光照和埋植褪黑激素对内蒙古绒山羊氮分配和生产性能影响的研究  

Effects of photoperiod and implanted melatonin on nitrogen partitioning and production performance in Inner Mongolia white cashmere goats

作　　者：王林枫[1] 卢德勋[2] 孙海洲[2] 赵秀英[2] 珊丹[2] 

机构地区：[1]中国农业科学院畜牧研究所,北京100094 [2]内蒙古畜牧科学院,呼和浩特010030

出　　处：《中国农业大学学报》2006年第1期22-28,共7页Journal of China Agricultural University

基　　金：国家自然科学基金资助项目(30160062)

摘　　要：本试验从氮分配的角度用改变光照和埋植褪黑激素的方法研究日粮氮营养在绒山羊体内的分配机理及应用效果,用消化代谢试验测定总沉积氮(ΔNT),用同位素稀释技术和差减法活体测定体沉积氮(ΔNB=NB终-NB始),用差减法测得毛绒沉积氮(ΔNF=ΔNT-ΔNB)。结果表明,光照时间和埋植褪黑激素对绒山羊相关激素有显著影响:1)褪黑激素(MT)、胰岛素(INS)随光照时间的缩短而升高,埋植MT组显著高于对照组;催乳素(PRL)、类胰岛素促生长因子-I(IGF-I)、瘦素(LEP)随光照时间的缩短而降低,埋植MT组低于对照组;2)短光照(8 h)和埋植褪黑激素(1.86 mg/kg)组毛绒氮的分配比例与正常值相比增加了10%,而体氮分配比例减少10%;反之,在长光照和不埋植组毛绒氮分配比例减少而体氮分配比例增加;3)短光照和埋植褪黑激素组体脂肪含量增加(最高达到(24.67±1.41)%),而其他成分(体蛋白、体水分和体灰分)相应降低,长光照和不埋植组体脂肪含量降低(最低(14.16±0.59)%)而其他成分相应增加;4)试验期内短光照和埋植褪黑激素组绒山羊的产绒量平均增加(338.83±72)g,提高73.8%。绒毛各项品质指标均达到纺织工业标准的要求。本研究证明,绒山羊的氮分配、体成分和绒毛产量可以通过改变光照时间和埋植褪黑激素进行调控。Objective： This study investigated the mechanism of photoperiod and melatonin on nitrogen partitioning in Inner Mongolia White Cashmere goats in telogen in order to regulate the nitrogen partitioning between the body and the fur, further to promote cashmere production. Method： 18 castrated mature cashmere goats, 23-25 kg of liveweight, were divided into three groups at random, which were treated with different photoperiod（long daily photoperiod, LDPP; short daily photoperiod, SDPP; nature daily photoperiod, NDPP）, in each of the groups half of the goats were implanted melatonin. Total deposited nitrogen （ΔNT） was tested by general digestive and metabolism method, Body nitrogen deposited （ΔNB） was measured by isotope dilution technique of tritiated water at the beginning and the end of the experiment（ΔNB=NBE- NBB）, fur nitrogen deposited （ΔNF） were calculated by the formula of ΔNF = ΔNT-ΔNB. Results： Results showed that： 1）the hormones relative to nitrogen partitioning and body composition varied with different treatments, the level of MT, INS were increased with the declining of photoperiod, implanted groups were higher than those of non-implanted groups, there is a strong interaction between SDPP and melatonin implantation; PRL, IGF-I, LEP showed a reverse diversity way to MT and INS. 2） there is a significant difference in BN and FN partitioning in the different treatments of photoperiod and melatonin. The FN partitioning were increased with the declining of photoperiod, implanted groups were higher than those of non-implanted groups, the minimum and maximum percentage of nitrogen in LDPP and SDPP＋ MT were （23.6 ± 0.46） % and （36.1 ± 0.79） %, respectively. There is a strong interaction between SDPP and implantation of melatonin; while BN partitioning showed a reverse way to the photoperiod and implantation of melatonin; 3） body composition were dramatically changed in different treatment, body fat percentage were increased with the shortening of photoperiod,

关 键 词：光照 褪黑激素 绒山羊 氯分配 山羊绒 

分 类 号：S827.91[农业科学—畜牧学] Q493.9[农业科学—畜牧兽医]