BLUP法在种兔选择上的应用   总被引：1，自引：0，他引：1  

唐辉  徐敏存 《中国养兔杂志》1999,(2):20-22

采用最佳线性无偏预测（ＢＬＵＰ）技术，配合公畜模型，对种兔的育种值进行了估测，同时也估测了长毛兔主要经济性状的遗传力及性状间的表型相关和遗传相关。结果表明，以体重的遗传力为最大（０．４４５），其次为胸围（０．４１１），繁殖性状的遗传力较小，产仔数和泌乳力的遗传力分别为０．１３１和０．１２１；体重、体长、胸围与剪毛量的遗传相关较大，分别为０．４１７、０．２９５和０．３５５，而与粗毛率的遗传相关较小，分别为０．１１５、０．０５１和０．２１４。  相似文献   

品种区域试验中算术平均值、 BLUP和AMMI估值的精度比较   总被引：3，自引：0，他引：3  

张群远  孔繁玲  杨付新 《作物学报》2001,27(4):428-433

利用1982年以来我国棉花、小麦、水稻和玉米的60套区域试验数据,采用交叉验证方法,对区域试验中算术平均值、最佳线性无偏预测值(best linear unbiased predictor,BLUP)和AMMI(additive main effects and multiplicative interaction)模型估值的预测精度进行比较,结果表明,与算术平均值相比,AMMI估值精度的增益倍数(gain  相似文献   

Dealing with sources of variability in the data-analysis of phenotyping experiments with transgenic rice     

Joris De Wolf  Luc Duchateau  Eddie Schrevens 《Euphytica》2008,160(3):325-337

  相似文献   

作物品种区域试验中品种均值估计的模型和方法——算术平均值、加权最小二乘估值和BLUP的比较   总被引：4，自引：1，他引：3  

张群远  孔繁玲  杨付新 《作物学报》2003,29(6):884-891

针对作物区域试验中的品种均值估计问题,根据混合线性模型的一般原理,总结和提出多种加权最小二乘估计 (WLSE)和最佳线性无偏预测(BLUP)的方法,推导了这些方法的平衡数据计算简式;同时,利用14套2年多点的棉花区试资料和一套4年多点的棉花品种试验对这些方法的预测效果进行验证比较.结果表明,与算术平均值相比,以环境内误差方  相似文献   

尾叶桉家系遗传力评估和选择研究     

陈文平 《广东林业科技》2008,24(6):41-45

运用BLUP模型对不同林龄尾叶桉家系进行家系和个体遗传值评估,同时进行了主成分分析。结果表明：不同林龄尾叶桉自由授粉家系在树高、胸径、单株材积上存在显著的差异。不同林龄家系遗传力存在着差异,其中家系遗传力大于单株遗传力。随着林龄的增大,树高、胸径和材积在家系遗传力和单株遗传力上均呈现先缓慢增大、后逐步变小的趋势。早晚性状之间存在显著相关性。尾叶桉家系选择可从第3年开始。根据主成分分析获得综合性状权重,利用秩次排名得分,选出优良家系。  相似文献   

Investigation of long-term field experiments on response of breeding lines to common scab in a potato breeding program     

G. C. C. Tai  A. M. Murphy  Xingyao Xiong 《Euphytica》2009,167(1):69-76

Common scab, caused by Streptomyces scabies, is a disease that produces scab-like surface lesions on potato tubers. Testing for susceptibility/resistance of breeding lines at the Potato Research Centre of Agriculture & Agri-Food Canada (AFC) is carried out in a scab nursery maintained at AFC for the annual scab evaluation field trials. A replicated field trial routinely consists of breeding lines from previous testing season(s) plus newly selected lines. Data of scab scores generated from long-term experiments thus formulate an incomplete 2-way table over combinations of breeding lines (genotypes) and trials (years). This requires an advanced statistical method to estimate genetic parameters for evaluation purposes. A data base with 1,435 scab index scores from 344 breeding lines were extracted from 5 years (1995–1999) of field experiments in the scab nursery maintained at AFC. The statistical method Residual Maximum Likelihood (REML) was employed to estimate variance components of the breeding population and Best Linear Unbiased Predictor (BLUP) was used to predict genetic merit of breeding lines. High heritability was obtained from variance components estimated by REML. The BLUP scores of breeding lines provided reliable evaluation of their responses to common scab. Two data base sub-sets were separately formulated from the original data base for those parents and grandparents of the breeding lines having pedigree records available. They were again subjected to REML and BLUP analyses to compare the responses to common scab and identify sources of resistance at the parental and grandparental levels. Two random data sets with equal sized samples of breeding lines were also generated from the over-all data base. The two sets of BLUP scores between corresponding breeding lines and parents showed high association which provides an assessment of the validity of the evaluation process.  相似文献   

动物模型在荷斯坦牛遗传评定上的应用   总被引：1，自引：0，他引：1  

唐臻钦  洪广田 《畜牧兽医学报》1997,28(3):199-205

本研究应用动物模型ＢＬＵＰ法在微机上评定了北京地区１９６５￣１９９２年间出生的荷斯坦牛４１０８０头，建立了一套荷斯坦牛的动物模型评定系统。迭代求解采用间接解法，在阅读数据文件时进行。对于管理组、公牛与牛场互作、永久环境效应，采用Ｇａｕｓｓ－Ｓｅｉｄｅｌ迭代法，对于动物个体和遗传组效应，采用不完全的Ｊａｃｏｂｉ迭代法。提供预期传递力、父母传递力均数、预期生产力、表型均值等有用的遗传和生产信息。在配备  相似文献   

用BLUP法估计公猪繁殖性状育种值   总被引：7，自引：1，他引：7  

谢庄  潘锦清 《南京农业大学学报》1989,12(4):88-93

用BLUP法对36头二花脸公猪、19头姜曲海公猪的女儿1～4胎的繁殖性状进行了育种值估测;并用秩相关法比较了最小二乘、带与不带亲缘相关矩阵的BLUP三种方法的估测效果。结果表明,最小二乘分析法的估测最不理想,与二种BLUP法的秩相关系数都很低(从0.230～0.726),带亲缘相关阵的BLUP法由于所含信息量最多,因而估测效果最可靠;对二个猪种的公猪育种值名次进行了系谱跟踪,父子间相关在二个猪种间有着较大的差异:2、4胎产仔存活性状姜曲海猪呈父子负相关(-0.224～0.491),而二花脸猪则为中或强的正相关(0.431～0.683)。  相似文献   

Selection of core animals in the Algorithm for Proven and Young using a simulation model          下载免费PDF全文

H.L. Bradford  I. Pocrnić  B.O. Fragomeni  D.A.L. Lourenco  I. Misztal 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2017,134(6):545-552

The Algorithm for Proven and Young (APY) enables the implementation of single‐step genomic BLUP (ssGBLUP) in large, genotyped populations by separating genotyped animals into core and non‐core subsets and creating a computationally efficient inverse for the genomic relationship matrix ( G ). As APY became the choice for large‐scale genomic evaluations in BLUP‐based methods, a common question is how to choose the animals in the core subset. We compared several core definitions to answer this question. Simulations comprised a moderately heritable trait for 95,010 animals and 50,000 genotypes for animals across five generations. Genotypes consisted of 25,500 SNP distributed across 15 chromosomes. Genotyping errors and missing pedigree were also mimicked. Core animals were defined based on individual generations, equal representation across generations, and at random. For a sufficiently large core size, core definitions had the same accuracies and biases, even if the core animals had imperfect genotypes. When genotyped animals had unknown parents, accuracy and bias were significantly better (p ≤ .05) for random and across generation core definitions.  相似文献