Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/56136
Title: Remodelling the genetic evaluation of NFI in beef cattle - Part 2: Shortening the length of the feed intake test
Contributor(s): Vargovic, L  (author)orcid ; Moore, K L  (author)orcid ; Johnston, D J  (author)orcid ; Jeyaruban, G M  (author)orcid ; Girard, C J  (author)orcid ; Cook, J  (author)orcid ; Torres-Vazquez, J A  (author)orcid ; Miller, S P  (author)orcid 
Publication Date: 2023-07-26
Open Access: Yes
Handle Link: https://hdl.handle.net/1959.11/56136
Open Access Link: http://www.aaabg.org/aaabghome/AAABG25papers/95Vargovic25386.pdfOpen Access Link
Abstract: 

BREEDPLAN net feed intake (NFI) EBV is derived from a phenotypic regression based on a 70-day feed intake test. Genetic NFI (NFIg) EBVs have been proposed as an alternative EBV and this recent development may also allow for a shortened feed intake test period. This study used feed intake records of 3,088 Angus steers from the full 70-day test and compared them to daily feed intake (DFI) from shortened test periods. Results showed DFI from shortened test periods had similar means but increased phenotypic variation. Phenotypic correlation with DFI from the full test period decreased as the test period decreased in weekly intervals and ranged between 0.75 and 0.99. NFIg EBVs were predicted using DFI from different length tests. The mean of all NFIg EBVs was close to zero, but the EBV standard deviation increased as the test period decreased. Pearson correlations between NFIg EBVs from a full test period and reduced test periods ranged between 0.73 and 0.99, the regression slope of NFIg from reduced test periods on NFIg from the full test period ranged between 0.73 and 0.95, and the bias ranged between 0.00 and 0.02. These results indicate that as the test period decreases, the spread of EBVs increases, resulting in extreme animals having overestimated NFIg EBVs. A shortened DFI test period could be used to estimate NFIg EBVs.

Publication Type: Conference Publication
Conference Details: AAABG 2023: 25th Conference of the Association for the Advancement of Animal Breeding and Genetics, Perth, Australia, 26th - 28th July, 2023
Source of Publication: Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.25, p. 386-389
Publisher: Association for the Advancement of Animal Breeding and Genetics (AAABG)
Place of Publication: Armidale, Australia
ISSN: 1328-3227
Fields of Research (FoR) 2020: 300305 Animal reproduction and breeding
Socio-Economic Objective (SEO) 2020: 100401 Beef cattle
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
Publisher/associated links: http://www.aaabg.org/aaabghome/proceedings25.php
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication

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