Genome-wide Association Study of Teats Number Traits in Kele Pigs     

XIE Jian  YU Chang-yan  XU Yao  NIU Xi  RAN Xue-qin  WANG Jia-fu 《中国畜牧兽医》2016,43(11):2866-2872

Teats number is one of the most important reproductive traits,and closely related to the economic benefit in pig industry.In order to reveal the underlying genetics of left teats number,right teats number and total teats number traits,a genome-wide association study（GWAS）was performed.Samples of DNA were collected to genotyping for 22 Kele pigs using the Illumina Porcine SNP 60K Chip.The GWAS was performed using a mixed-effects model and linear regression approach.When a genome-wide threshold was determined using the Bonferroni method（P<2.06E-5),4 single nucleotide polymorphism（SNP）markers were potentially associated with left teats number,right teats number and total teat number.However,3 SNPs were significant associated and 18 SNPs were potentially associated in chromosomes level.304 Ensembl genes were retrieved around 1 cM of the associated SNPs.The candidate genes in Wnt and Fgf signaling pathway（BTRC,FGF5,FGF8,BMP3,RASGEF1B and HMGB3）might have effect on target traits.These results provided valuable information about the selective breeding for Kele pigs.  相似文献   

基于生态文明价值观的家庭林场发展研究     

张驰  杨帆  曾维忠 《中南林业科技大学学报(自然科学版)》2015,(2):130-134

家庭林场经营模式的优点,除了创新经营管理体制,解放农村生产力,调动广大林农的生产经营积极性,促进林农脱贫致富外,还在于该模式内涵丰富的生态文明价值理念,能够将生态文明价值观在代际间传递延续,指导生产实践,保护生态环境,实现永续发展,这对促进生态文明建设、构建美丽中国具有重大的现实作用和深远的影响意义。本研究在阐明家庭林场内涵丰富的生态文明价值理念的基础上,阐释了发展家庭林场的经济、社会和生态效益,并针对目前家庭林场发展存在的问题提出对策建议。  相似文献   

新型广谱杀虫药沙罗拉纳在国外伴侣动物体外寄生虫防治中的应用     

徐燕婷  杨光友 《中国动物检疫》2021,38(4):95-101

沙罗拉纳(sarolaner)属异恶唑啉类化合物,是一种新型广谱杀虫药。沙罗拉纳已被证实通过特异性阻断昆虫γ-氨基丁酸受体和谷氨酸门控氯离子通道而显示出抗寄生虫活性。本文综述了近年来沙罗拉纳在国外伴侣动物体外寄生虫防治中的开发及临床应用情况,旨在为该药的深入研究和国内开发应用提供参考。近年来,该药主要用于犬猫等伴侣动物体外寄生虫的临床预防和治疗,对蜱类、蚤类、螨类等体外寄生虫有高效的杀灭作用。与其他杀虫药相比,该药在分子结构、作用位点和选择性等方面有显著差异,具有杀虫活性强、治疗剂量低、安全性高等优点。此外,该药通过与多种药物联合应用,可提高治疗效果,扩大治疗范围。就国外研究来看,沙罗拉纳是一种安全广谱的高效杀虫剂,拥有广阔的应用前景。  相似文献   

湖南洋泉水库调度的最优气候决策方法探讨   总被引：1，自引：0，他引：1  

邹希云  刘电英  文强 《中国农业气象》2006,27(3):191-193

充分利用气候资源作好水库水位（量）调度、提高水库在抗旱和发电中的经济效益,是当今水库调度决策亟待解决的一个重要课题.本文根据气象经济学原理,运用连续函数求极值方法,利用洋泉水库有关经济参数,建立水库气候最优调度决策,在水库的实际调度中应用,可取得明显的社会经济效益.  相似文献   

覆膜防沙治沙方法     

詹敏  于忠峰  于明  李爽 《水土保持研究》2007,14(3):381-383

沙漠、沙尘暴和沙化问题已经成为威胁人类生存的头号敌人，如何根治沙漠、沙尘暴和沙化是摆在人类面前的十分紧迫的任务。覆膜防沙治沙方法的研究和提出，成功地解决了人类面临的重大防沙治沙难题。为人类征服自然，征服沙漠树立了信心。介绍了覆膜防沙治沙的技术方式、方法、原理和覆膜栽培技术，供防沙治沙工程参考和推广。  相似文献   

Alterations due to dilution and anticoagulant effects in hematologic analysis of rodent blood samples on the Sysmex XT‐2000iV          下载免费PDF全文

Kaitlin A. Moorhead  Marielle L. Discipulo  Jing Hu  Roberta C. Moorhead  Jennifer L. Johns 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2016,45(2):215-224

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An 8bp indel in exon 1 of Ghrelin gene associated with chicken growth   总被引：7，自引：0，他引：7  

Fang M  Nie Q  Luo C  Zhang D  Zhang X 《Domestic animal endocrinology》2007,32(3):216-225

Ghrelin, acts as the endogenous ligand for growth hormone secretagogues receptor (GHS-R), is a novel growth hormone (GH) releasing peptide with reported effects on food intake in chickens. In this study, an 8 bp indel polymorphism in exon 1 of the chicken Ghrelin (cGHRL) gene was genotyped in a F(2) designed full-sib population to analyze its associations with chicken growth and carcass traits. Later, mRNA level in the proventriculus was determined by real-time PCR to reveal the expression feature of cGHRL gene. Result showed that this 8 bp indel was significantly associated with body weight at the age of 28 days (BW28) and 56 days (BW56), eviscerated weight (EW) and leg muscle weight (LMW) (P<0.05), highly significantly associated with hatch weight (HW), BW14, 21, 35, 42, 49, 90 and body length (BL), dressed weight (DW), eviscerated weight with giblet (EWG), wing weight (WW), breast muscle weight (BMW) and head and neck weight (HNW) (P<0.01). Meanwhile, A allele (with 'CTAACCTG') was positive for chicken growth as individuals with AA genotype had the highest value of all traits. Analysis on cGhrelin mRNA level revealed that it differed significantly among individuals with three genotypes (P<0.05). Individuals with AB genotype had the highest mRNA level, whereas that of AA had the lowest one. It was concluded that this 8 bp indel of cGHRL gene was significantly associated with most body weight and body composition traits, and negative effect of endogenous Ghrelin on chicken growth were indicated by this study.  相似文献   

昆虫病原线虫生物防控草地贪夜蛾的室内及田间效果和影响因素     

刘奇志  蔡佳仪  张小涵 《植物保护学报》2023,50(1):50-58

联合国粮食及农业组织2018年向全球发布草地贪夜蛾Spodoptera frugiperda是重要的预警害虫。据报道,2019年我国已有26个省（区、市）的作物受到草地贪夜蛾为害。目前已经发现草地贪夜蛾幼虫对某些化学农药产生抗性的现象,为缓解其抗药性产生,具有主动寻找寄主害虫的昆虫病原线虫为草地贪夜蛾的生物防治提供了应用潜能。该文从昆虫病原线虫高效侵染种（品系）及其浓度、共生菌、草地贪夜蛾幼虫易感龄期、田间致死力及影响防控效果的因素等方面进行综述,以期为田间有效利用昆虫病原线虫防治草地贪夜蛾提供参考。  相似文献   

草类物料压缩试验研究中的突破性进展   总被引：2，自引：1，他引：2  

杨明韶  毕玉革 《农机化研究》2005,2(1):1-5

在国内外草物料压缩试验研究的基础上,对新鲜草物料压缩流变进行试验研究,总结出了草物料压缩试验研究过程中几个带有突破性的进展,较系统地展示了草物料压缩研究逐步深入的历程和规律,对草物料压缩基础研究的发展有重要意义。在国外研究“闭式压缩”很长时间后,我国开始了“开式压缩”试验研究。从实验室的局部过程的试验研究,发展到压缩工程全过程的试验研究;从一般工程力学的研究,推进入到压缩过程流变学试验研究;从理论上的阶跃历程的流变学试验研究,跨越到工程上任意历程的流变学试验研究,将草物料压缩流变研究推向新阶段。最后又提出了变断面积的压缩流变试验研究,继续推进草物料压缩工程和草物料加工流变学发展。  相似文献   

Region Study on Sciences of Human Settlements in China     

Yang YuZhe 《保鲜与加工》2005,(3):5

By review of region study in recent development of history science, geography and Sciences of Human Settlements, this paper points out that material collecting without interrelated analyzing as well as focusing on main question and assumption without enough argumentation are main problems in this field now. The method renovation & combination with related subjects are discussed, this paper concludes that strengthen interdisciplinary study with Geography is a key issue in the future development of region study in Sciences of Human Settlements and possible approach to "technical development' and "humanity concern'.  相似文献