Selection For Reduced Mature Cow Weight Should Not Reduce Body Condition Unless Accompanied By Selection For Increased Fat

W S Pitchford; S J Lee; K Donoghue; Bradley J Walmsley

Selection For Reduced Mature Cow Weight Should Not Reduce Body Condition Unless Accompanied By Selection For Increased Fat

W S Pitchford
, S J Lee
, K Donoghue
, Bradley J Walmsley

Animal Genetics and Breeding Unit

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

Abstract

A large number of Angus cows (3,768) were ultrasound scanned for eye muscle area, rib and rump fat depth and intramuscular fat both as yearlings and at weaning of their first calf. They also had weight, height and body condition recorded. Response to selection for a number of scenarios was evaluated following current industry index weightings. Single trait selection for reduced cow weight at time of weaning her calf would result in shorter cows with less fat, muscle and condition. However, selection indices that include some positive weighting on carcass fat (low weighting on subcutaneous fat depth or large weighting on intramuscular fat) would result in increased body condition of cows even when adjusted for changes in weight or mature size. Recently updated Angus selection indices do have positive weightings on both subcutaneous and intramuscular fat.

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	189-192
Volume	21
ISBN (Print)	9780646945545
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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Pitchford, W. S., Lee, S. J., Donoghue, K., & Walmsley, B. J. (2015). Selection For Reduced Mature Cow Weight Should Not Reduce Body Condition Unless Accompanied By Selection For Increased Fat. 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. 189-192). Association for the Advancement of Animal Breeding and Genetics (AAABG). http://www.aaabg.org/aaabghome/AAABG21papers/Pitchford21189.pdf

Pitchford, W S ; Lee, S J ; Donoghue, K et al. / Selection For Reduced Mature Cow Weight Should Not Reduce Body Condition Unless Accompanied By Selection For Increased Fat. 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. 189-192

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title = "Selection For Reduced Mature Cow Weight Should Not Reduce Body Condition Unless Accompanied By Selection For Increased Fat",

abstract = "A large number of Angus cows (3,768) were ultrasound scanned for eye muscle area, rib and rump fat depth and intramuscular fat both as yearlings and at weaning of their first calf. They also had weight, height and body condition recorded. Response to selection for a number of scenarios was evaluated following current industry index weightings. Single trait selection for reduced cow weight at time of weaning her calf would result in shorter cows with less fat, muscle and condition. However, selection indices that include some positive weighting on carcass fat (low weighting on subcutaneous fat depth or large weighting on intramuscular fat) would result in increased body condition of cows even when adjusted for changes in weight or mature size. Recently updated Angus selection indices do have positive weightings on both subcutaneous and intramuscular fat.",

keywords = "Animal Breeding",

author = "Pitchford, \{W S\} and Lee, \{S J\} and K Donoghue and Walmsley, \{Bradley J\}",

year = "2015",

language = "English",

isbn = "9780646945545",

volume = "21",

pages = "189--192",

editor = "Kim Bunter and Tim Byrne and Hans Daetwyler and Susanne Hermesch and Kathryn Kemper and James Kijas and David Nation and Wayne Pitchford and Suzanne Rowe and Matt Shaffer and \{van Eenennaam\}, Alison",

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",

}

Pitchford, WS, Lee, SJ, Donoghue, K & Walmsley, BJ 2015, Selection For Reduced Mature Cow Weight Should Not Reduce Body Condition Unless Accompanied By Selection For Increased Fat. 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. 189-192, 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/Pitchford21189.pdf>

Selection For Reduced Mature Cow Weight Should Not Reduce Body Condition Unless Accompanied By Selection For Increased Fat. / Pitchford, W S; Lee, S J; Donoghue, K et al.
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. 189-192.

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

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T1 - Selection For Reduced Mature Cow Weight Should Not Reduce Body Condition Unless Accompanied By Selection For Increased Fat

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AU - Lee, S J

AU - Donoghue, K

AU - Walmsley, Bradley J

PY - 2015

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N2 - A large number of Angus cows (3,768) were ultrasound scanned for eye muscle area, rib and rump fat depth and intramuscular fat both as yearlings and at weaning of their first calf. They also had weight, height and body condition recorded. Response to selection for a number of scenarios was evaluated following current industry index weightings. Single trait selection for reduced cow weight at time of weaning her calf would result in shorter cows with less fat, muscle and condition. However, selection indices that include some positive weighting on carcass fat (low weighting on subcutaneous fat depth or large weighting on intramuscular fat) would result in increased body condition of cows even when adjusted for changes in weight or mature size. Recently updated Angus selection indices do have positive weightings on both subcutaneous and intramuscular fat.

AB - A large number of Angus cows (3,768) were ultrasound scanned for eye muscle area, rib and rump fat depth and intramuscular fat both as yearlings and at weaning of their first calf. They also had weight, height and body condition recorded. Response to selection for a number of scenarios was evaluated following current industry index weightings. Single trait selection for reduced cow weight at time of weaning her calf would result in shorter cows with less fat, muscle and condition. However, selection indices that include some positive weighting on carcass fat (low weighting on subcutaneous fat depth or large weighting on intramuscular fat) would result in increased body condition of cows even when adjusted for changes in weight or mature size. Recently updated Angus selection indices do have positive weightings on both subcutaneous and intramuscular fat.

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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)

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ER -

Pitchford WS, Lee SJ, Donoghue K, Walmsley BJ. Selection For Reduced Mature Cow Weight Should Not Reduce Body Condition Unless Accompanied By Selection For Increased Fat. 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. 189-192

Selection For Reduced Mature Cow Weight Should Not Reduce Body Condition Unless Accompanied By Selection For Increased Fat

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