Results 261 to 270 of about 613,182 (293)

Components of the genetic variance and genetic correlations between traits in Mango

Scientia Horticulturae, 1998
Phenotypic and genetic variance components for mango (Mangifera indica) traits were estimated. The analyzed population composed of 745 progeny derived from both controlled crosses and open pollination. The average percent of selfing was estimated from the statistical model to be 50%.
U Lavi, E Tomer, S Gazit, J Hillel
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Genetic Variance Components of Birth Weight in a Herd of Unselected Cattle

Journal of Animal Science, 1984
Two replicates of a randomly selected herd of Hereford cattle have been developed at the Livestock and Range Research Station in Miles City, Montana. Dams were first bred to a random selection of bulls in 1976. For this study, birth weights of 1,012 calves born in 1977 through 1983 were adjusted for sex, age of dam and year effects.
T C, Nelsen, R E, Short, J J, Urick, W L, Reynolds   +3 more
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Assessing genetic linkage and association with robust components of variance approaches

Annals of Human Genetics, 1996
SummarySimulation studies are used to explore the properties of procedures for estimating components of variance and constructing test statistics in genetic linkage studies of quantitative traits. We evaluated the bias and median squared error of estimates of the linked additive genetic variance obtained by regression, maximum likelihood and ...
C I, Amos, D K, Zhu, E, Boerwinkle
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Heifer Fertility in Norwegian Dairy Cattle: Variance Components and Genetic Change [PDF]

Journal of Dairy Science, 2003
Variance components and genetic change were estimated for 56-d nonreturn rate in virgin heifers using first insemination records of a total of 1,632,961 Norwegian Dairy Cattle daughters of 2945 sires. Six univariate mixed linear sire models were compared. The heritabilities varied from 1.2% to 1.4%.
Bjørg Heringstad
exaly   +3 more sources

Variance Components Analysis for Genetic Linkage of Time to Onset for Disease

Genetic Epidemiology, 2001
We compared two variance components methods for detecting genes that influence time to onset for a complex disease using simulated data. We first divided the extended families into nuclear families. The first method fitted variance components to the martingale residuals, which were obtained from first fitting a proportional hazards model to the time to
C I, Amos, S, Shete, X, Gu
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Components of genetic variance for plant survival and vigor of apple trees

Theoretical and Applied Genetics, 1970
The additive and non-additive variance components were estimated from progenies derived from two samples of parents (representing a northern continental type climate) for five factors relating to plant survival and two composites of the factors. It was found that additive variance made up 90 and 100%, 91 and 100%, 91 and 100%, 100 and 100%, 82 and 59%,
R, Watkins, L P, Spangelo
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Variance Components with Reference to Genetic Population Parameters

Biometrics, 1955
The inature of variability in a populationi observed at a giveni time wTith respect to a particular metric trait is of great interest and importance among animal and plant breeders. Their work depends heavily upon the ability to design breeding experiments and to take advantage of statistical techniques which will enable them successfully to apportion ...
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Genetic and environmental variance components in guava fruit qualities

Scientia Horticulturae, 2005
Abstract The proportion of genetic and environmental variances for fruit weight (FW), flesh thickness (FLT), flesh weight (FLW), fruit firmness (FF), seed cavity weight (SCW), total soluble solids (TSS), titratable acidity (TA), juice acidity (pH), and ascorbic acid (AA) in guava were estimated with eight genotypes, four trees per genotype, and five ...
K. Thaipong, U. Boonprakob
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Estimates of variance components for genetic correlations among swine estrus traits

Journal of Animal Science, 2010
Variance components and genetic correlations were estimated among estrus, puberty, growth, and composition traits in Landrace-Large White gilts (n = 1,225; Genetic Improvement Services, Newton Grove, NC) from 59 sires and 330 dams. Four groups of gilts entered the North Carolina Swine Evaluation Station in Clayton at an average age of 162 d and were ...
M T, Knauer, J P, Cassady, D W, Newcom, M T, See   +3 more
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Variance‐components tests for genetic association with multiple interval‐censored outcomes

Statistics in Medicine
Massive genetic compendiums such as the UK Biobank have become an invaluable resource for identifying genetic variants that are associated with complex diseases. Due to the difficulties of massive data collection, a common practice of these compendiums is to collect interval‐censored data. One challenge in analyzing such data is the lack of methodology
Jaihee Choi, Zhichao Xu, Ryan Sun
openaire   +3 more sources