal sperm were abnormal.展开更多
China has made efforts to protect wild yak （Bos mutus） species and prevent the hybrids between wild yak and domestic yak （Bos grunniens） species.At present,wild yak population of a reasonable estimate would be ove...China has made efforts to protect wild yak （Bos mutus） species and prevent the hybrids between wild yak and domestic yak （Bos grunniens） species.At present,wild yak population of a reasonable estimate would be over 70,000.Due to conservation efforts in environmental protection and ecological construction such as the Wildlife Protection and Nature Reserve Construction Project,the ＂Grain-for-Green＂ Project and the Natural Forest Resources Protection Project,the number of wild yaks is increasing.In general,Tibetan Plateau＇s ecosystem is getting better and its environmental quality shows a gradual improving trend.Tibetan Plateau is one of the world＇s cleanest regions called as the ＂Third Pole＂.In order to preserve the genetic pool of wild yaks,local pastoralists and polices drive off the wild male yaks from the domestic yak herds by making noise （banging washbasins,pots,etc.） or driving cars.Local government also incentivizes the culling of domestic yaks found in wild herds.For the sake of the biological and genetic features of this wild species,and the pastoralist way of life,wild yaks should continuously be protected to keep their genetic integrity.We appeal plans to investigate the gene pollution of wild yaks in some important distribution regions of this species.In the face of hybridizing with domestic yaks,proper guidance is urgently needed to address genetic pollution and protect the genetic integrity of wild yaks.展开更多
Wild yaks(Bos mutus)ranged across the Tibetan Plateau in large herds before being forced to remote areas of the plateau.Consequently,little has been published about their behavioral ecology.We present the first extens...Wild yaks(Bos mutus)ranged across the Tibetan Plateau in large herds before being forced to remote areas of the plateau.Consequently,little has been published about their behavioral ecology.We present the first extensive study on wild yak behavior during the rut.We gathered data on activity budgets,aggressive/sexual behaviors,and the behavior of bulls inside and outside mixed groups during 11 days in 2010 and 9 days in 2011.Yaks ate less and were more social during the rut than during summer.Males ate less than females and socialized more during the rut.We observed yaks for 234.25 h and recorded 2,078 aggressive/sexual behaviors.Yak bulls inspected and tended cows showing off their profiles during lateral displays,the most common type of indirect aggression.Yak bulls inside mixed sex groups rested less and socialized more than bulls outside.Females initiated intense intra-sexual competition and led at least 25 bulls on chases.Females then incited fight frenzies of numerous bulls from inside and outside the groups before copulations,and fights could be intense.We discuss female choice selecting for large size and fighting ability in males,the similarity of yak and bison(genus Bison)behavior,and conservation implications.展开更多
文摘In this paper,comprehensively studied inhabit environments,population size,population density and distribution regions on wild yak,the results showed that genetic resource of wild yak has been decreased from 1950'to 1980',after that,and its genetic resource began to show increasing trend in nature reserves due to protection measures strengthened.
文摘The ultrastructure in sperm of wild yak can be used to examined and assess truly and all round the function and fertilization ability of the sperms. The ultrastructure in the sperm of wild yak was investigated under different states, such as fresh semen, frozen semen and capacitation sperm, and its characteristics were described by electron microscope. The sperm consisted of the head, neck and tail, the length was 78.34±7.24 μm. After capaeitation, the acrosome in sperm swelled and vesiculated, there were obvious vesicu]ation in the acrosome. The evagination on the ectoblast of acrosome formed the large vesiculation and inner membrane swelled. The evagination on the ectoblast of acrosome folded and tbrmed catenular vesiculation. The plasma membrane on the tail swelled. The head, neck and tail of the abnormal sperm were abnormal.
基金supported by the National Natural Science Foundation of China (41571051)the Fundamental Research Funds for the Central Universities in Lanzhou University (lzujbky-2015-150)
文摘China has made efforts to protect wild yak （Bos mutus） species and prevent the hybrids between wild yak and domestic yak （Bos grunniens） species.At present,wild yak population of a reasonable estimate would be over 70,000.Due to conservation efforts in environmental protection and ecological construction such as the Wildlife Protection and Nature Reserve Construction Project,the ＂Grain-for-Green＂ Project and the Natural Forest Resources Protection Project,the number of wild yaks is increasing.In general,Tibetan Plateau＇s ecosystem is getting better and its environmental quality shows a gradual improving trend.Tibetan Plateau is one of the world＇s cleanest regions called as the ＂Third Pole＂.In order to preserve the genetic pool of wild yaks,local pastoralists and polices drive off the wild male yaks from the domestic yak herds by making noise （banging washbasins,pots,etc.） or driving cars.Local government also incentivizes the culling of domestic yaks found in wild herds.For the sake of the biological and genetic features of this wild species,and the pastoralist way of life,wild yaks should continuously be protected to keep their genetic integrity.We appeal plans to investigate the gene pollution of wild yaks in some important distribution regions of this species.In the face of hybridizing with domestic yaks,proper guidance is urgently needed to address genetic pollution and protect the genetic integrity of wild yaks.
文摘Wild yaks(Bos mutus)ranged across the Tibetan Plateau in large herds before being forced to remote areas of the plateau.Consequently,little has been published about their behavioral ecology.We present the first extensive study on wild yak behavior during the rut.We gathered data on activity budgets,aggressive/sexual behaviors,and the behavior of bulls inside and outside mixed groups during 11 days in 2010 and 9 days in 2011.Yaks ate less and were more social during the rut than during summer.Males ate less than females and socialized more during the rut.We observed yaks for 234.25 h and recorded 2,078 aggressive/sexual behaviors.Yak bulls inspected and tended cows showing off their profiles during lateral displays,the most common type of indirect aggression.Yak bulls inside mixed sex groups rested less and socialized more than bulls outside.Females initiated intense intra-sexual competition and led at least 25 bulls on chases.Females then incited fight frenzies of numerous bulls from inside and outside the groups before copulations,and fights could be intense.We discuss female choice selecting for large size and fighting ability in males,the similarity of yak and bison(genus Bison)behavior,and conservation implications.
