Selection, Maternal Effects and Inbreeding in Reindeer Husbandry
In extensive grazing systems where several owners ’ flocks are allowed to mix, selection strategies will also interact, due to gene flow between flocks. The aim of the thesis was to analyse breeding schemes in terms of genetic gain and rate of inbreeding (∆F), given the complexity of ownership and i...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.137.6759 2023-05-15T18:06:17+02:00 Selection, Maternal Effects and Inbreeding in Reindeer Husbandry Lars Rönnegård The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.137.6759 http://diss-epsilon.slu.se/archive/00000156/01/91-576-6400-5.fulltext.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.137.6759 http://diss-epsilon.slu.se/archive/00000156/01/91-576-6400-5.fulltext.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://diss-epsilon.slu.se/archive/00000156/01/91-576-6400-5.fulltext.pdf text ftciteseerx 2016-01-07T14:46:53Z In extensive grazing systems where several owners ’ flocks are allowed to mix, selection strategies will also interact, due to gene flow between flocks. The aim of the thesis was to analyse breeding schemes in terms of genetic gain and rate of inbreeding (∆F), given the complexity of ownership and interaction of selection strategies within a mixing reindeer population. The data, collected between 1986 and 1997 in the reindeer herding district of Ruvhten Sijte, Sweden, comprised 12,500 records of autumn calf weights. The mean phenotypic difference in calf weights between selected and non-selected flocks was 0.67 kg after 11 years of selection in Ruvhten Sijte. The genetic difference was 0.35 kg and the realized heritability was 0.2. Based on the realized heritablility, it was shown that if all owners had applied selection, the genetic response would have been 2 kg (corresponding to an annual genetic gain of 0.4 % of the phenotypic mean, including the initial lag due to age structure). The relationships between life-time patterns of female weight, calving incidence and offspring weight were examined. A female rearing a calf was shown to weigh 3.1 kg less in winter than one not rearing a calf. The regression coefficient of calf autumn weight on Text reindeer husbandry Unknown |
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description |
In extensive grazing systems where several owners ’ flocks are allowed to mix, selection strategies will also interact, due to gene flow between flocks. The aim of the thesis was to analyse breeding schemes in terms of genetic gain and rate of inbreeding (∆F), given the complexity of ownership and interaction of selection strategies within a mixing reindeer population. The data, collected between 1986 and 1997 in the reindeer herding district of Ruvhten Sijte, Sweden, comprised 12,500 records of autumn calf weights. The mean phenotypic difference in calf weights between selected and non-selected flocks was 0.67 kg after 11 years of selection in Ruvhten Sijte. The genetic difference was 0.35 kg and the realized heritability was 0.2. Based on the realized heritablility, it was shown that if all owners had applied selection, the genetic response would have been 2 kg (corresponding to an annual genetic gain of 0.4 % of the phenotypic mean, including the initial lag due to age structure). The relationships between life-time patterns of female weight, calving incidence and offspring weight were examined. A female rearing a calf was shown to weigh 3.1 kg less in winter than one not rearing a calf. The regression coefficient of calf autumn weight on |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Lars Rönnegård |
spellingShingle |
Lars Rönnegård Selection, Maternal Effects and Inbreeding in Reindeer Husbandry |
author_facet |
Lars Rönnegård |
author_sort |
Lars Rönnegård |
title |
Selection, Maternal Effects and Inbreeding in Reindeer Husbandry |
title_short |
Selection, Maternal Effects and Inbreeding in Reindeer Husbandry |
title_full |
Selection, Maternal Effects and Inbreeding in Reindeer Husbandry |
title_fullStr |
Selection, Maternal Effects and Inbreeding in Reindeer Husbandry |
title_full_unstemmed |
Selection, Maternal Effects and Inbreeding in Reindeer Husbandry |
title_sort |
selection, maternal effects and inbreeding in reindeer husbandry |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.137.6759 http://diss-epsilon.slu.se/archive/00000156/01/91-576-6400-5.fulltext.pdf |
genre |
reindeer husbandry |
genre_facet |
reindeer husbandry |
op_source |
http://diss-epsilon.slu.se/archive/00000156/01/91-576-6400-5.fulltext.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.137.6759 http://diss-epsilon.slu.se/archive/00000156/01/91-576-6400-5.fulltext.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766177893916868608 |