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|Title:||Genomics Can Contribute to Selection to Improve Bottle Teats in Tropical Beef Genotypes||Contributor(s):||Wolcott, Matthew L (author); Johnston, David (author); Zhang, Yuandan (author)||Publication Date:||2017||Open Access:||Yes||Handle Link:||https://hdl.handle.net/1959.11/23431||Open Access Link:||http://agbu.une.edu.au/AAABG%202017/39Wolcott22171.pdf||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:||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 Twenty-second (22nd) Conference of the Association for the Advancement of Animal Breeding and Genetics, v.22, p. 171-174||Publisher:||AAABG: Association for the Advancement of Animal Breeding and Genetics||Place of Publication:||Fitzroy, Australia||ISSN:||1328-3227||Field of Research (FOR):||070201 Animal Breeding||Socio-Economic Objective (SEO):||830301 Beef Cattle||Peer Reviewed:||Yes||HERDC Category Description:||E1 Refereed Scholarly Conference Publication||Other Links:||http://agbu.une.edu.au/AAABG_2017.html
|Appears in Collections:||Animal Genetics and Breeding Unit (AGBU)|
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