Unrecognized variation in gestation length and birth weight of Droughtmaster calves produced through fixed-time AI

Burns, B. M., Herring, A. D., Laing, A., Fordyce, G., Bertram, J., Grant, T. and Hiendleder, S. (2010). Unrecognized variation in gestation length and birth weight of Droughtmaster calves produced through fixed-time AI. In: M. C. Lucy, J. L. Pate, M. F. Smith and T. E. Spencer, Reproduction in Domestic Ruminants. Ruminant Reproduction 2010: 8th International Ruminant Reproduction Symposium, Anchorage, AK, U.S.A., (585-585). 3-7 September 2010.

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Domestic_Ruminants_VII.pdf HERDC combined - not publicly available application/pdf 690.34KB 4
Author Burns, B. M.
Herring, A. D.
Laing, A.
Fordyce, G.
Bertram, J.
Grant, T.
Hiendleder, S.
Title of paper Unrecognized variation in gestation length and birth weight of Droughtmaster calves produced through fixed-time AI
Conference name Ruminant Reproduction 2010: 8th International Ruminant Reproduction Symposium
Conference location Anchorage, AK, U.S.A.
Conference dates 3-7 September 2010
Proceedings title Reproduction in Domestic Ruminants
Place of Publication Thrumpton, Nottingham, U.K.
Publisher Nottingham University Press
Publication Year 2010
Sub-type Fully published paper
ISBN 9781907284144
1907284141
9781907284991
1907284990
Editor M. C. Lucy
J. L. Pate
M. F. Smith
T. E. Spencer
Volume VII
Start page 585
End page 585
Total pages 1
Collection year 2011
Language eng
Formatted Abstract/Summary
Large variation in gestation length and birth weight has been widely documented among reciprocal crosses of Bos indicus and Bos taurus cattle. Historically, this was thought to be a function of maternal uterine influence such as blood flow. This phenomenon, however, also exists in embryo transfer calves where all surrogate dams are of the same genotype. In 2007, a collaborative project was initiated to investigate epigenetic influence on growth and size traits in several defined Bos indicus-Bos taurus populations in Australia and the United States.

This report describes variability for gestation length (GL) and birth weight (BWT) in 33 Droughtmaster calves produced through fixed-time AI in northern Queensland. Droughtmaster is a stabilized Bos indicus (50%), Bos taurus (50%) composite breed established in Australia.

Potential interactions between maternal and fetal genotypes are likely to be important predictors of birth weight and gestation length in Bos indicus-Bos taurus composite calves, and placental traits may be more useful to predict birth weight than early fetal measurements. We hypothesize that epigenetic influences may contribute to previously unexplained variation in many production traits where Bos indicus-Bos taurus crosses are used and should continue to be investigated.
Subjects 070202 Animal Growth and Development
Q-Index Code EX
Q-Index Status Confirmed Code
Institutional Status Non-UQ

 
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Created: Tue, 15 Mar 2011, 08:57:16 EST by Samantha Richards on behalf of Qld Alliance for Agriculture and Food Innovation