Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/23431
Title: Genomics Can Contribute to Selection to Improve Bottle Teats in Tropical Beef Genotypes
Contributor(s): Wolcott, Matthew L  (author)orcid ; Johnston, David  (author)orcid ; Zhang, Yuandan  (author)orcid 
Publication Date: 2017
Open Access: Yes
Handle Link: https://hdl.handle.net/1959.11/23431
Open Access Link: http://www.aaabg.org/aaabghome/fullproc22.phpOpen Access Link
Abstract: Beef CRC research showed that a subjective score of teat size (small (1) to large (5)) was heritable in tropically adapted Brahman (BRAH) and Tropical Composite (TCOMP) cows, and that higher teat scores (bottle teats) were genetically associated with higher calf losses from birth to weaning. Teat traits are only expressed in females, and the research showed that they tended to display more variation in later life; making them ideal candidates for genomic selection. Front and rear teat scores (TSF and TSB respectively) were recorded in cows at calving through up to 6 matings. From these, a trait was created which described a cows maximum lifetime teat score (TSM), as well as a binary trait which distinguished cows that received a teat score of 4 or 5 at any time through their lives (1) from those which did not (0) (MSB). Results confirmed the heritability of TSF and TSB (h² = 0.30 to 0.40), and variation in both TSM and MSB was also shown to have a genetic basis (h² = 0.49 and 0.46 respectively for BRAH, and 0.29 and 0.22 for TCOMP). Genome wide association analyses identified large numbers of significant SNPs but did not suggest a likelihood of identifying a small number of SNPs of large effect. It is unlikely therefore, that a simple diagnostic test (based a small number of SNPs) could be developed for the traits. Conventional genomic selection, however, is likely to present opportunities to improving teat traits by selection in tropically adapted beef genotypes, with accuracies of genomic prediction of 0.23 to 0.35 for TSM and MSB across both genotypes.
Publication Type: Conference Publication
Conference Details: AAABG 2017: 22nd Conference of the Association for the Advancement of Animal Breeding and Genetics, Townsville, Australia, 2nd - 5th July, 2017
Source of Publication: Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.22, p. 171-174
Publisher: Association for the Advancement of Animal Breeding and Genetics (AAABG)
Place of Publication: Armidale, Australia
ISSN: 1328-3227
Fields of Research (FoR) 2008: 070201 Animal Breeding
Fields of Research (FoR) 2020: 300305 Animal reproduction and breeding
Socio-Economic Objective (SEO) 2008: 830301 Beef Cattle
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/
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication

Files in This Item:
5 files
File Description SizeFormat 
Show full item record

Page view(s)

2,714
checked on Apr 28, 2024

Download(s)

6
checked on Apr 28, 2024
Google Media

Google ScholarTM

Check


Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.