建立高分辨熔解曲线技术同时快速检测鸡肉中沙门氏菌、单增李斯特菌、金黄色葡萄球菌和空肠弯曲菌。本研究分别以上述4种菌的fimY、hly、nuc和orfC特异性基因为靶基因,建立能同时检测多种食源性致病菌的多重HRM-real time PCR检测体系,...建立高分辨熔解曲线技术同时快速检测鸡肉中沙门氏菌、单增李斯特菌、金黄色葡萄球菌和空肠弯曲菌。本研究分别以上述4种菌的fimY、hly、nuc和orfC特异性基因为靶基因,建立能同时检测多种食源性致病菌的多重HRM-real time PCR检测体系,并对反应的特异性、灵敏度、重复性以及在人工染菌样品进行了评价。所建立的HRM-real time PCR检测体系对沙门氏菌、单增李斯特菌、金黄色葡萄球菌和空肠弯曲菌均产生特异性熔解曲线,Tm值分别为82.2℃、78.2℃、75.5℃和73.5℃;多重HRM-real time PCR反应体系检测单一致病菌菌液的灵敏度均为102拷贝数/mL,检测多种致病菌菌液的灵敏度为102拷贝数/mL;该反应体系重复性的试验内CV值在0.03%~0.32%之间,试验间CV值在0.45%~2.12%;人工染菌样本对4种菌的检测限均能达到5 CFU/25 g。结果表明该多重HRM-real time PCR检测体系可对上述4种禽肉中常见致病菌进行有效的检测与区分,特异性强,灵敏度高,反应重复性好,有望在食源性致病菌检测分析中发挥作用。展开更多
[Objective]In order to compare the general egg qualities and mineral element contents of different layers,six commercial breeds in brown shell layer,including Lohmann,Jinghong,Hyline,Xinyang,Hisax,ISA,Suqing green she...[Objective]In order to compare the general egg qualities and mineral element contents of different layers,six commercial breeds in brown shell layer,including Lohmann,Jinghong,Hyline,Xinyang,Hisax,ISA,Suqing green shell layer and Wenchang chicken were used as materials.The general egg quality traits and mineral elements contents of eight breeds at 43 weeks old were mensurated.[Result] There were significant differences in general egg qualities(except yolk weight)of eight breeds.About the mineral element contents,the differences were significant only in P,Mn and Se of some breeds in this experiment.[Conclusion]The results in this study could provide the reference for further researcher,layer producers,nutritionists,consumers and so on.展开更多
[Objective]In order to research on effect of different content of cottonseed meals on production performance and egg quality of Hisex laying hens. [Methods]120 Hisex laying hens of 37 weeks old are chosen,randomly div...[Objective]In order to research on effect of different content of cottonseed meals on production performance and egg quality of Hisex laying hens. [Methods]120 Hisex laying hens of 37 weeks old are chosen,randomly divided into four groups and three repetitions are set in each group,there are 10 hens in each repetition. Group I is the control group,II,III and IV are experimental groups. Cottonseed meal contents are respectively 5%,10% and 15%,with test cycle of 10 weeks,effects of different cottonseed meal dosages on Hisex laying hens production performance and egg quality are observed. [Results]When the diet is added with 5% to 15% of cottonseed meal,the average laying rate,average egg weight and feed-gain ratio all show downward trends when compared with that of the control group,but with no significant difference( P > 0. 05); eggshell strength,eggshell thickness,Haugh unit,egg shape index all show no significant difference( P >0. 05),with the increasement of cottonseed meal,the color of egg yolk got brighter,egg yolk color of 15% added group increased by 12%,show a significant difference with that of control group( P <0. 05). [Conclusion]When the feed was added with 15% cottonseed meals,it has an unconspicuous effect on laying performance and egg quality of Hisex laying hens,but whether it had an effect on animal health and food safety or not,a further systematic research is needed.展开更多
The Nei's improved genetic distance(DA)and gene flow(Nm)were measured using sixteen microsatellite markers.Dendograms based on DA genetic distance using the neighbor-joining(NJ)method and STRUCTURE program were co...The Nei's improved genetic distance(DA)and gene flow(Nm)were measured using sixteen microsatellite markers.Dendograms based on DA genetic distance using the neighbor-joining(NJ)method and STRUCTURE program were constructed to analyze the genetic structure and relationship among 10 Chinese indigenous chicken breeds.The results showed that dendograms of DA genetic distance using the NJ method divided the 10 chicken breeds into two main clusters;one consisted of breeds of low weight body(CHA,TTB,XIA,GUS and BAI),the other contained heavier breeds(LAN,DAG,YOU,XIS and LUY).In the lighter breeds,TIB and CHA clustered together,as did XIA and GUS.In the heavier breeds,XIS and LUY was clustered together in one branch,but LAN,DAG and YOU clustered in independent branches.The results were consistent with Nm estimates among the 10 indigenous chicken breeds.The STRUCTURE program properly inferred the presence of genetic structure despite not pre-defining the origin of individuals.The genetic cluster inferred by STRUCTURE was basically the same as that from the DA distance clustering method.An advantage of the STRUCTURE program was its ability to identify the migrants and admixed individuals in the 10 chicken populations;this could not be achieved by use of the DA distance clustering method.展开更多
文摘建立高分辨熔解曲线技术同时快速检测鸡肉中沙门氏菌、单增李斯特菌、金黄色葡萄球菌和空肠弯曲菌。本研究分别以上述4种菌的fimY、hly、nuc和orfC特异性基因为靶基因,建立能同时检测多种食源性致病菌的多重HRM-real time PCR检测体系,并对反应的特异性、灵敏度、重复性以及在人工染菌样品进行了评价。所建立的HRM-real time PCR检测体系对沙门氏菌、单增李斯特菌、金黄色葡萄球菌和空肠弯曲菌均产生特异性熔解曲线,Tm值分别为82.2℃、78.2℃、75.5℃和73.5℃;多重HRM-real time PCR反应体系检测单一致病菌菌液的灵敏度均为102拷贝数/mL,检测多种致病菌菌液的灵敏度为102拷贝数/mL;该反应体系重复性的试验内CV值在0.03%~0.32%之间,试验间CV值在0.45%~2.12%;人工染菌样本对4种菌的检测限均能达到5 CFU/25 g。结果表明该多重HRM-real time PCR检测体系可对上述4种禽肉中常见致病菌进行有效的检测与区分,特异性强,灵敏度高,反应重复性好,有望在食源性致病菌检测分析中发挥作用。
基金Supported by National Science and Technology Support Program (2012BAD39B04-3)Yangzhou city societal development item (YZ2010080)
文摘[Objective]In order to compare the general egg qualities and mineral element contents of different layers,six commercial breeds in brown shell layer,including Lohmann,Jinghong,Hyline,Xinyang,Hisax,ISA,Suqing green shell layer and Wenchang chicken were used as materials.The general egg quality traits and mineral elements contents of eight breeds at 43 weeks old were mensurated.[Result] There were significant differences in general egg qualities(except yolk weight)of eight breeds.About the mineral element contents,the differences were significant only in P,Mn and Se of some breeds in this experiment.[Conclusion]The results in this study could provide the reference for further researcher,layer producers,nutritionists,consumers and so on.
基金Supported by Modern Agricultural Industry Technology System Construction Special Fund(nycytx-41-2B)Social Development Project of Yangzhou(yz2010080)
文摘[Objective]In order to research on effect of different content of cottonseed meals on production performance and egg quality of Hisex laying hens. [Methods]120 Hisex laying hens of 37 weeks old are chosen,randomly divided into four groups and three repetitions are set in each group,there are 10 hens in each repetition. Group I is the control group,II,III and IV are experimental groups. Cottonseed meal contents are respectively 5%,10% and 15%,with test cycle of 10 weeks,effects of different cottonseed meal dosages on Hisex laying hens production performance and egg quality are observed. [Results]When the diet is added with 5% to 15% of cottonseed meal,the average laying rate,average egg weight and feed-gain ratio all show downward trends when compared with that of the control group,but with no significant difference( P > 0. 05); eggshell strength,eggshell thickness,Haugh unit,egg shape index all show no significant difference( P >0. 05),with the increasement of cottonseed meal,the color of egg yolk got brighter,egg yolk color of 15% added group increased by 12%,show a significant difference with that of control group( P <0. 05). [Conclusion]When the feed was added with 15% cottonseed meals,it has an unconspicuous effect on laying performance and egg quality of Hisex laying hens,but whether it had an effect on animal health and food safety or not,a further systematic research is needed.
基金supported by the Program of National Technological Basis from Ministry of Science and Technology of China(No.2005DKA21101)the National Natural Science Foundation of China(No.30700572)
文摘The Nei's improved genetic distance(DA)and gene flow(Nm)were measured using sixteen microsatellite markers.Dendograms based on DA genetic distance using the neighbor-joining(NJ)method and STRUCTURE program were constructed to analyze the genetic structure and relationship among 10 Chinese indigenous chicken breeds.The results showed that dendograms of DA genetic distance using the NJ method divided the 10 chicken breeds into two main clusters;one consisted of breeds of low weight body(CHA,TTB,XIA,GUS and BAI),the other contained heavier breeds(LAN,DAG,YOU,XIS and LUY).In the lighter breeds,TIB and CHA clustered together,as did XIA and GUS.In the heavier breeds,XIS and LUY was clustered together in one branch,but LAN,DAG and YOU clustered in independent branches.The results were consistent with Nm estimates among the 10 indigenous chicken breeds.The STRUCTURE program properly inferred the presence of genetic structure despite not pre-defining the origin of individuals.The genetic cluster inferred by STRUCTURE was basically the same as that from the DA distance clustering method.An advantage of the STRUCTURE program was its ability to identify the migrants and admixed individuals in the 10 chicken populations;this could not be achieved by use of the DA distance clustering method.
