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Title
Remodelling the genetic evaluation of NFI in beef cattle - Part 1: Developing an equivalent genetic model
Author(s)
Jeyaruban, G M
Miller, S P
Publication Date
2023-07-26
Early Online Version
Open Access
Yes
Abstract
<p>Net feed intake (NFI) is the residual portion of daily feed intake (DFI) not explained by growth or maintenance requirements. The NFI phenotype (NFIp) is based on a 70-day test period where DFI and fortnightly weights (to calculate average daily gain (ADG) and maintenance as metabolic mid-weight (MMWT)) are measured. Recording NFIp is costly, and shortening the test length would be advantageous. However, research has shown that ADG cannot be accurately measured from a shortened test. Genetic NFI EBVs (NFIg) were calculated using DFI EBV adjusted for ADG and MMWT EBV and were shown to have a Pearson correlation of 0.99 with the NFIp EBV from 3,088 Angus steers. The regression slope between NFIg and NFIp EBVs was 1.14. Alternative NFIg models where growth and maintenance requirements were obtained from BREEDPLAN live weight traits instead of live weights recorded in the test period, demonstrated high Pearson correlations (r=0.87 to 0.93) and regression slopes between 0.63 and 0.97 with NFIp EBVs. Results suggest that genetic NFI EBVs can be obtained, with growth and maintenance requirements being determined from BREEDPLAN live weight traits. This provides the opportunity to determine if the length of the test to measure DFI can be shortened, reducing the cost of recording NFI per animal.</p>
Publication Type
Conference Publication
Source of Publication
Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.25, p. 382-385
Publisher
Association for the Advancement of Animal Breeding and Genetics (AAABG)
Socio-Economic Objective (SEO) 2020
2023
Place of Publication
Armidale, Australia
ISSN
1328-3227
Fields of Research (FoR) 2020
Socio-Economic Objective (SEO) 2020
Peer Reviewed
Yes
HERDC Category Description
Peer Reviewed
Yes
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