黄羊年龄鉴定指标的比较分析

对随机抽取的388号黄羊(Procapra gutturosa)某些指标(牙齿生长替换及磨损度、I牙冠比、体重、前臂长、后足长、尾长、眶间宽、身长、头长)与性别、年龄相关性的分析表明:前面项指标无显著性性别差异,且与年龄显著相关,可以单独作为年龄鉴定指标;后七项指标具显著性性别差异,与年龄关系不密切,只能用于区分成幼或3.5岁以前的年龄鉴别。另外发现高龄个体的牙齿磨损速度有降低的趋势,性成熟年龄雌性有超前雄性一年的趋势。     

SEPARATING BROWN AND BLACK BEARS IN NORTHEAST CHINA USING TOOTH MEASUREMENTS

BearisveryvaIuableeconomicanimal.BearresourcereducedsharplywithMan'sexploitingandutilizingonnatufe,wbrseningofecologicalenvirorunent.Itisveryvaluabletoaccumulatebasicbiologicaldataofbcarre-searchinordertostudybcarpopulationecol-ogyindetail,providescientificbasisforbearresourcemanagement,thcnccdofarchacologr'andthestUdy'onthedataofnatUraldeathinfield.Toothisthemostdifficultdecomposedpall,sotheywillprovidcalotofinformationduringtheproccssofstudyonarchaeologyandnatllfaldeathindividual.Itisavery…     

Food habits and selective grazing of Mongolian gazelle (Procapra gutturosa) in Hulunber Grassland

IntroductionMongoliangazelle(PrOCSPraguttuross)isaspecialruminantspeciesthathasnumerouspopulationsintheeasternpaFtofNetMonggolGrasslandandasignificantcomponentofthegrasslandecosystem.Thisspecieshasthehabittoselectspeciesandqualityofplantstograze.However,thepopulationhasdecreaseddramaticallyandfacesextinctioninChina(JiangetSI.1998).Therefore,itisveryimportanttostudythefoodhabitsandfoodchoicebyMongoliangazelleforpromotingtheprotectionandmanagementofremainingpopulation.Inapreviouspaper(Gao…     

Nitrogen and fiber concentration in rumen contents and fecescontents of Mongolian gazelles

lntroductionWiIdlifemanagersdesirereIiableindicatorsofnu-tritionaIstatusoffree-rangingunguIatestoassessreIationshipsbetWeenhabitatsandpopuIations.ThenutritionaIconditionofunguIatesisstrongIyaffectedbytheirfOodquality,andasunguIatesreguIarlyexpe-riencenitrogenshortages(White1978IRobbins1983),itispaFticuIarlyimportanttoknowthenitrogenconcentrationoftheirfoodpIants.onecommonmethodofestimatingquaIityofungulatedietsisana-IysisnutritionaIquaIityofforagepIantsgrowinginhabitats.However,indisc…     

黑龙江省黄鼬的生物学特性及合理利用对策

根据黑龙江省黄鼬（Ｍｕｓｔｅｌａ ｓｉｂｉｒｉｃａ）的生物学特性、分布和资源现状对黄鼬资源的保护和合理利用提出如下对策：１、加强资源保护，提高宣传力度；采用新型化学灭鼠药品并尽量采用招引黄鼬的生物学防治鼠害的方法，加强对毛皮市场的管理和控制。２、合理开发利用，制定合理的狩猎政策。（１）性比：控制在雄性比例下降至５６％左中；（２）成幼比例：成体比例达到２１－２３％，幼体和成雌比例降到６：１以下，成雄     

Weight contributions of stomach compartment and organs to body weight of Mongolian gazelles

lntroductionOfaIImammals,theruminantshavethemostdif-ferentiated,specializedandcompIexstomachs,whichappeartobethebestsuitedfordigestingandutiIizingfeedrichincellulose.Hofmann(1972)statedthattheruminantstomachwasstructuraIIyadaptedtoutilizecertaindistincttypesoffoodattercomprehen-siveIycomparedthestomach-structureof26of31easternAfricanruminants.Accordingtotheirstom-ach-structureandfoodfeature,theseruminantsmaybegroupedintothreemaintypesoffeeder'a)bulkandroughageeaters(grazers)lb)seIectorsofju…     

世界驯鹿的数量分布及动态

已知世界驯鹿（Rangifer tarandus)为184群，其中北美洲有102群，欧洲55群，亚洲24群，南乔治亚3群，总数达330到390万头，其中的九大群占驯鹿总数的75％，12万头以上的七大群是用航空统计的，其数量持续增长；对数量在2万到12万头的鹿群多采用航空条带截样法，对较小的鹿群多采用全群计数的方法，1979年至1985年北美驯鹿群的83％，欧洲的88％，亚洲的68％是稳定或增长的。     

黄羊食物营养质量的初步研究

研究测定了１４种黄羊主要饲料植物和５１头黄羊瘤胃内食物的粗蛋白质、中性洗涤性纤维、酸性洗涤性纤维、酸性洗涤性木质素、中性洗涤性纤维灰分、酸性洗涤性纤维灰分、纤维素和半纤维素的含量。结果表明,各类饲料植物中营养成分的含量存在显著差异（Ｐ〈０．０５）,而且具有明显的季节性变化：春季粗蛋白质的含量最高,冬季最低。洗涤性纤维和木质的季节变化则相反,春季最低,冬季最高。瘤胃内食物的营养成分季节变化模式与饲料植物相似,同一时期,瘤胃内食物的营养成分要高于饲料植物。中性洗涤性纤维与粗蛋白质呈显著的线性负相关性,与其它营养成分则是显著的线性正相关性。