Association mapping reveals loci associated with multiple traits that affect grain yield and adaptation in soft winter wheat     

Dennis N. Lozada  R. Esten Mason  Md Ali Babar  Brett F. Carver  Gina-Brown Guedira  Keith Merrill  Maria Nelly Arguello  Andrea Acuna  Lucas Vieira  Amanda Holder  Christopher Addison  David E. Moon  Randal G. Miller  Susanne Dreisigacker 《Euphytica》2017,213(9):222

Genome-wide association studies (GWAS) are useful to facilitate crop improvement via enhanced knowledge of marker-trait associations (MTA). A GWAS for grain yield (GY), yield components, and agronomic traits was conducted using a diverse panel of 239 soft red winter wheat (Triticum aestivum) genotypes evaluated across two growing seasons and eight site-years. Analysis of variance showed significant environment, genotype, and genotype-by-environment effects for GY and yield components. Narrow sense heritability of GY (h ²  = 0.48) was moderate compared to other traits including plant height (h ²  = 0.81) and kernel weight (h ²  = 0.77). There were 112 significant MTA (p < 0.0005) detected for eight measured traits using compressed mixed linear models and 5715 single nucleotide polymorphism markers. MTA for GY and agronomic traits coincided with previously reported QTL for winter and spring wheat. Highly significant MTA for GY showed an overall negative allelic effect for the minor allele, indicating selection against these alleles by breeders. Markers associated with multiple traits observed on chromosomes 1A, 2D, 3B, and 4B with positive minor effects serve as potential targets for marker assisted breeding to select for improvement of GY and related traits. Following marker validation, these multi-trait loci have the potential to be utilized for MAS to improve GY and adaptation of soft red winter wheat.  相似文献   

Variability in the composition of lupin (Lupinus angustifolius) meals influences their digestible nutrient and energy value when fed to rainbow trout (Oncorhynchus mykiss)     

Brett Glencross  Wayne Hawkins  David Evans  Neil Rutherford  Peter McCafferty  Ken Dods  Max Karopoulos  Chris Veitch  Sofie Sipsas  Bevan Buirchell   《Aquaculture (Amsterdam, Netherlands)》2008,277(3-4):220-230

Over a series of seven separate experiments 76 different lupin (Lupinus angustifolius) meals were assessed for their digestible dry matter, protein, amino acid and energy characteristics when fed to rainbow trout. Two reference diets (a common basal diet and a reference lupin meal) were also included in each experiment. Minimal variance in the digestibility parameters of both reference diets was observed among the experiments ensuring that there was a high degree of robustness in the across-experiment evaluations. Using simple and multiple-regression techniques, principal diet and ingredient composition factors affecting diet and ingredient digestibilities and ingredient digestible values were explored within the dataset. Using simple linear regression, it was shown that nitrogen digestibility of the lupin meals was negatively influenced by ingredient lignin content, but positively affected ingredient protein (N × 6.25) content. The energy digestibility of the lupin meals was positively affected by a range of compositional features including protein, sum of amino acids and negatively affected by carbohydrate content. The digestible nutrient and energy content of the meals reflected the combined effects of both ingredient digestibilities and ingredient composition. The digestible nitrogen content of the lupin meals was positively affected by protein (N × 6.25), sum of amino acids and energy content, but was negatively affected by lignin and carbohydrate content. The digestible sum of amino acids was also positively affected by protein, sum of amino acids, but only negatively affected by carbohydrate content, not lignin content. The digestible energy content of the lupin meals was also positively affected by protein, sum of amino acids and their own energy density, but only negatively affected by carbohydrate content. Multiple linear regression modelling supported that together ingredient protein and lignin content were the strongest predictors of digestible protein value, explaining close to 60% of the variability in this parameter. Discrete reassessment of these relationships using non-linear analysis methods provided a stronger interpretation of the ingredient composition effects. In recognition of this, a functional model including terms for ingredient protein and lignin content on the digestible protein value was defined. This study demonstrates that within one raw material type that not only does significant variability in the digestible value of the raw materials exist, but that it is possible to identify compositional features of that raw material that are intrinsically influencing their own digestible value.  相似文献   

A SNP map of the rat genome generated from cDNA sequences   总被引：1，自引：0，他引：1  

Zimdahl H  Nyakatura G  Brandt P  Schulz H  Hummel O  Fartmann B  Brett D  Droege M  Monti J  Lee YA  Sun Y  Zhao S  Winter EE  Ponting CP  Chen Y  Kasprzyk A  Birney E  Ganten D  Hubner N 《Science (New York, N.Y.)》2004,303(5659):807

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A Parametric Transfer Function for Grain-Flow Within a Conventional Combine Harvester     

Whelan  Brett M.  McBratney  Alex. B. 《Precision Agriculture》2002,3(2):123-134

Grain yield monitoring is an integral tool in the Precision Agriculture management system. When used in conjunction with a satellite-based navigation system, it provides spatial information on output variability, output response to managed inputs and is used to identify limiting resources in the crop production process. Accurately matching measured yield quantities with spatial units within a field is therefore important. At present, a simple linear time shift is employed by all commercial monitoring systems to account for the delay between GPS recorded positions and subsequent yield measurements. This study examines the internal process of grain transport to the sensor by monitoring the flow of strategically coloured grain. The flow is shown to be significantly influenced by mixing induced by threshing and auger transport processes. In contrast to the common assumption that grain moves as a spatially related cohort through to the sensor, the results suggest that a diffusion process is more realistic. A parametric model for the diffusion process is provided which suggests that from each individual yield measurement a maximum 20% of the mass could be assigned to a single spatial unit of the size that is typically allocated. The results imply that for further analyses, the inconclusive spatial origin and artificially smoothed quantities of instantaneous yield measurements should be considered.  相似文献   

Carbon dioxide laser treatment of extensive pigmented viral plaque lesions in a golden retriever dog          下载免费PDF全文

Evie C. Knight  John S. Munday  Brett M. Stone  Michael A. Shipstone 《Veterinary dermatology》2016,27(5):442-e117

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The use of traits to interpret responses to large scale - edge effects: a study of epigaeic beetle assemblages across a <Emphasis Type="Italic">Eucalyptus</Emphasis> forest and pine plantation edge     

Maldwyn John Evans  Sam C. Banks  Kendi F. Davies  Jeff Mcclenahan  Brett Melbourne  Don A. Driscoll 《Landscape Ecology》2016,31(8):1815-1831

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Clinical outcomes after colopexy through left ventral paramedian incision in 156 thoroughbred broodmares with large colon disorders (1999‐2015)          下载免费PDF全文

Alecsya H. Broyles DVM  Scott A. Hopper DVM  MS  Diplomate ACVS  J. Brett Woodie DVM  MS  Diplomate ACVS  Alan J. Ruggles DVM  Diplomate ACVS 《Veterinary surgery : VS》2018,47(4):490-498

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Clinical use of plasma lactate concentration. Part 2: Prognostic and diagnostic utility and the clinical management of hyperlactatemia          下载免费PDF全文

Patricia G. Rosenstein DVM  Brett S. Tennent‐Brown BVSc  DACVIM  DACVECC  Dez Hughes BVSc  DACVECC 《Journal of Veterinary Emergency and Critical Care》2018,28(2):106-121

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Feed Containing Novacq Improves Resilience of Black Tiger Shrimp,Penaeus Monodon,to Gill‐associated Virus‐induced Mortality          下载免费PDF全文

Melony J. Sellars  Min Rao  Nick Polymeris  Simon J. Irvin  Jeff A. Cowley  Nigel P. Preston  Brett D. Glencross 《Journal of the World Aquaculture Society》2015,46(3):328-336

The ability of Novacq to improve resilience of black tiger shrimp, Penaeus monodon, to infection and mortality induced by gill‐associated virus (GAV) was investigated. Over a 26‐d period, shrimp were fed pellets with or without 10% Novacq. Following this, four replicate tanks, each containing 10 shrimp that had been fed either diet, were maintained as‐is, injected with saline or injected with GAV inoculum (i.e., 40 shrimp for each of the six groups). For shrimp (n = 20) in two of each group of four tanks, survival was monitored daily over 14 d and a pleopod was sampled from each shrimp on Days 0 and 14. For the other two tanks, a pleopod was sampled from each shrimp on Days 0, 3, 7, 10, and 14 to track changes in GAV loads over time. Survival was significantly higher (P < 0.05) from Day 7 onward among the group fed Novacq. GAV infection loads appeared to vary more between individuals in the Novacq diet cohort, but overall were not reduced significantly at any time points post‐challenge compared to shrimp tested from the Control diet cohort.  相似文献   

Use of viscoelastic coagulation testing to monitor low molecular weight heparin administration to healthy horses     

Brett S. Tennent‐Brown BVSc  MS  DACVIM  DACVECC  Kira L. Epstein DVM  DACVS  DACVECC  Dorothy D. Whelchel DVM  MS  Steeve Giguère DVM  PhD  DAVCIM 《Journal of Veterinary Emergency and Critical Care》2013,23(3):291-299

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