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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.
MedLine Citation:
PMID:  20447780     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
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.
Authors:
B M Burns; G Fordyce; R G Holroyd
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-04-13
Journal Detail:
Title:  Animal reproduction science     Volume:  122     ISSN:  1873-2232     ISO Abbreviation:  Anim. Reprod. Sci.     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7807205     Medline TA:  Anim Reprod Sci     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1-22     Citation Subset:  IM    
Copyright Information:
Crown Copyright © 2010. Published by Elsevier B.V. All rights reserved.
Affiliation:
Department of Employment, Economic Development and Innovation, CQMC, Rockhampton, Queensland 4702, Australia. brian.burns@deedi.qld.gov.au
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