饲粮锌水平对生绒期陕北白绒山羊生长性能、产绒性能及绒生长相关激素含量的影响  

Effects of Dietary Zinc Level on Growth Performance,Cashmere Performance and Cashmere Growth-Related Hormone Contents of Shanbei White Cashmere Goats during Cashmere Growing Period

作　　者：白玉恒 王荣斌 刘锦旺 胡飞飞 杨钊 高玉平 屈雷[2] 黄帅[2] 陈玉林[1] BAI Yuheng;WANG Rongbin;LIU Jinwang;HU Feifei;YANG Zhao;GAO Yuping;QU Lei;HUANG Shuai;CHEN Yulin(College of Animal Science and Technology,Northwest A&F University,Yangling 712100,China;Shaanxi Province Research Center of Shanbei Cashmere Goat of Engineering&Technology,Yulin University,Yulin 719000,China;Yulin City Institute of Husbandry and Veterinary Research and Technology Popularization,Yulin 719000,China;Tong Town Animal Husbandry and Veterinary Station of Jia County in Shaanxi Province,Yulin 719200,China)

机构地区：[1]西北农林科技大学动物科技学院,杨凌712100 [2]榆林学院,陕西省陕北绒山羊工程技术研究中心,榆林719000 [3]榆林市畜牧兽医研究与技术推广研究所,榆林719000 [4]陕西省佳县通镇畜牧兽医站,榆林719200

出　　处：《动物营养学报》2018年第6期2202-2208,共7页CHINESE JOURNAL OF ANIMAL NUTRITION

基　　金：陕西省重点研发计划项目(2017NY-078);榆林市科技计划项目(2016cxy-06);榆林学院高层次人才科研启动项目(16GK05);陕西省科技统筹创新工程计划项目(2015KTTSNY04-05)。

摘　　要：本试验通过研究饲粮锌水平对生绒期陕北白绒山羊生长性能、产绒性能及绒生长相关激素含量的影响,旨在确定生绒期陕北白绒山羊饲粮适宜的锌水平。采用单因素随机区组设计,将32只体况良好及体重相近的8月龄陕北白绒山羊随机分为4组,每组4个重复,每个重复2只。对照组(Ⅰ组)饲喂基础饲粮(锌水平为28.57 mg/kg DM),3个试验组(Ⅱ、Ⅲ、Ⅳ组)分别饲喂在基础饲粮中添加饲料级硫酸锌的试验饲粮,试验饲粮锌水平依次为50、70和100 mg/kg DM,预试期15 d,正试期6个月。结果显示:1)饲粮锌水平对陕北白绒山羊干物质采食量(DMI)及料重比(F/G)均无显著影响(P>0.05)。Ⅲ组山羊的平均日增重(ADG)最高且与Ⅰ组差异显著(P<0.05),而与其他2组差异不显著(P>0.05)。2)饲粮锌水平对试验初和试验末羊绒细度及产绒量均无显著影响(P>0.05)。试验末羊绒长度Ⅲ组显著大于Ⅰ组(P<0.05),而Ⅳ组则极显著大于Ⅲ组(P<0.01),显著大于Ⅱ组(P<0.05)。Ⅲ组羊绒生长量及羊绒生长率均显著高于Ⅰ组及Ⅳ组(P<0.05),与Ⅱ组无显著差异(P>0.05)。3)随着陕北白绒山羊生绒期的推进,血清褪黑激素(MT)、胰岛素样生长因子-1(IGF-1)及生长激素(GH)含量均呈现增加趋势,而血清催乳素(PRL)含量则呈降低趋势。饲粮锌水平对陕北白绒山羊试验期内血清MT、PRL含量及试验中期GH含量均无显著影响(P>0.05)。试验中期Ⅲ组血清IGF-1含量显著高于Ⅳ组(P<0.05)。试验末期Ⅲ组血清IGF-1含量显著高于Ⅰ组及Ⅳ组(P<0.05)。试验末期Ⅲ组血清GH含量显著高于Ⅰ组(P<0.05)。综上,生绒期陕北白绒山羊饲粮适宜的锌水平为70 mg/kg DM。This experiment was conducted to study the effects of dietary zinc level on growth performance,cashmere performance and cashmere growth-related hormone contents of Shanbei white cashmere goats during cashmere growing period,in order to determine the optimal dietary zinc level of Shanbei white cashmere goats during cashmere growing period.The experiment was designed in a single factor random block.Thirty-two Shanbei white cashmere goats at 8 months of age with physical fitness and similar weight were selected and di-vided into 4 groups with 4 replicates per group and 2 goats per replicate.The goats in control group(groupⅠ)were fed a basal diet containing 28.57 mg/kg DM zinc,and the goats in experimental groups(groupsⅡ,ⅢandⅣ)were fed the basal diet supplemented with zinc sulfate(feed grade),and the dietary zinc level of the experimental diets was 50,70 and 100 mg/kg DM respectively.The pre-test period was 15 days and the formal test period was 6 months.The results showed as follows:1)dietary zinc level had no significant influences on dry matter intake(DMI)and feed/gain(F/G)of Shanbei white cashmere goats(P>0.0 5).Goats in groupⅢhad the greatest average daily gain(ADG),and the ADG in groupⅢhad significant difference compared with groupⅠ(P<0.05),while had no significant difference compared with groupsⅡandⅣ(P>0.05).2)Dietary zinc level had no significant influences on cashmere diameter at initial experiment and last experiment and cashmere production(P>0.05).Cashmere length in groupⅢwas significantly higher than that in groupⅠ(P<0.05).Cashmere length at last experiment in groupⅣwas significantly higher than that in groupsⅢandⅡ(P<0.01 and P<0.05,respectively).Cashmere growth and cashmere growth rate in groupⅢwere significantly higher than those in groupsⅠandⅣ(P<0.05),and no significant difference was ob-served between groupsⅢandⅡ(P>0.05).3)With the succession of cashmere growing period,melatonin(MT),insulin like growth factor-1(IGF-1)and growth hormone(GH)contents in serum of goat

关 键 词：饲粮锌水平 陕北白绒山羊 产绒性能 激素 

分 类 号：S816[农业科学—饲料科学]