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Prediction of mortality and conception rates of beef breeding cattle in northern Australia

Mayer, D. G. and McKeon, G. M. and Moore, A. D. (2012) Prediction of mortality and conception rates of beef breeding cattle in northern Australia. Animal Production Science, 52 (5). pp. 329-337. ISSN 1836-0939

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Article Link(s): http://dx.doi.org/10.1071/an11204

Abstract

In current simulation packages for the management of extensive beef-cattle enterprises, the relationships for the key biological rates (namely conception and mortality) are quite rudimentary. To better estimate these relationships, cohort-level data covering 17 100 cow-years from six sites across northern Australia were collated and analysed. Further validation data, from 7200 cow-years, were then used to test these relationships. Analytical problems included incomplete and non-standardised data, considerable levels of correlation among the 'independent' variables, and the close similarity of alternate possible models. In addition to formal statistical analyses of these data, the theoretical equations for predicting mortality and conception rates in the current simulation models were reviewed, and then reparameterised and recalibrated where appropriate. The final models explained up to 80% of the variation in the data. These are now proposed as more accurate and useful models to be used in the prediction of biological rates in simulation studies for northern Australia. © The State of Queensland (through the Department of Agriculture, Fisheries and Forestry) 2012. © CSIRO.

Item Type:Article
Business groups:Animal Science
Additional Information:24.07.12 DAFF DL . Publisher: CSIRO PUBLISHING
Keywords:Indicus cross cows; Brahman-shorthorn; dry tropics; reproductive rates; mature weight; performance; productivity; liveweights; pregnancy; body condition ratio, body condition score, breed, lactation status, Queensland.
Subjects:Animal culture > Breeding and breeds
Animal culture > Cattle
Deposited On:25 Feb 2014 06:42
Last Modified:08 Jun 2015 16:01

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