Articles by Keyword: Realised Genetic Gains

Search results for Realised Genetic Gains

We found 106 results for you
  1. A comparison of collinearity mitigation techniques used in predicting BLUP breeding values and genetic gains over generations

    A comparison of collinearity mitigation techniques used in predicting BLUP breeding values and genetic gains over generations

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Collinearity potentially has a negative impact on the prediction of genetic gains in tree breeding programs. This study investigated the reliability and impact of best linear unbiased prediction (BLUP) using various collinearity mitigation techniques and of two computational numerical precisions...
  2. A comparison of deterministically predicted genetic gains with those realised in a South African <em>Eucalyptus grandis</em> breeding program

    A comparison of deterministically predicted genetic gains with those realised in a South African <em>Eucalyptus grandis</em> breeding program

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Tree breeders attempt to predict the genetic gains that are likely to be achieved through selection and breeding of new generations, using stochastic or deterministic modelling. There are many factors that may cause a discrepancy between the predicted and realised...
  3. Realised genetic gains and estimated genetic parameters of two <em>Eucalyptus grandis</em> × <em>E. urophylla</em> hybrid breeding strategies

    Realised genetic gains and estimated genetic parameters of two <em>Eucalyptus grandis</em> × <em>E. urophylla</em> hybrid breeding strategies

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Conventionally, Eucalyptus grandis × E. urophylla (GU) hybrid material is first tested as seedlings in progeny trials for at least four years before ortets are selected and ramets of the selected ortets are propagated to test in clonal trials. The...
  4. Program for the deterministic modelling of genetic gains of tree breeding and seed and clone production strategies

    Program for the deterministic modelling of genetic gains of tree breeding and seed and clone production strategies

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    A deterministic modelling algorithm was developed for the prediction of genetic gains of six breeding and 11 (seed and clone) production strategies. This algorithm can run iteratively over ranges of parameters which affect the genetic gains. These parameters are the...
  5. Harvesting genetics for productive plantations

    Harvesting genetics for productive plantations

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    Tree breeding has had significant impacts on the success of the South Mrica forest industry. Examples are cited for tree growth rate, where for instance, a mean genetic improvement of39% has been measured in F2 E.grandis over unimproved controls over...
  6. Estimates of genetic parameters and genetic gains for growth traits of two <em>Eucalyptus urophylla</em> populations in Zululand, South Africa

    Estimates of genetic parameters and genetic gains for growth traits of two <em>Eucalyptus urophylla</em> populations in Zululand, South Africa

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    In South Africa, Eucalyptus urophylla is an important species due to its disease tolerance to fungal diseases such as Crysoporthe austroafricana and the Coniothyrium sp. cankers. It is mainly planted as a parental species in a hybrid combination with E...
  7. Genetic Improvement of Timber Yield and Wood Quality in <em>Eucalyptus Grandis</em> (Hill) Maiden

    Item type: Journal Article • Journal: South African Forestry Journal
    Results of a partial diallel progeny test of Eucalyptus grandis assessed at ages 5, 36, 60 and 105 months are presented. Large genetic variations among full-sib families were found for all traits studied, e.g. the mean tree volume per family...
  8. Die evaluering van vier <em>Eragrostis curvula</em> ekotipes met weidende skape

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The evaluation of four Eragrostis curvula ecotypes with grazing sheep. Four ecotypes of Eragrostis curvula, namely, Cape Province 5, Ermelo, Pearston 204 and Makwassie 150 were evaluated in a grazing trial with sheep, at three stocking rates, during two growing...
  9. Influence of period of deferment before stocking spring‐burnt sourveld on sheep performance and veld productivity

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Spring‐burnt sourveld was stocked with Merino lambs after three different periods of deferment from the time of start of growth in spring. During three seasons, average seasonal livemass gains on veld which was stocked shortly after the start of growth...
  10. Evaluering en kalibrering van CERES-Maize. 1. Nie-lineêre regressie om genetiese parameters te bepaal

    Evaluering en kalibrering van CERES-Maize. 1. Nie-lineêre regressie om genetiese parameters te bepaal

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die genetiese parameters van die meeste plaaslike mielie cultivars wat as inset van CERES-Maize benodig word, is nog nie bepaal nie. Sodanige parameters kan met behulp van bestaande oesdata en fenologiese datums, uit veldproewe afgelei word. Programmatuur kan gebruik word...