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Comparison of long-term breeding strategies using phenotype, clonal, progeny testing for Eucalyptus: 

Comparison of long-term breeding strategies using phenotype, clonal, progeny testing for Eucalyptus Darius Danusevičius1,2 and Dag Lindgren1 1- Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, S-901 83, Umeå, Sweden. 2- Lithuanian Forest Research Institute, Girionys, LT-4312, Kaunas reg., Lithuania.

Objective: comparing long term cycling strategies based on phenotype, clone or progeny testing by considering gain, diversity, cost and time : 

Objective: comparing long term cycling strategies based on phenotype, clone or progeny testing by considering gain, diversity, cost and time

Long-term benefit: 

Long-term benefit 1. Depth of the pocket

Long-term breeding benefit: 

Long-term breeding benefit Group Merit per time = (GAIN – C * DIVERSITY LOSS) / TIME

The long-term program: 

The long-term program Testing Recurrent cycles of mating, testing and balanced selection NS=50

Cycle time and cost: 

Cycle time and cost

Scenarios: 

Scenarios Low Main High While testing an alternative parameter value, the other parameters were at main scenario values lower reasonable bound Genetic parameters Time components Cost components assumed typical for Ecalyptus higher reasonable bound

And then we did the thing …: 

And then we did the thing … Results Parameters Breeding cycler at www.genfys.slu.se/staff/dagl.

Results: 

For all tested scenarios, clone strategy was superior Results

Slide10: 

Short rotation (=high J-M correlation at normal rotation), favored PH as it is cheap and the budget constraint allows fast testing (= higher gain per time). GMG/Y, %

Slide11: 

Dominance variance had a minor effect and was less favourable for Clone strategy. Diversity loss had a minor effect (~ 25 or 80 individuals). BP can be sublined according to BV of the members. For PH, cycles are shorter = faster loss of diversity; and if BP is small, PH ~ PR.

Conclusions: 

Conclusions Clonal testing is suggested to be the best testing strategy. Phenotype testing is most to its advantage at high h2. If clone testing is not an option, it seems preferable to progeny testing at short rotations and low budget. Progeny testing can be better than phenotype testing when h2 is very low, flowering early, budget high and rotation long.

Breeding Cycle Analyser: 

Breeding Cycle Analyser If your breeding plan is based on cycling and within family selection, then which is the best testing strategy for selection of the new parents? Find the answer by the aid of this simulator which allows you to consider gain, diversity, cost and time simultaneously. It is easy to use and is just a few mouse clicks away from you at www.genfys.slu.se/staff/dagl 1.Set the parameters common for all the testing alternatives 2. Set specific parameters for each testing alternative and find optimum test size and time