Probability of Inadmissible Estimates of Heritability from Regression and Half‐sib Analyses

Prabhakaran, V. T.; Jain, J. P.

doi:10.1002/bimj.4710290219

Cited by 8 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The estimated heritability for survival was higher than 1 when FSF were tested at Agnas (Table 5 ). This could be explained by (1) the high mortality rate (89%) among the FSF, which decreased the phenotypic variance and the precision of the estimation, and (2) the reduced number of sires and dams, which increased the probability of having an “inadmissible” estimated heritability higher than 1 [ 51 ].…”

Section: Discussionmentioning

confidence: 99%

Genetic parameters of resistance to Vibrio aestuarianus, and OsHV-1 infections in the Pacific oyster, Crassostrea gigas, at three different life stages

et al. 2017

View full text Add to dashboard Cite

BackgroundIn France, two main diseases threaten Pacific oyster production. Since 2008, Crassostrea gigas spat have suffered massive losses due to the ostreid herpesvirus OsHV-1, and since 2012, significant mortalities in commercial-size adults have been related to infection by the bacterium Vibrio aestuarianus. The genetic basis for resistance to V. aestuarianus and OsHV-1 and the nature of the genetic correlation between these two traits were investigated by using 20 half-sib sire families, each containing two full-sib families. For each disease, controlled infectious challenges were conducted using naïve oysters that were 3 to 26 months old. In addition, siblings were tested under field, pond and raceway conditions to determine whether laboratory trials reflected mortality events that occur in the oyster industry.ResultsFirst, we estimated the genetic basis of resistance to V. aestuarianus in C. gigas. Susceptibility to the infection was low for oysters in spat stage but increased with later life stages. Second, we confirmed a strong genetic basis of resistance to OsHV-1 infection at early stages and demonstrated that it was also strong at later stages. Most families had increased resistance to OsHV-1 infection from the spat to adult stages, while others consistently showed low or high mortality rates related to OsHV-1 infection, regardless of the life stage. Our third main finding was the absence of genetic correlations between resistance to OsHV-1 infection and resistance to V. aestuarianus infection.ConclusionsSelective breeding to enhance resistance to OsHV-1 infection could be achieved through selective breeding at early stages and would not affect resistance to V. aestuarianus infection. However, our results suggest that the potential to select for improved resistance to V. aestuarianus is lower. Selection for dual resistance to OsHV-1 and V. aestuarianus infection in C. gigas might reduce the impact of these two major diseases by selecting families that have the highest breeding values for resistance to both diseases.Electronic supplementary materialThe online version of this article (doi:10.1186/s12711-017-0297-2) contains supplementary material, which is available to authorized users.

show abstract

Section: Discussionmentioning

confidence: 99%

Genetic parameters of resistance to Vibrio aestuarianus, and OsHV-1 infections in the Pacific oyster, Crassostrea gigas, at three different life stages

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Given the estimated heritability in this study, disease prevalence of red thread in tall fescue can be effectively reduced through selection and breeding. Prabhakaran and Jain (1987) evaluated the probabilities of inadmissible estimates of heritability [i.e.

\Pr ( {{h^2} &lt; 0} )

and

\Pr ( {{h^2} &gt; 1} )

] in half‐sib analysis using linear regression under the frequentist framework, and pointed out that with the true value of

{h^2}

around 0.5,

\Pr ( {{h^2} &gt; 1} )

is invariably higher than

\Pr ( {{h^2} &lt; 0} )

for total numbers of half‐sibs being greater and equal to 100. In the genetic model presented earlier, all variance components were assumed to follow Gamma distributions; hence, the probability of negative heritability is 0.…”

Section: Discussionmentioning

confidence: 99%

Evaluation and genetic analysis of red thread (Laetisaria fuciformis) disease prevalence in tall fescue (Festuca arundinacea)

Green

Vines

et al. 2021

Intl Turfgrass Soc Res J

View full text Add to dashboard Cite

Red thread, caused by [Laetisaria fuciformis (Berk.) Burds.], is a common disease on many cool-season and some warm-season grasses throughout the world. Low reproducibility of experiments under both natural and artificial infection and inadequate understanding of the underlying genetics have limited the selection of turfgrass for resistance to red thread. This study investigated red thread prevalence of tall fescue (Festuca arundinacea Schreb.) populations in two locations over multiple years, estimated disease prevalence in a broad collection of tall fescue populations, and calculated heritability of disease prevalence with two different experimental designs. Collections from Albania and Romania, as well as those that were recently backcrossed to adapted germplasm, were more susceptible to red thread compared with the rest of the populations, highlighting the importance of selection efforts against red thread disease in tall fescue. Narrow-sense heritability (0.52, 0.74, and 0.48) estimated from different experimental designs were all in the range of moderate to high, indicating a large proportion of additive genetic variance in red thread prevalence among tall fescue populations. Hence, prevalence of red thread in tall fescue can be effectively reduced through selection and breeding. This is also the first report documenting the efficacy of family selection in reducing red thread prevalence in tall fescue.

show abstract

“…The limited amount of observed heritability for tiller count may originate from environment having a large effect on tillering. Heritability estimates greater than one, while theoretically impossible, have been shown to occur for characteristics of high heritability when sample sizes are small, and are indicative of high heritability (Prabhakaran and Jain, 1987). Within long-term nurseries, tillering can also be affected by competition with neighboring plants, thereby reducing uniformity.…”

Section: Discussionmentioning

confidence: 99%

“…For parent-progeny heritability, the combined and late flowering estimates were greater than one. Heritability estimates greater than one, while theoretically impossible, have been shown to occur for characteristics of high heritability when sample sizes are small, and are indicative of high heritability (Prabhakaran and Jain, 1987).…”

Section: Discussionmentioning

confidence: 99%

Inheritance of Secondary Morphological Traits for Among‐and‐Within‐Family Selection in Upland Tetraploid Switchgrass

Price

Casler

2014

Crop Science

View full text Add to dashboard Cite

Major efforts are currently being undertaken to improve biomass yield in switchgrass. Among‐and‐within‐family selection has been proposed as an efficient selection scheme to increase rates of genetic gain. The objectives of this study were to estimate the heritability of three yield‐related traits (plant height, tiller count, and flowering date) and evaluate the suitability of those traits as within‐family‐selection criteria. Divergent selections of parents were made for each trait from an upland‐tetraploid population developed for use in temperate North America. Progeny from these selections were used to estimate narrow‐sense heritability by both parent–progeny regression and response to selection. Moderate heritability (0.41) was estimated for plant height but was greater for selection of increased height. Heritability for tiller count was low overall (0.06), with greater values observed for reduced tillering selections. Flowering date was estimated to have high heritability (0.75) overall in both selection directions. Plant height and flowering date both appear heritable on a spaced‐plant basis and may be effective selection criteria for within‐family selection. The relative value of among‐and‐within‐family selection within a practical breeding program will vary depending on what selection criteria are used and the timing of selections.

show abstract

Probability of Inadmissible Estimates of Heritability from Regression and Half‐sib Analyses

Cited by 8 publications

References 6 publications

Genetic parameters of resistance to Vibrio aestuarianus, and OsHV-1 infections in the Pacific oyster, Crassostrea gigas, at three different life stages

Genetic parameters of resistance to Vibrio aestuarianus, and OsHV-1 infections in the Pacific oyster, Crassostrea gigas, at three different life stages

Evaluation and genetic analysis of red thread (Laetisaria fuciformis) disease prevalence in tall fescue (Festuca arundinacea)

Inheritance of Secondary Morphological Traits for Among‐and‐Within‐Family Selection in Upland Tetraploid Switchgrass

Contact Info

Product

Resources

About