Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/6071
Title: Updated index weights for the Australian Profit Ranking in dairy cattle
Contributor(s): Pryce, Jennie (author); Van Der Werf, Julius H  (author)orcid ; Haile-Mariam, Mekonnen (author); Malcolm, Bill (author); Goddard, Mike (author)
Publication Date: 2009
Handle Link: https://hdl.handle.net/1959.11/6071
Abstract: Several alternative selection indexes for dairy cattle are reviewed as possible replacements for the current version of Australia Profit Ranking (APR) including: an economically optimal solution (the economic index) and two alternative indexes where the relative emphasis on fertility and fitness (compared to protein) is increased. As survival is positively correlated to yields of milk, fat and protein (production), the economic index is close to the maximum response which could be achieved for survival. However, fertility is more difficult to improve because the correlation between fertility and production is negative. To achieve a significant increase in response for fertility, its weight would have to increase considerably. Arbitrary multiples of the economic weight for survival and fertility were considered to investigate the impact on responses to selection. The index weight on survival was doubled and fertility quadrupled in the fitness index and the weight on fertility was doubled in the fertility index. Compared to the economic index, the loss in economic response was $1.40 (6%) for the fitness index and $0.21 (1%) for the fertility index. In the economic index, 53% of the total response is due to improvements in production traits, 37% is due to improved survival and 5% is due to fertility, with the remaining 5% for cell count, liveweight, temperament and milking speed. In the fitness index, the proportion of response due to production traits is 44%, survival 41% and fertility 9%. An index with more emphasis on fitness traits may improve the uptake of the APR. If this occurred it would have a favourable effect on overall genetic improvement of Australian dairy cattle.
Publication Type: Conference Publication
Conference Name: 18th Conference of the Association for the Advancement of Animal Breeding and Genetics, Barossa, Australia, 28 September - 1 October, 2009
Conference Details: 18th Conference of the Association for the Advancement of Animal Breeding and Genetics, Barossa, Australia, 28 September - 1 October, 2009
Source of Publication: Proceedings of the 18th Conference of the Association for the Advancement of Animal Breeding and Genetics: Matching Genetics and Environment - a New Look at an Old Topic, p. 143-146
Publisher: AAABG: Association for the Advancement of Animal Breeding and Genetics
Place of Publication: Taringa, Australia
ISSN: 1328-3227
Field of Research (FOR): 070201 Animal Breeding
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
Other Links: http://trove.nla.gov.au/work/36420775
http://www.aaabg.org/proceedings18/index.html
http://www.aaabg.org/proceedings18/files/pryce143.pdf
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Appears in Collections:Conference Publication
School of Environmental and Rural Science

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