A combination of walk-back and 
optimum contribution selection in fish:  
 a simulation study

Sonesson, Anna K.

doi:10.1051/gse:2005020

Cited by 12 publications

(15 citation statements)

References 18 publications

(23 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, Sonesson (2005) presented a method that combines OC and walk-back selection. In her approach, a batch of phenotypically superior individuals is genotyped for markers and their relationships and breeding values are estimated.…”

Section: No Pedigree and No Markersmentioning

confidence: 99%

Management of genetic diversity in small farm animal populations

Fernández

Meuwissen

Toro

et al. 2011

Animal

View full text Add to dashboard Cite

Many local breeds of farm animals have small populations and, consequently, are highly endangered. The correct genetic management of such populations is crucial for their survival. Managing an animal population involves two steps: first, the individuals who will be permitted to leave descendants are to be chosen and the number offspring they will be permitted to produce has to be determined; second, the mating scheme has to be identified. Strategies dealing with the first step are directed towards the maximisation of effective population size and, therefore, act jointly on the reduction in the loss of genetic variation and in the increase of inbreeding. In this paper, the most relevant methods are summarised, including the so-called 'Optimum Contribution' methodology (contributions are proportional to the coancestry of each individual with the rest), which has been shown to be the best. Typically, this method is applied to pedigree information, but molecular marker data can be used to complete or replace the genealogy. When the population is subjected to explicit selection on any trait, the above methodology can be used by balancing the response to selection and the increase in coancestry/inbreeding. Different mating strategies also exist. Some of the mating schemes try to reduce the level of inbreeding in the short term by preventing mating between relatives. Others involve regular (circular) schemes that imply higher levels of inbreeding within populations in the short term, but demonstrate better performance in the long term. In addition, other tools such as cryopreservation and reproductive techniques aid in the management of small populations. In the future, genomic marker panels may replace the pedigree information in measuring the coancestry. The paper also includes the results of several experiments and field studies on the effectiveness and on the consequences of the use of the different strategies.

show abstract

Section: No Pedigree and No Markersmentioning

confidence: 99%

Management of genetic diversity in small farm animal populations

Fernández

Meuwissen

Toro

et al. 2011

Animal

View full text Add to dashboard Cite

show abstract

“…Hence, the original walk-back selection proposed within-family selection. Sonesson [28] modified the walk-back schemes such that inbreeding was controlled using optimum contribution selection [16]. By sampling around 100 individuals, 76-92% of the genetic gain was achieved compared to genotyping all selection candidates (5000 or 10 000).…”

Section: Discussionmentioning

confidence: 99%

Within-family marker-assisted selection for aquaculture species

Sonesson

2007

Genet Sel Evol

Self Cite

View full text Add to dashboard Cite

-A within-family marker-assisted selection scheme was designed for typical aquaculture breeding schemes, where most traits are recorded on sibs of the candidates. Here, sibs of candidates were tested for the trait and genotyped to establish genetic marker effects on the trait. BLUP breeding values were calculated, including information of the markers (MAS) or not (NONMAS). These breeding values were identical for all family members in the NONMAS schemes, but differed between family members in the MAS schemes, making within-family selection possible. MAS had up to twice the total genetic gain of the corresponding NONMAS scheme. MAS was somewhat less effective when heritability increased from 0.06 to 0.12 or when the frequency of the positive allele was < 0.5. The relative efficiency of MAS was higher for schemes with more candidates, because of larger fullsib family sizes. MAS was also more efficient when male:female mating ratio changed from 1:1 to 1:5 or when the QTL explained more of the total genetic variation. Four instead of two markers linked to the QTL increased genetic gain somewhat. There was no significant difference in polygenic genetic gain between MAS and NONMAS for most schemes. The rates of inbreeding were lower for MAS than NON-MAS schemes, because fewer full-sibs were selected by MAS. marker-assisted selection / aquaculture / breeding

show abstract

“…Managing inbreeding using walk-back selection (Sonesson, 2005) may not be practical in barramundi due to the difficulty in synchronising spawns and the highly variable sire contribution rate (Frost et al, 2006). The challenge is exacerbated as barramundi are cannibalistic (Parazo et al, 1991) and it may not be practical to mix families of ages more than one day old as they may have a size advantage they never relinquish (Tave, 1995).…”

Section: Managing Inbreeding For Long-term Selection Responsementioning

confidence: 99%

A novel breeding programme for improved growth in barramundi Lates calcarifer (Bloch) using foundation stock from progeny-tested parents

Macbeth¹,

Palmer²

2011

Aquaculture

View full text Add to dashboard Cite

a b s t r a c t a r t i c l e i n f oRapid genetic gains for growth in barramundi (Lates calcarifer) appear achievable by starting a breeding programme using foundation stock from progeny tested broodstock. The potential gains of this novel breeding design were investigated using biologically feasible scenarios tested with computer simulation models. The design involves the production of a large number of full-sib families using artificial mating which are compared in common growout conditions. The estimated breeding values of their paternal parents are calculated using a binomial probit analysis to assess their suitability as foundation broodstock. The programme can theoretically yield faster rates of genetic gain compared to other breeding programmes for aquaculture species. Assuming a heritability of 0.25 for growth, foundation broodstock evaluated in two years had breeding values for faster growth ranging from 21% to 51% depending on the genetic diversity of stock under evaluation. As a comparison it will take between nine and twenty-two years to identify broodstock with similar breeding values in a contemporary barramundi breeding programme.Crown

show abstract

A combination of walk-back and optimum contribution selection in fish: a simulation study

Cited by 12 publications

References 18 publications

Management of genetic diversity in small farm animal populations

Management of genetic diversity in small farm animal populations

Within-family marker-assisted selection for aquaculture species

A novel breeding programme for improved growth in barramundi Lates calcarifer (Bloch) using foundation stock from progeny-tested parents

Contact Info

Product

Resources

About