Impact of Scanning Lean Cattle on the Genetic Correlation Between Scan and Carcase Intramuscular Fat in Angus and Hereford Cattle

Samuel Walkom; M Gilbert Jeyaruban; David Johnston

Impact of Scanning Lean Cattle on the Genetic Correlation Between Scan and Carcase Intramuscular Fat in Angus and Hereford Cattle

Samuel Walkom
, M Gilbert Jeyaruban
, David Johnston

Animal Genetics and Breeding Unit

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

BREEDPLAN, the Australian beef cattle genetic evaluation system, uses ultrasound scan intramuscular fat as a correlated trait for predicting carcase intramuscular fat. More recently, it has been observed that seedstock herds are being scanned at younger ages and lower levels of fatness and this research was undertaken to examine the effect on heritability and the genetic correlation estimates when scan records are removed using fat depth thresholds. Using BREEDPLAN data to estimate these genetic relationships, this study yielded genetic correlation estimates of 0.37 and 0.36 in Angus and 0.69 and 0.54 in Hereford for bull and heifer scan intramuscular fat, respectively. The results showed a useful improvement in the genetic correlation between bull intramuscular fat and carcase intramuscular fat in Angus cattle to 0.48. However, for Angus heifers and Hereford bulls and heifers there was no significant improvement, suggesting that strategies to reduce lean scanning will not improve the genetic correlation estimates in those cases.

Original language	English
Title of host publication	Proceedings of the Association for the Advancement of Animal Breeding and Genetics
Editors	Kim Bunter, Tim Byrne, Hans Daetwyler, Susanne Hermesch, Kathryn Kemper, James Kijas, David Nation, Wayne Pitchford, Suzanne Rowe, Matt Shaffer, Alison van Eenennaam
Place of Publication	Armidale, Australia
Publisher	Association for the Advancement of Animal Breeding and Genetics (AAABG)
Pages	253-256
Volume	21
ISBN (Print)	978-0-646-94554-5
Publication status	Published - 2015
Event	AAABG 2015: 21st Conference of the Association for the Advancement of Animal Breeding and Genetics - Lorne, Australia Duration: 28 Sept 2015 → 30 Sept 2015

Conference

Conference	AAABG 2015: 21st Conference of the Association for the Advancement of Animal Breeding and Genetics
City	Lorne, Australia
Period	28/09/15 → 30/09/15

Keywords

Animal Breeding

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Walkom, S., Jeyaruban, M. G., & Johnston, D. (2015). Impact of Scanning Lean Cattle on the Genetic Correlation Between Scan and Carcase Intramuscular Fat in Angus and Hereford Cattle. In K. Bunter, T. Byrne, H. Daetwyler, S. Hermesch, K. Kemper, J. Kijas, D. Nation, W. Pitchford, S. Rowe, M. Shaffer, & A. van Eenennaam (Eds.), Proceedings of the Association for the Advancement of Animal Breeding and Genetics (Vol. 21, pp. 253-256). Association for the Advancement of Animal Breeding and Genetics (AAABG). http://www.aaabg.org/aaabghome/AAABG21papers/Walkom21253.pdf

Walkom, Samuel ; Jeyaruban, M Gilbert ; Johnston, David. / Impact of Scanning Lean Cattle on the Genetic Correlation Between Scan and Carcase Intramuscular Fat in Angus and Hereford Cattle. Proceedings of the Association for the Advancement of Animal Breeding and Genetics. editor / Kim Bunter ; Tim Byrne ; Hans Daetwyler ; Susanne Hermesch ; Kathryn Kemper ; James Kijas ; David Nation ; Wayne Pitchford ; Suzanne Rowe ; Matt Shaffer ; Alison van Eenennaam. Vol. 21 Armidale, Australia : Association for the Advancement of Animal Breeding and Genetics (AAABG), 2015. pp. 253-256

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title = "Impact of Scanning Lean Cattle on the Genetic Correlation Between Scan and Carcase Intramuscular Fat in Angus and Hereford Cattle",

abstract = "BREEDPLAN, the Australian beef cattle genetic evaluation system, uses ultrasound scan intramuscular fat as a correlated trait for predicting carcase intramuscular fat. More recently, it has been observed that seedstock herds are being scanned at younger ages and lower levels of fatness and this research was undertaken to examine the effect on heritability and the genetic correlation estimates when scan records are removed using fat depth thresholds. Using BREEDPLAN data to estimate these genetic relationships, this study yielded genetic correlation estimates of 0.37 and 0.36 in Angus and 0.69 and 0.54 in Hereford for bull and heifer scan intramuscular fat, respectively. The results showed a useful improvement in the genetic correlation between bull intramuscular fat and carcase intramuscular fat in Angus cattle to 0.48. However, for Angus heifers and Hereford bulls and heifers there was no significant improvement, suggesting that strategies to reduce lean scanning will not improve the genetic correlation estimates in those cases.",

keywords = "Animal Breeding",

author = "Samuel Walkom and Jeyaruban, \{M Gilbert\} and David Johnston",

year = "2015",

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isbn = "978-0-646-94554-5",

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booktitle = "Proceedings of the Association for the Advancement of Animal Breeding and Genetics",

publisher = "Association for the Advancement of Animal Breeding and Genetics (AAABG)",

note = "AAABG 2015: 21st Conference of the Association for the Advancement of Animal Breeding and Genetics ; Conference date: 28-09-2015 Through 30-09-2015",

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Walkom, S, Jeyaruban, MG & Johnston, D 2015, Impact of Scanning Lean Cattle on the Genetic Correlation Between Scan and Carcase Intramuscular Fat in Angus and Hereford Cattle. in K Bunter, T Byrne, H Daetwyler, S Hermesch, K Kemper, J Kijas, D Nation, W Pitchford, S Rowe, M Shaffer & A van Eenennaam (eds), Proceedings of the Association for the Advancement of Animal Breeding and Genetics. vol. 21, Association for the Advancement of Animal Breeding and Genetics (AAABG), Armidale, Australia, pp. 253-256, AAABG 2015: 21st Conference of the Association for the Advancement of Animal Breeding and Genetics, Lorne, Australia, 28/09/15. <http://www.aaabg.org/aaabghome/AAABG21papers/Walkom21253.pdf>

Impact of Scanning Lean Cattle on the Genetic Correlation Between Scan and Carcase Intramuscular Fat in Angus and Hereford Cattle. / Walkom, Samuel; Jeyaruban, M Gilbert; Johnston, David.
Proceedings of the Association for the Advancement of Animal Breeding and Genetics. ed. / Kim Bunter; Tim Byrne; Hans Daetwyler; Susanne Hermesch; Kathryn Kemper; James Kijas; David Nation; Wayne Pitchford; Suzanne Rowe; Matt Shaffer; Alison van Eenennaam. Vol. 21 Armidale, Australia: Association for the Advancement of Animal Breeding and Genetics (AAABG), 2015. p. 253-256.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Impact of Scanning Lean Cattle on the Genetic Correlation Between Scan and Carcase Intramuscular Fat in Angus and Hereford Cattle

AU - Walkom, Samuel

AU - Jeyaruban, M Gilbert

AU - Johnston, David

PY - 2015

Y1 - 2015

N2 - BREEDPLAN, the Australian beef cattle genetic evaluation system, uses ultrasound scan intramuscular fat as a correlated trait for predicting carcase intramuscular fat. More recently, it has been observed that seedstock herds are being scanned at younger ages and lower levels of fatness and this research was undertaken to examine the effect on heritability and the genetic correlation estimates when scan records are removed using fat depth thresholds. Using BREEDPLAN data to estimate these genetic relationships, this study yielded genetic correlation estimates of 0.37 and 0.36 in Angus and 0.69 and 0.54 in Hereford for bull and heifer scan intramuscular fat, respectively. The results showed a useful improvement in the genetic correlation between bull intramuscular fat and carcase intramuscular fat in Angus cattle to 0.48. However, for Angus heifers and Hereford bulls and heifers there was no significant improvement, suggesting that strategies to reduce lean scanning will not improve the genetic correlation estimates in those cases.

AB - BREEDPLAN, the Australian beef cattle genetic evaluation system, uses ultrasound scan intramuscular fat as a correlated trait for predicting carcase intramuscular fat. More recently, it has been observed that seedstock herds are being scanned at younger ages and lower levels of fatness and this research was undertaken to examine the effect on heritability and the genetic correlation estimates when scan records are removed using fat depth thresholds. Using BREEDPLAN data to estimate these genetic relationships, this study yielded genetic correlation estimates of 0.37 and 0.36 in Angus and 0.69 and 0.54 in Hereford for bull and heifer scan intramuscular fat, respectively. The results showed a useful improvement in the genetic correlation between bull intramuscular fat and carcase intramuscular fat in Angus cattle to 0.48. However, for Angus heifers and Hereford bulls and heifers there was no significant improvement, suggesting that strategies to reduce lean scanning will not improve the genetic correlation estimates in those cases.

KW - Animal Breeding

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SN - 978-0-646-94554-5

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BT - Proceedings of the Association for the Advancement of Animal Breeding and Genetics

A2 - Bunter, Kim

A2 - Byrne, Tim

A2 - Daetwyler, Hans

A2 - Hermesch, Susanne

A2 - Kemper, Kathryn

A2 - Kijas, James

A2 - Nation, David

A2 - Pitchford, Wayne

A2 - Rowe, Suzanne

A2 - Shaffer, Matt

A2 - van Eenennaam, Alison

PB - Association for the Advancement of Animal Breeding and Genetics (AAABG)

CY - Armidale, Australia

T2 - AAABG 2015: 21st Conference of the Association for the Advancement of Animal Breeding and Genetics

Y2 - 28 September 2015 through 30 September 2015

ER -

Walkom S, Jeyaruban MG, Johnston D. Impact of Scanning Lean Cattle on the Genetic Correlation Between Scan and Carcase Intramuscular Fat in Angus and Hereford Cattle. In Bunter K, Byrne T, Daetwyler H, Hermesch S, Kemper K, Kijas J, Nation D, Pitchford W, Rowe S, Shaffer M, van Eenennaam A, editors, Proceedings of the Association for the Advancement of Animal Breeding and Genetics. Vol. 21. Armidale, Australia: Association for the Advancement of Animal Breeding and Genetics (AAABG). 2015. p. 253-256

Impact of Scanning Lean Cattle on the Genetic Correlation Between Scan and Carcase Intramuscular Fat in Angus and Hereford Cattle

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