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Title: Selection Strategies for Breeding Objectives in Growing Pigs
Contributor(s): Hermesch, Susanne  (author)orcid ; Arnal, M M A (author); Boerner, Vinzent  (author); Dominik, Sonja  (author)orcid 
Publication Date: 2015
Open Access: Yes
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Abstract: Breeding objectives (BO) have been extended recently for sire lines in Australia to include average daily gain (ADG), backfat, post-weaning survival (PWS), loin weight and belly weight and some consideration of feed cost as either feed conversion ratio (FCR) or daily feed intake (DFI). This study evaluated six selection strategies for two BO that included either FCR or DFI using genetic parameters previously estimated for Australian populations. Response was expressed for one round of selection and a selection intensity of one which is similar to the annual genetic gain that can be achieved in practice. The predicted response in the BO with FCR varied from $3.61 to $4.59 per pig and from $3.48 to $4.00 for the BO with DFI. The lower response in the BO with DFI was partly due to unfavourable genetic association of DFI with ADG. Although PWS was the most important trait in the BO relative to the genetic variation, response in PWS was less than 0.0009 (or 0.09%) due to limited information available for selection candidates. No genetic associations between PWS and other traits were modelled because this information is currently lacking and response in PWS will depend on its genetic associations with other traits. Adding FCR records to the selection index increased response in the BO by 3.6% only because FCR has multiple favourable genetic associations with other traits. In contrast, selection response in DFI was achieved only when juvenile IGF1 and/or DFI were recorded. Therefore, considering feed costs in the BO with DFI is most effective if DFI is also recorded.
Publication Type: Conference Publication
Conference Details: 21st Conference of the Association for the Advancement of Animal Breeding and Genetics, Lorne, Australia, 28th - 30th September, 2015
Source of Publication: Proceedings of the Twenty-first Conference of the Association for the Advancement of Animal Breeding and Genetics, p. 1-4
Publisher: AAABG: Association for the Advancement of Animal Breeding and Genetics
Place of Publication: Bundoora, Australia
Field of Research (FOR): 070201 Animal Breeding
Socio-Economic Objective (SEO): 830308 Pigs
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
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Series Name: Proceedings of the AAABG ... Conference
Series Number : 21
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Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
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