光照和褪黑激素对内蒙古绒山羊氮分配的影响  

Effects of Photoperiod and Implanted Melatonin on Nitrogen Partitioning and Its Regulating Mechanism in Inner Mongolia White Cashmere Goats in Telogen

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：《畜牧兽医学报》2005年第12期1300-1306,共7页ACTA VETERINARIA ET ZOOTECHNICA SINICA

基　　金：国家自然科学基金资助项目(30160062)

摘　　要：从氮分配的角度研究了光照和褪黑激素对内蒙古白绒山羊营养分配的影响。结果表明:光照时间和埋植褪黑激素显著影响绒山羊体内氮物质分配,短光照或埋植褪黑激素显著提高绒山羊血液中的褪黑激素水平,并使其他相关激素如催乳素(PRL)、胰岛素(INS)、类胰岛素生长因子-I(IGF-I)、瘦素(LEP)的含量发生显著变化,结果使毛绒氮的沉积增加,体氮的沉积减少。短光照条件下毛绒氮和体氮的沉积分别为33.7%±0.64%和66.3%±0.64%;而长光照条件下则减少毛绒氮的分配量,增加体氮分配量,毛绒氮和体氮的沉积分别为23.6%±0.46%和76.4%±0.46%。短光照和褪黑激素之间有强烈的互作效应,短光照埋植褪黑激素组毛绒氮和体氮的分配比例分别为36.1%±0.79%和63.9%±0.79%。试验期绒山羊的产绒量平均增加(338.83±72)g,比普通绒山羊提高73.86%,新生羊绒的品质符合纺织工业标准的要求。This study investigated the effects of photoperiod and melatonin on nitrogen partitioning in Inner Mongolia White Cashmere goats in telogen in Inner Mongolia, north China. 18 castrated mature goats, 23-25 kg, were divided into three groups at random, each group including 6 goats were fed in pens in different rooms, which were treated with long daily photoperiod （LDPP： 16 L, 8D）, short daily photoperiod （SDPP： 8L, 16D） and natural daily photoperiod （NDPP）, respectively. The 3 goats in each group were implanted melatonin （1.68 mg/kg） monthly from February 20 to June 20. Total deposited nitrogen （TN） was tested by general digestive and metabolism meth- od. Body nitrogen deposited （BN） was measured by dilution technic of tritiated water at the beginning and the end of the experiment, cashmere and hair nitrogen deposited（C＆ HN） were calculated with C＆HN=TN-BN. Results showed there was a significant difference between LDPP and SDPP in BN and C＆HN. C＆HN in SDPP was higher than that of LDPP evidently, the corresponding was 33.7%±0.64% vs 23.6%±0.46% （P〈0. 01）, on the other hand, BN in SDPP was much lower than that of LDPP, the corresponding was 66.3 %±0.64 % vs 76.4 %±0. 46% （P〈0.01）. Intensive interaction between SDPP and implanted melatonin was also observed, the corresponding was 36.1%±0.79% for C＆HN and 63.9%±0. 79% for BN （P〈0.01）. Study showed that the hormones relative to nitrogen partitioning varied with different treatments. The level of blood melatonin was decreased with the increasing of photoperiod, implanted groups were higher than unimplanted groups. Hormones relative to protein increasing, such as PRL, IGF-I were increased with the length of photoperiod, implanted groups were lower than unimplanted groups. INS, which was related to the fat synthesization, was decreased with increasing of photoperiod, implanted groups were higher than unimplanted groups. LEP, which was related to the fat degenera- tion was increased with increasing of photope

关 键 词：光照 褪黑激素 氮分配 激素 作用机理 

分 类 号：S827.5[农业科学—畜牧学]