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Articles by Anders Christian Sorensen
Total Records ( 2 ) for Anders Christian Sorensen
  Anders Christian Sorensen and Elise Norberg
  In Denmark there are small populations of five Nordic sheep breeds, two of which are Danish in origin. The purpose of this study was to estimate trends in inbreeding for these breeds. All five breeds have been recording pedigrees for decades, so pedigree completeness is adequate. The rate of inbreeding is more than 1% per generation in all breeds, and more than 2% per generation in the Danish breeds, which have no options for importing, if they aim to continue pure breeding. The Danish breeds have not allowed recent animals to contribute heavily, so the rate of coancestry is not too high (∼1% per generation). However, they could use more rotation of rams between flocks to reduce the rate of inbreeding.
  Anders Christian Sorensen , Torsten Nygaard Kristensen , Volker Loeschcke , Noelia Ibanez and Daniel Sorensen
  The objective of this study was to test the hypothesis that the environmental variance of sternopleural bristle number in Drosophila melanogaster is partly under genetic control. We used data from 20 inbred lines and 10 control lines to test this hypothesis. Two models were used: a standard quantitative genetics model based on the infinitesimal model, and an extension of this model. In the extended model it is assumed that each individual has its own environmental variance and that this heterogeneity of variance has a genetic component. The heterogeneous variance model was favoured by the data, indicating that the environmental variance is partly under genetic control. If this heterogeneous variance model also applies to livestock, it would be possible to select for animals with a higher uniformity of products across environmental regimes. Also for evolutionary biology the results are of interest as genes affecting the environmental variance may be important for adaptation to changing environmental conditions.
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