A review of factors that impact on the capacity of beef cattle females to conceive, maintain a pregnancy and wean a calf: Implications for reproductive efficiency in northern Australia

Burns, B. M., Fordyce, G. and Holroyd, R. G. (2010) A review of factors that impact on the capacity of beef cattle females to conceive, maintain a pregnancy and wean a calf: Implications for reproductive efficiency in northern Australia. Animal Reproduction Science, 122 1-2: 1-22. doi:10.1016/j.anireprosci.2010.04.010

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Author Burns, B. M.
Fordyce, G.
Holroyd, R. G.
Title A review of factors that impact on the capacity of beef cattle females to conceive, maintain a pregnancy and wean a calf: Implications for reproductive efficiency in northern Australia
Journal name Animal Reproduction Science   Check publisher's open access policy
ISSN 0378-4320
1873-2232
Publication date 2010-10-01
Year available 2010
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1016/j.anireprosci.2010.04.010
Open Access Status DOI
Volume 122
Issue 1-2
Start page 1
End page 22
Total pages 22
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract A review of factors that may impact on the capacity of beef cattle females, grazing semi-extensive to extensive pastures in northern Australia, to conceive, maintain a pregnancy and wean a calf was conducted. Pregnancy and weaning rates have generally been used to measure the reproductive performance of herds. However, this review recognises that reproductive efficiency and the general measures associated with it more effectively describe the economic performance of beef cattle enterprises. More specifically, reproductive efficiency is influenced by (1) pregnancy rate which is influenced by (i) age at puberty; (ii) duration of post-partum anoestrus; (iii) fertilisation failure and (iv) embryo survival; while (2) weight by number of calves per breeding female retained for mating is influenced by (i) cow survival; (ii) foetal survival; and (iii) calf survival; and (3) overall lifetime calf weight weaned per mating. These measures of reproductive efficiency are discussed in depth. Further, a range of infectious and non-infectious factors, namely, environmental, physiological, breed and genetic factors and their impact on these stages of the reproductive cycle are investigated and implications for the northern Australian beef industry are discussed. Finally, conclusions and recommendations to minimise reproductive inefficiencies based on current knowledge are presented. Crown Copyright (C) 2010 Published by Elsevier By. All rights reserved.
Formatted abstract
A review of factors that may impact on the capacity of beef cattle females, grazing semi-extensive to extensive pastures in northern Australia, to conceive, maintain a pregnancy and wean a calf was conducted. Pregnancy and weaning rates have generally been used to measure the reproductive performance of herds. However, this review recognises that reproductive efficiency and the general measures associated with it more effectively describe the economic performance of beef cattle enterprises. More specifically, reproductive efficiency is influenced by (1) pregnancy rate which is influenced by (i) age at puberty; (ii) duration of post-partum anoestrus; (iii) fertilisation failure and (iv) embryo survival; while (2) weight by number of calves per breeding female retained for mating is influenced by (i) cow survival; (ii) foetal survival; and (iii) calf survival; and (3) overall lifetime calf weight weaned per mating. These measures of reproductive efficiency are discussed in depth. Further, a range of infectious and non-infectious factors, namely, environmental, physiological, breed and genetic factors and their impact on these stages of the reproductive cycle are investigated and implications for the northern Australian beef industry are discussed. Finally, conclusions and recommendations to minimise reproductive inefficiencies based on current knowledge are presented.
Crown Copyright © 2010 Published by Elsevier B.V. All rights reserved.
Keyword Beef Cattle
Northern Australia
Reproductive Inefficiencies
Conception
Pregnancy
Weaning
Heparin-binding Proteins
Ovarian Follicular Dynamics
Embryonic Mortality-rates
Bovine Luteal Cells
Indicus Cross Cows
Central Queensland
Estrous-cycle
Heat-stress
Postpartum Interval
Dominant Follicles
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID NBP.336
Institutional Status UQ

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: Official 2011 Collection
School of Agriculture and Food Sciences
Queensland Alliance for Agriculture and Food Innovation
 
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Citation counts: TR Web of Science Citation Count  Cited 37 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 08 Mar 2011, 00:47:48 EST