scholarly journals Genetic variation of wood and resin production in Pinus caribaea var. hondurensis Barret & Golfari

2016 ◽  
Vol 65 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Wanderley dos Santos ◽  
Danilla Cristina Lemos Souza ◽  
Mário Luiz Teixeira de Moraes ◽  
Ananda Virginia de Aguiar
Keyword(s):  
Growth Traits ◽  
Genetic Parameter ◽  
Phenotypic Correlation ◽  
Parameter Estimates ◽  
Pinus Caribaea ◽  
Narrow Sense Heritability ◽  
Phenotypic Differences ◽  
Selection Strategies ◽  
Expected Gain ◽  
The Individual

Abstract The purpose of this work was to estimate genetic parameters and selection gain of Pinus caribaea var. hondurensis progeny trial for wood and resin production as well as correlation between them. Experiment was established in complete lattice square 10 × 10 (triple), 100 treatments, 10 plants per plot, 3 m × 3 m spacing. Twelve years after planting the trial had thinned considerably leaving six plants per plot. Twenty-seven years after planting height, diameter at breast height (dbh) and resin production were measured. Deviance analysis, genetic parameter estimates, selection expected gain, genetic and phenotypic correlation were based on REML/BLUP method. Significant phenotypic differences were observed among and within families for all traits. The thinning at 12 years after planting, contributed positively to dbh increase and resin production, with an average of 30.60 cm and 4.83 kg tree−1year−1. The individual narrow sense heritability ranged from 0.25 to 0.38 for dbh and volume. Genetic and phenotypic correlation between growth traits were positive, and significant. Therefore, different selection strategies will be proposed separately for both traits (resin and wood). The selection gains were significant, especially with 10 % selection intensity (individual selection) for dbh (7.53 %) and resin (13.49 %). The trial has had good performance for growth, resin and genetic variability to support the next breeding generation

scholarly journals Growth differences and genetic parameter estimates of 15 teak (Tectona grandis L.f.) genotypes of various ages clonally propagated by microcuttings and planted under humid tropical conditions

2013 ◽  
Vol 62 (1-6) ◽  
pp. 196-206 ◽  
Author(s):  
D. K. S. Goh ◽  
Y. Japarudin ◽  
A. Alwi ◽  
M. Lapammu ◽  
A. Flori ◽  
...  
Keyword(s):  
Growth Traits ◽  
Genetic Parameter ◽  
Tectona Grandis ◽  
Annual Rainfall ◽  
Phenotypic Correlation ◽  
Parameter Estimates ◽  
Age Related ◽  
Tropical Conditions ◽  
Growth Differences ◽  
Clonal Test

Abstract Fifteen clones of teak (Tectona grandis) produced by micropropagation from 0.5 to more than 60 yr-old selected ortets were established in a clonal test in Sabah (East Malaysia) under 2500 mm of annual rainfall to compare their growth performances during the first 7 years of development. Field establishment was good with average mortality less than 10%. The clones developed rapidly true-to-type with significant between-clone differences in growth. Ranges of clone means were 13.6 to 19.3 m in height, 16.3 to 23.4 cm in diameter at breast height (DBH) and 129 to 264 dm3 in volume. Broad sense heritability estimates for these growth traits were lower overall for single trees (H2i) than for clone means (H2c) (H2i ≤ 0.257 vs H2c ≤ 0.634 for height, H2i ≤ 0.120 vs H2c ≤ 0.383 for DBH and H2i ≤ 0.125 vs H2c ≤ 0.364 for volume). The highest genetic gain that could be expected from the best three clones out of the fifteen compared was at age 2 for height (+0.66 m, or +11.7%), and age 3 for DBH (+0.87cm, or +10.4%) and volume (+4.65 dm3, or +15.7%). Age-related phenotypic correlation values were reliably (P < 0.0001) higher and more consistent for DBH (rP ≥ 0.61) than for height (0.37 ≤ rP ≤ 0.69), or than between DBH and height, except for height at 3 (0.51 ≤ rP ≤ 0.63) and 6 (0.55 ≤ rP ≤ 0.69) years. Height and DBH were moderately to highly genetically correlated (0.54 ≤ rG ≤ 0.90).

scholarly journals Genetic analysis for sooty mold resistance and heart of palm yield in Archontophoenix

2004 ◽  
Vol 61 (2) ◽  
pp. 178-184 ◽  
Author(s):  
Marilene Leão Alves Bovi ◽  
Marcos Deon Vilela de Resende ◽  
Luís Alberto Sáes ◽  
Roberta Pierry Uzzo
Keyword(s):  
Plant Height ◽  
Growth Traits ◽  
Phenotypic Correlation ◽  
Narrow Sense Heritability ◽  
Aphid Infestation ◽  
Visual Rating ◽  
Sooty Mold ◽  
Selection Strategies ◽  
Rating Method ◽  
Mold Resistance

Archontophoenix palms, utilized both as ornamental species and as a source of high-quality heart of palm, are susceptible to sooty mold, a disease coupled with aphid infestation, which affects photosynthesis and causes unpleasant, darkish palm appearance. Scoring rates for sooty mold resistance and three growth traits were assessed under field conditions in 24 open-pollinated half-sibs families, 28 months after planting, aiming to identify genetic variability for sooty mold resistance; estimate genetic parameters for this trait and plant height, diameter and number of leaves; estimate genetic and phenotypic correlation for the four traits and evaluate selection methods for heart of palm production through multi-trait index selection based on growth traits. There were genetic differences among families for all traits. The low coefficient of variation for sooty mold (9.48%) indicates that the visual rating method adopted was effective and feasible for comparing aphid plus sooty mold infestation levels in Archontophoenix. Narrow sense heritability estimates were low and medium for growth traits (0.10, 0.26 and 0.26 for leaves number, plant diameter and height, respectively) and very high (0.91) for sooty mold resistance. Genetic correlation was found between sooty mold resistance and plant height. This positive relationship indicates that culling of very susceptible palms can be done possibily without interference in the follow up indirect selection for heart of palm yield. Some selection strategies were presented, showing that possible genetic gain could range from 6.23 to 11.83%, depending on the selection method adopted and on the effective restriction of the population size.

scholarly journals STRAIN DIFFERENCES IN THE GENETIC PARAMETER ESTIMATES FOR GROWTH TRAITS IN MEAT-TYPE CHICKEN

2021 ◽  
Vol 23 (2) ◽  
pp. 103-106
Author(s):  
C. O. N. IKEOBI ◽  
S. O. PETERS
Keyword(s):  
Growth Traits ◽  
Genetic Parameter ◽  
Average Daily Gain ◽  
Genetic Correlations ◽  
Correlation Coefficients ◽  
Strain Differences ◽  
Phenotypic Correlation ◽  
Parameter Estimates ◽  
Feed Conversion ◽  
Meat Type

Data on live performance traits obtained from experiments involving two strains of meat-type chicken were analysed and used to estimate heritabilities of the traits and the -inter-character correlations. There were strain differences (P<0.05) for body weight of birds to 56 days of age, average daily gain, and daily feed intake per bird. Strain differences were not significant (P>0.05) for feed conversion ratio. Genetic correlations obtained between pairs of characters were generally high (P<0.01). Coefficients of phenotypic correlation were slightly lower relative to those of the genetic correlation. Environmental correlation coefficients were moderate to high (0.36 to 0.99) and also significant (P<0.01) within strains. Correlation of feed conversion rate with other characters wert negative for the two strains, Heritability estimates for the growth traits wa very high, and no appreciable differences were observed between the strains.

scholarly journals Realized Sampling Variances of Estimates of Genetic Parameters and the Difference Between Genetic and Phenotypic Correlations

Genetics ◽  
1996 ◽  
Vol 143 (3) ◽  
pp. 1409-1416 ◽  
Author(s):  
Kenneth R Koots ◽  
John P Gibson
Keyword(s):  
Genetic Correlation ◽  
Genetic Parameters ◽  
Genetic Parameter ◽  
Genetic Correlations ◽  
Phenotypic Correlation ◽  
Parameter Estimates ◽  
Sampling Variance ◽  
Phenotypic Correlations ◽  
Genetic And Phenotypic Correlations ◽  
Heritability Estimates

Abstract A data set of 1572 heritability estimates and 1015 pairs of genetic and phenotypic correlation estimates, constructed from a survey of published beef cattle genetic parameter estimates, provided a rare opportunity to study realized sampling variances of genetic parameter estimates. The distribution of both heritability estimates and genetic correlation estimates, when plotted against estimated accuracy, was consistent with random error variance being some three times the sampling variance predicted from standard formulae. This result was consistent with the observation that the variance of estimates of heritabilities and genetic correlations between populations were about four times the predicted sampling variance, suggesting few real differences in genetic parameters between populations. Except where there was a strong biological or statistical expectation of a difference, there was little evidence for differences between genetic and phenotypic correlations for most trait combinations or for differences in genetic correlations between populations. These results suggest that, even for controlled populations, estimating genetic parameters specific to a given population is less useful than commonly believed. A serendipitous discovery was that, in the standard formula for theoretical standard error of a genetic correlation estimate, the heritabilities refer to the estimated values and not, as seems generally assumed, the true population values.

scholarly journals Genetic aspects of growth and maturing rate in trypanotolerant beef cattle: N'Dama

2021 ◽  
Vol 30 (2) ◽  
pp. 149-156
Author(s):  
O. O Mgbere ◽  
O. Olutogun
Keyword(s):  
Growth Rate ◽  
Beef Cattle ◽  
Growth Traits ◽  
Physiological Stress ◽  
Genetic Parameter ◽  
High Standard ◽  
Parameter Estimates ◽  
Production Environment ◽  
Genetic Progress ◽  
Animal Management

Genetic parameters for Absolute Growth Rate (AGR), Relative Growth Rate (RGR) and Absolute Maturing Rate (AMR) at various age interval from birth to maturity in N 'Dama beef cattle raised in the humid Tropics of Nigeria were estimated. Performance data used were accumulated between 1948 and 1964 at Fasola cattle ranch in Oyo, Nigeria and the number of records analysed ranged from 44 to 678. prewering (B - W) growth and maturing rates in N’Dama calves were 0.377 ± 0.009 kg/day (AGR), 0.643 ± 0.006 %/day (RGR) and 0.120 ± 0.003% A/day (AMR) and fluctuated subsequently, following the animals' state of development and certain physiological stress conditions.  At post weaning (W-12), these rates decreased to 0.249 ± 0.049 kg/day, 0.204 ± 0.029 %/day and 0.075 ± 0.014 % A/day for AGR, RGR and AMR respectively. Estimates of heritability at the various age intervals were considered low in these growth traits with values obtained ranging from 0.03 to 0.24 for AGR, 0.03 to 0.21 for RGR and 0.02 to 0.42 for AMR, with high standard errors. The low estimates though, consistent with literature reports were attributed to the poor standard of animal management and production environment at Fasola. It was evident from this study that selection of N'Dama calves based on post weaning (W-12) growth or maturing rates would yield substantial genetic progress. However, improved animal management and production environment on the ranch would not only improve precision of the genetic parameter estimates but would also enhance N 'Dama growth performance generally.

scholarly journals Variability in flooding tolerance, growth and leaf traits in a Populus deltoides intraspecific progeny

2019 ◽  
Vol 40 (1) ◽  
pp. 19-29 ◽  
Author(s):  
María E Rodríguez ◽  
Diana Lauff ◽  
Silvia Cortizo ◽  
Virginia M C Luquez
Keyword(s):  
Stomatal Conductance ◽  
Populus Deltoides ◽  
Growth Traits ◽  
Leaf Size ◽  
Field Capacity ◽  
Leaf Traits ◽  
Phenotypic Correlation ◽  
Flooding Tolerance ◽  
Initial Growth ◽  
Narrow Sense Heritability

Abstract Climate change will increase the risk of flooding in several areas of the world where Populus deltoides Marshall (eastern cottonwood) is planted, so it would be desirable for this species to select for flooding tolerance. The aims of this work were to explore the variability in growth, leaf traits and flooding tolerance in an F1 full-sib intraspecific progeny of P. deltoides, to analyze the correlations of leaf and growth traits with flooding tolerance and to assess their suitability for use in breeding programs. Two-month-old parental clones and their progeny of 30 full-sib F1 genotypes were grown in pots and subjected to two treatments: (i) plants watered to field capacity (control) and (ii) plants flooded up to 10 cm above soil level for 35 days. Growth (height, diameter and biomass partition) and leaf traits (leaf size and number, specific leaf area, leaf senescence, abscission, stomatal conductance, carbon isotope discrimination, stomatal index) were measured. Flooding tolerance for each genotype was estimated as the ratio of the biomass of stressed plants to the biomass of control plants. Results showed segregation in terms of flooding tolerance in the F1 progeny. A significant genotype effect was found for leaf size and number, carbon isotopic discrimination and stomatal conductance, but it did not correlate with flooding tolerance. Height, diameter and root-to-shoot ratio had a positive phenotypic correlation with flooding tolerance, and there was a positive genetic correlation of height and diameter with biomass on both treatments. The narrow sense heritability values for the traits analyzed ranged from 0 to 0.56. We conclude that growth traits are more adequate than leaf traits for selection to increase flooding tolerance. A vigorous initial growth would increase flooding tolerance in young poplar plants.

Genetic parameter estimates for early growth traits in Naeini goat

2012 ◽  
Vol 52 (11) ◽  
pp. 1046 ◽  
Author(s):  
Hasan Baneh ◽  
Mojtaba Najafi ◽  
Ghodrat Rahimi
Keyword(s):  
Environmental Effects ◽  
Variance Components ◽  
Genetic Parameters ◽  
Growth Traits ◽  
Genetic Parameter ◽  
Average Daily Gain ◽  
Parameter Estimates ◽  
Estimate Variance ◽  
Daily Gain ◽  
Birth Type

The present study was carried out to estimate variance components for growth traits in Naeini goats. Bodyweight records were collected for two flocks under supervision of the Agriculture Organisation of the Esfahan province between 2000 and 2007. Investigated traits were birthweight (BW; n = 2483), weaning weight (WW; n = 1211) and average daily gain from birth to weaning (ADG; n = 1211). Environmental effects were investigated using fixed-effect models, while (co)variance components and genetic parameters were estimated with single- and three-trait analyses using REML methods and WOMBAT software. Six different animal models were fitted to the traits, with the best model for each trait determined by log-likelihood ratio tests (LRT). All traits were significantly influenced by herd, birth year, sex of the kid, birth type and dam age (P < 0.01). On the basis of LRT, maternal permanent environmental effects (c2) were significant for WW and ADG, while BW was affected only by direct genetic effects. Direct heritability estimates for BW, WW and ADG were 0.25 ± 0.05, 0.07 ± 0.06 and 0.21 ± 0.11, respectively. The estimate of c2 was 0.16 ± 0.06 for both WW and ADG. Estimates of genetic correlation for BW–ADG, BW–WW and ADG–WW were 0.49, 0.61 and 0.94, respectively. The estimated phenotypic correlations were positive and were between 0.03 (BW–ADG) and 0.95 (ADG–WW). These results indicate that selection can be used to improve growth traits in this goat breed.

Natural variation and genetic parameters in Fraser fir for growth and Christmas tree traits

1994 ◽  
Vol 24 (7) ◽  
pp. 1480-1486 ◽  
Author(s):  
R.J. Arnold ◽  
J.B. Jett ◽  
S.E. McKeand
Keyword(s):  
Growth Traits ◽  
Genetic Parameter ◽  
Genetic Correlations ◽  
Christmas Tree ◽  
Parameter Estimates ◽  
Early Age ◽  
Individual Tree ◽  
Fraser Fir ◽  
Seed Sources ◽  
Height Class

Open-pollinated progeny trials of Fraser fir (Abiesfraseri (Pursh) Poir.) assessed at 8 years provided genetic parameter estimates for growth, Christmas tree quality traits, and wholesale value at harvest age. Significant variation was found between and within nine different seed sources. Estimated individual tree heritabilities of important traits ranged from a low of 0.13 for USDA Christmas tree grade to a moderate value of 0.33 for crown diameter. Heritabilities within the better performing seed sources tended to be higher. Of the two traits that determine wholesale value, USDA grade and height class, the latter proved to have the greater influence, both phenotypically and genetically. Genetic correlations of early age height growth with 8-year total height, height class, USDA Christmas tree grade, and individual tree wholesale value proved favorable and strong (range of 0.57–0.96). In combination with moderate heritabilities for early growth traits, such correlations provide potential for effective early age selections in Fraser fir Christmas trees.

scholarly journals Coheritability and Coenvironmentability as Concepts for Partitioning the Phenotypic Correlation

2019 ◽  
Author(s):  
Jorge Vasquez-Kool
Keyword(s):  
Genetic Parameter ◽  
Three Dimensional ◽  
Large Data ◽  
Phenotypic Correlation ◽  
Shared Environment ◽  
Parameter Estimates ◽  
Extensive Literature ◽  
Data Set ◽  
Phenotypic Characters ◽  
Relative Contribution

AbstractCentral to the study of joint inheritance of quantitative traits is the determination of the degree of association between two phenotypic characters, and to quantify the relative contribution of shared genetic and environmental components influencing such relationship. One way to approach this problem builds on classical quantitative genetics theory, where the phenotypic correlation between two traits is modelled as the sum of a genetic component called the coheritability (hx,y), which reflects the degree of shared genetics influencing the phenotypic correlation, and an environmental component, namely the coenvironmentability (ex,y) that accounts for all other factors that exert influence on the observed trait-trait association. Here a mathematical and statistical framework is presented on the partition of the phenotypic correlation into these components. I describe visualization tools to analyze and ex,y concurrently, in the form of a three-dimensional (3DHER-plane) and a two-dimensional (2DHER-field) plots. A large data set of genetic parameter estimates (heritabilities, genetic and phenotypic correlations) was compiled from an extensive literature review, from which coheritability and coenvironmentability were derived, with the object to observe patterns of distribution, and tendency. Illustrative examples from a diverse set of published studies show the value of applying this partition to generate hypotheses proposing the differential contribution of shared genetics and shared environment to an observed phenotypic relationship between traits.

Genetic Parameter Estimates for Preweaning Growth Traits in Santa Gertrudis Cattle

1987 ◽  
Vol 65 (6) ◽  
pp. 1495-1499 ◽  
Author(s):  
D. K. Aaron ◽  
F. A. Thrift ◽  
N. R. Parish
Keyword(s):  
Growth Traits ◽  
Genetic Parameter ◽  
Parameter Estimates
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