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1、独龙牛生长发育规律的研究第25卷第2期2010年3月云南农业大学JournalofYunnanAgriculturalUniversityVoI.25No.2Mar.20l0独龙牛生长发育规律的研究王永奇,苟潇,文际坤,毛华明,苏八七,张勇(1.陕西省动物研究所,陕西西安710032;2.云南农业大学动物科学技术学院,云南昆明650201;3.云南省牧草与肉牛研究中心,云南昆明650212;4.云南省贡山畜牧局,云南贡山673100)摘要:通过对3月龄到132月龄87头独龙牛体重及主要体尺指标进行观测,构建了不同体尺性状与
2、体重间的回归关系,分析了不同类型牛的体尺指数.结果显示,独龙牛的早期生长速率最快,随着年龄增加,生长速率下降,到40～60月龄后生长基本停止,达到体成熟,整个生长期体重增长速率比其它指标快,成年公牛体重可达400kg,母牛可达350kg;成年公,母牛体高,十字高,体斜长,胸宽,胸围,髋宽,坐骨宽差异不显着(P>0.05),额大宽,管围差异极显着(P<0.01);早期独龙牛的体高较大,随着年龄的增加,体长的生长速度超过了体高,成年时体长大于体高;独龙牛具有较为典型的肉用和役用特征.关键词:独龙牛;体尺;生长;发育
3、中图分类号:S823.1文献标识码:A文章编号:1004—390X(2010)02—0063—06ResearchonGrowthandDevelopmentofDulongCattleWANGYong—qi',GOUXiao,WENJi—kun,MAOHua—ming,SUBa—qi,ZHANGYong(1.ShanxiInstituteofZoology,Xi'an710032,China;2.CollegeofAnimalScienceandTechnology,YunnanAgcuturalUniversity,K
4、unming650201,China;3.ResearchCenterofYunnanBeefCattleandForageGrass,Kunming650212,China;4.AnimalHusbandryBureauofGongshanCounty,YunnanProvince,Gongshan673100,China)Abstract:ThetargetofthisstudywastorevealtheregularityforthegrowingofDulongcattleinordertoprovidebasi
5、cdataforthefutureworkofbreedinganddevelopment.Throughtheobservationofthebodysizeandweightof87Dulongcattlewithagebetween3and132months,theregressionrelationwasconstructedbetweenthebodysizeandbodyweight,comparedthebodysizeindexofdifferenttypeofcattle.Theresultsshowed
6、thatthethegrowthrateofDulQngcattlewasthefastestinitsearlygrowthstage.Thegrowthratedescendedwithaging,ceasedanditreacheditsbodymaturitywhenitwas40to60monthsold.Theweightincreasingratewasfasterthantheotherindexes.Thebodyweightsofadultmaleandfemalecattlewere400kgand3
7、50kg,respectively.Thedifferencebetweenadultmaleandfemalecattlewasnotsignificant(P>0.05)inwithersheight,crossheight,bodylength,chestwidth,chestgirth,thurlwidth,ischiumwidthandSOon,whilethedifferencewasextremelysignifi—cant(P<0.O1)inforeheadwidthandshankcircum
8、ference.Thebodyheightexceededitsbodylengthatitsyoungagewhenthegrowthrateofbodylengthwasfasterthanthatofwithersheight.Thebodylengthwasfinallylongerthanth
