scholarly journals Converting multi-trait breeding objectives into operative selection indexes to ensure genetic gains in low-input sheep and goat breeding programmes

animal ◽  
2021 ◽  
Vol 15 (5) ◽  
pp. 100198
Author(s):  
J.P. Mueller ◽  
T. Getachew ◽  
M. Rekik ◽  
B. Rischkowsky ◽  
Z. Abate ◽  
...  
Keyword(s):  
Low Input ◽  
Genetic Gains ◽  
Breeding Objectives ◽  
Breeding Programmes ◽  
Selection Indexes

scholarly journals Prediction of genetic gains by selection indexes and REML/BLUP methodology in a population of sour passion fruit under recurrent selection

2017 ◽  
Vol 39 (2) ◽  
pp. 183 ◽  
Author(s):  
Fernando Higino de Lima e Silva ◽  
Alexandre Pio Viana ◽  
Jôsie Cloviane De Oliveira Freitas ◽  
Eileen Azevedo Santos ◽  
Daniele Lima Rodrigues ◽  
...  
Keyword(s):  
Recurrent Selection ◽  
Block Design ◽  
Total Yield ◽  
Passion Fruit ◽  
Soluble Solids ◽  
Transverse Diameter ◽  
Genetic Gains ◽  
Breeding Programmes ◽  
Selection Indexes ◽  
Selection Of

Breeding programmes must be improved to accelerate the development of new cultivars due to the commercial importance of passion fruit. This study compared four selection indexes and the REML/BLUP methodology in an assessment of predicted genetic gains in the traits of interest. A total of 81 full-sib progenies derived from the third cycle of recurrent selection were assessed for one harvest in one environment. The experiment was arranged in a randomized complete block design with five plants per plot. The following traits were assessed: number of fruits, total yield, fruit mass, fruit longitudinal diameter, fruit transverse diameter, fruit pulp percentage, shell thickness and content of soluble solids. The Mulamba & Mock index produced the best results for the selection of progenies. The REML/BLUP method was the most efficient and selected progenies with predicted genetic gains better than the selection indexes tested. 

Genetic gains and levels of relatedness from best linear unbiased prediction selection of Eucalyptus urophylla for pulp production in southeastern China

2000 ◽  
Vol 30 (10) ◽  
pp. 1601-1607 ◽  
Author(s):  
Xianming Wei ◽  
Nuno MG Borralho
Keyword(s):  
Tree Height ◽  
Best Linear Unbiased Prediction ◽  
Eucalyptus Urophylla ◽  
Multiple Trait ◽  
Southeastern China ◽  
Linear Unbiased Prediction ◽  
Genetic Gains ◽  
Breeding Objectives ◽  
Best Linear Unbiased ◽  
Unbiased Prediction

Breeding values for diameter at breast height (DBH), tree height (HT), relative bark thickness (BKR), and pilodyn penetration (PP) in Eucalyptus urophylla St. Blake plantations were predicted with best linear unbiased prediction (BLUP) approach. These values along with their economic weights derived from a previous study were then used to estimate economic genetic gains for three breeding objectives (pulp, woodchips, and wood volume) in southeastern China. The results showed substantial gain can be expected from selecting top 5% trees, with a reduction of up to US$35 for producing a tonne of ovendry pulp. However, actual gains can be strongly influenced by how the breeding objectives have been defined and whether the key traits have been included in the selection criteria. This study also showed that problem in the increase of coancestry associated with selection on BLUP would not be serious, with average coancestry amongst the selected population was less than 1%. More importantly, an unrestricted multiple-trait BLUP selection did not result in the same increase in relatedness in the selected population than it does for the single trait situation.

Breeding objectives for commercial silkworm lines in Iran

2005 ◽  
Vol 2005 ◽  
pp. 135-135
Author(s):  
S. Z. Mirhosseini ◽  
M. Ghanipoor ◽  
A. Shadparvar
Keyword(s):  
System Size ◽  
Biological Traits ◽  
Economic Values ◽  
Livestock Species ◽  
Breeding Objective ◽  
Present Generation ◽  
Breeding Objectives ◽  
Breeding Programmes ◽  
Definition Of ◽  
New Generation

Animal breeding generally aims to obtain a new generation of animals that will produce desired products more efficiently under future farm economic and social circumstances than the present generation of animals (Groen, 2000). Definition of the breeding objective is generally regarded as the primary step in the development of structured breeding programmes (Ponzoni, 1988). Clearly defined breeding objectives are vital for effective genetic improvement of all livestock species. So, they stipulate the animal characteristics to be improved and the desired direction for genetic change. The breeding objective involves calculation of economic values for all biological traits that have an impact upon profitability. This study focuses on the derivation of a breeding objective based on a profit function for three commercial silkworm lines in Iran and effect of limitation in production system size on economic values.

scholarly journals Genetic Variabilities and Genetic Gains for Yield Components in Regional Sugarcane Breeding Programmes on Réunion Island

Sugar Tech ◽  
2019 ◽  
Vol 21 (6) ◽  
pp. 868-878 ◽  
Author(s):  
Thomas Dumont ◽  
Audrey Thong-Chane ◽  
Laurent Barau ◽  
Bernard Siegmund ◽  
Jean-Yves Hoarau
Keyword(s):  
Yield Components ◽  
Reunion Island ◽  
Sugarcane Breeding ◽  
Genetic Gains ◽  
Réunion Island ◽  
Breeding Programmes

scholarly journals Selection indexes in the simultaneous increment of yield components in topcross hybrids of green maize

2020 ◽  
Vol 55 ◽  
Author(s):  
Willame dos Santos Candido ◽  
Caique Machado e Silva ◽  
Maraiza Lima Costa ◽  
Bruna Elaine de Almeida Silva ◽  
Beatriz Lima de Miranda ◽  
...  
Keyword(s):  
Yield Components ◽  
Block Design ◽  
Yield Traits ◽  
Genetic Gains ◽  
Economic Weights ◽  
Randomized Complete Block Design ◽  
Selection Indexes ◽  
Best Fit ◽  
Topcross Hybrids ◽  
Selection Of

Abstract: The objective of this work was to define the most suitable selective strategy for the simultaneous increment of yield components of green maize, by comparing three selection indexes weighted by economic weights and by the REML/BLUP method, in the assessment of predicted genetic gains for traits of interest. An experiment with 75 topcross hybrids from partially inbred S1 lines of green maize was carried out in Jataí, in the state of Goiás, Brazil, using a randomized complete block design, with four replicates. The following yield traits were evaluated: straw ears and commercial ears, grain mass, ear length, ear diameter, and number of ear rows. The selection indexes of Smith and Hazel, Williams, and Mulamba & Mock were applied and weighted for four economic weights (1, CVg, CVg/CVe, and h2). Among the tested selection indexes, those of Williams and Mulamba & Mock are the best-fit ones for the selection of topcross hybrids of green maize, as they provide positive and more balanced selection gains for all evaluated traits. The REML/BLUP method shows better predicted genetic gains than those achieved by the three selection indexes, besides being efficient for the selection of topcross hybrids of green maize.

scholarly journals Genetic gains in physic nut using selection indexes

2012 ◽  
Vol 47 (3) ◽  
pp. 402-408 ◽  
Author(s):  
Leonardo Lopes Bhering ◽  
Bruno Galvêas Laviola ◽  
Caio Césio Salgado ◽  
Carlos Felipe Barrera Sanchez ◽  
Tatiana Barbosa Rosado ◽  
...  
Keyword(s):  
Block Design ◽  
Selection Strategy ◽  
Physic Nut ◽  
Germplasm Bank ◽  
Genetic Gains ◽  
Canopy Volume ◽  
Randomized Complete Block Design ◽  
Length Width ◽  
Second Year ◽  
Selection Indexes

The objective of this work was to estimate genetic gains in physic nut (Jatropha curcas) using selection indexes and to establish the best selection strategy for the species. Direct and indirect selection was carried out using different selection indexes, totalizing 14 strategies. One hundred and seventy five families from the active germplasm bank of Embrapa Agroenergy, Brasília, Brazil, were analyzed in a randomized complete block design with two replicates. The evaluated traits were: grain yield; seeds per fruit; endosperm/seed ratio; seed weight, length, width, and thickness; branches per plant at 0.5, 1.0, and 1.5 m; plant height; stem diameter; canopy projection on rows and between lines; canopy volume; juvenility (days to the first flowering); and height of the first inflorescence. Evaluations were done during the second year of cultivation. The use of selection indexes is relevant to maximize the genetic gains in physic nut, favoring a better distribution of desirable traits. The multiplicative and restrictive indexes are considered the most promising for selection.

PROFILING OF GUAVA GENOTYPES GROWN IN VIDARBHA CONDITIONS ON THE BASIS OF MORPHOLOGICAL TRAITS

2017 ◽  
Vol 23 (1) ◽  
Author(s):  
R.A. PATIL ◽  
S.G. BHARAD ◽  
S.N. SAWANT
Keyword(s):  
Genetic Diversity ◽  
Genetic Variability ◽  
Morphological Traits ◽  
Considerable Extent ◽  
Fruit Traits ◽  
Breeding Programmes ◽  
Tree Leaf ◽  
Qualitative Characteristics ◽  
Intrapopulation Diversity

Assessment of genetic diversity in the available germplasm is the prerequisite for development of improved genotypes through planned breeding programmes. In the view of this Forty-eight genotypes of seedling origin guava along with 1 check (L-49/Sardar) collected and conserved at germplasm block, Main Garden, Department of Horticulture, Dr. P. D. A. University, Akola were evaluated for genetic variability and diversity based on the qualitative characteristics. The genotypes were evaluated for sixteen morphological traitsviz. tree, leaf, floral and fruit traits. Results Show considerable extent of variability amongst the 49 genotypes in each traits. A sizeable amount of intrapopulation diversity recorded can be used to identify diverse parents which can be utilized in hybridization programmes.

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