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|Title:||Description of lamb growth using random regression on field data||Contributor(s):||Fischer, Troy (author); Van Der Werf, Julius Herman (author) ; Banks, Robert (author); Ball, Alex (author)||Publication Date:||2003||Handle Link:||https://hdl.handle.net/1959.11/4519||Abstract:||Random regression (RR) has been proposed as an accurate method for evaluation of growth data, however this method has seldom been applied to data from an extensive industry where few records per animal exist. Consequently, field data containing weight records of Poll Dorset sheep from 50 to 500 days of age were analysed fitting a RR model. This model included quadratic polynomials for direct genetic and environmental and maternal environmental effects, a linear polynomial for maternal genetic effects and heterogeneous error variances. Direct heritability estimates increased steadily throughout time and were in agreement with literature estimates taken at specific ages. Some estimates for the highest ages with with the least records were considered too high, in particular direct heritability beyond 450 days. Variances due to maternal effects were low throughout the trajectory. Results show that covariances between weights of sheep for a considerable range of ages can be modelled adequately through random regressions.||Publication Type:||Conference Publication||Conference Name:||15th Conference of the Association for the Advancement of Animal Breeding and Genetics, Melbourne, Australia, 7th July - 11th July, 2003||Conference Details:||15th Conference of the Association for the Advancement of Animal Breeding and Genetics, Melbourne, Australia, 7th July - 11th July, 2003||Source of Publication:||Proceedings of the 15th Conference of the Association for the Advancement of Animal Breeding and Genetics: 50 years of DNA, p. 210-213||Publisher:||AAABG: Association for the Advancement of Animal Breeding and Genetics||Place of Publication:||Armidale, Australia||ISSN:||1328-3227||Field of Research (FOR):||070201 Animal Breeding||Socio-Economic Outcome Codes:||830310 Sheep - Meat||Peer Reviewed:||Yes||HERDC Category Description:||E1 Refereed Scholarly Conference Publication||Other Links:||http://www.aaabg.org/livestocklibrary/2003/210-213.pdf
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|Appears in Collections:||Animal Genetics and Breeding Unit (AGBU)|
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