Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/4519
Title: Description of lamb growth using random regression on field data
Contributor(s): Fischer, Troy (author); Van Der Werf, Julius Herman  (author)orcid ; 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
http://trove.nla.gov.au/work/10355225
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Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication

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