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Article << Previous     |     Next >>   Contents Vol 52(5)

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

D. G. Mayer A D, G. M. McKeon B and A. D. Moore C

A Agri-Science Queensland, Department of Agriculture, Fisheries and Forestry, Ecosciences Precinct, 41 Boggo Road, Dutton Park, Qld 4102, Australia.
B Office of Climate Change, Department of Environment and Resource Management, Ecosciences Precinct, 41 Boggo Road, Dutton Park, Qld 4102, Australia.
C CSIRO Sustainable Agriculture Flagship, GPO Box 1600, Canberra, ACT 2061, Australia.
D Corresponding author. Email: david.mayer@dpi.qld.gov.au

Animal Production Science 52(5) 329-337 http://dx.doi.org/10.1071/AN11204
Submitted: 27 September 2011  Accepted: 27 January 2012   Published: 10 May 2012


 
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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.

Additional keywords: body condition ratio, body condition score, breed, lactation status, pregnancy.


References

Anderson VJ (1989) Factors affecting conception rates of beef cows in the spear grass region of north Queensland. MSc Thesis, James Cook University, Townsville, Qld.

Brody S (1945) ‘Bioenergetics and growth.’ (Reinhold: New York)

Fordyce G, Tyler R, Anderson VJ (1990) Effect of reproductive status, body condition and age of Bos indicus cross cows early in a drought on survival and subsequent reproductive performance. Australian Journal of Experimental Agriculture 30, 315–322.
CrossRef |

Fordyce G, James TA, Holroyd RG, Beaman NJ, Mayer RJ, O’Rourke PK (1993) The performance of Brahman–Shorthorn and Sahiwal–Shorthorn beef cattle in the dry tropics of northern Queensland. 3. Birth weights and growth to weaning. Australian Journal of Experimental Agriculture 33, 119–127.
CrossRef |

Freer M, Moore AD, Donnelly JR (1997) GRAZPLAN: decision support systems for Australian grazing enterprises – II. The animal biology model for feed intake, production and reproduction and the GrazFeed DSS. Agricultural Systems 54, 77–126.
CrossRef |

Freer M, Moore AD, Donnelly JR (2009) The GRAZPLAN animal biology model for sheep and cattle and the GrazFeed decision support tool. CSIRO Plant Industry Technical Paper (based on Freer et al. 1997, revised to match ver. 5.0.2 of GrazFeed). Available at http://www.pi.csiro.au/grazplan/files/TechPaperApr09.pdf [verified 23 January 2011].

Frisch JE (1973) Comparative drought resistance of Bos Indicus and Bos Taurus crossbred herds in central Queensland. 2. Relative mortality rates, calf birth weights, and weights and weight changes of breeding cows. Australian Journal of Experimental Agriculture and Animal Husbandry 13, 117–133.
CrossRef |

Hall WB, McKeon GM, Carter JO, Day KA, Howden SM, Scanlan JC, Johnston PW, Burrows WH (1998) Climate change in Queensland’s grazing lands: II. An assessment of the impact on animal production from native pastures. The Rangeland Journal 20, 177–205.
CrossRef |

Holmes WE (1995) ‘BREEDCOW and DYNAMA – Herd budgeting software package.’ (Queensland Department of Primary Industries: Townsville, Qld)

Holroyd RG, James TA, Doogan VJ, Fordyce G, O’Rourke PK (1990a) The performance of Brahman–Shorthorn and Sahiwal–Shorthorn beef cattle in the dry tropics of northern Queensland. 1. Reproductive rates and liveweights of F1 and backcross females. Australian Journal of Experimental Agriculture 30, 717–725.
CrossRef |

Holroyd RG, James TA, Doogan VJ, Fordyce G, Tyler R, O’Rourke PK (1990b) The performance of Brahman–Shorthorn and Sahiwal–Shorthorn beef cattle in the dry tropics of northern Queensland. 2. Reproductive rates and liveweights of F2 et seq. females. Australian Journal of Experimental Agriculture 30, 727–733.
CrossRef |

Mackinnon MJ, Hetzel DJS, Taylor JF (1989) Genetic and environmental effects on the fertility of beef cattle in a tropical environment. Australian Journal of Agricultural Research 40, 1085–1097.

MacLeod ND, Ash AJ, McIvor JG (2004) An economic assessment of the impact of grazing land condition on livestock performance in tropical grasslands. The Rangeland Journal 26, 49–71.
CrossRef |

Mayer DG, Pepper PM, Belward JA, Burrage K, Swain AJ (1996) Simulated annealing – A robust optimization technique for fitting nonlinear regression models. In ‘Proceedings – Modelling, simulation and optimization conference’, 6–9 May 1996, Gold Coast. (International Association of Science and Technology for Development, IASTED).

Mayer DG, Belward JA, Burrage K (1998) Optimizing simulation models of agricultural systems. Annals of Operations Research 82, 219–231.
CrossRef |

McCullagh P, Nelder JA (1989) ‘Generalized linear models.’ 2nd edn. (Chapman and Hall: London)

McKeon GM, Day KA, Howden SM, Mott JJ, Orr DM, Scattini WJ, Weston EJ (1990) Northern Australian savannas: management for pastoral production. Journal of Biogeography 17, 355–372.
CrossRef |

NRC (1996) ‘Nutrient requirements of beef cattle.’ 7th edn. (National Academy Press: Washington, DC)

O’Rourke PK (1994) Models for productivity of Bos Indicus cows in north Australia. PhD Thesis, James Cook University, Townsville, Qld.

O’Rourke PK, Entwistle KW, Arman C, Esdale CR, Burns BM (1991) Fetal development and getsational changes in Bos taurus and Bos indicus genotypes in the tropics. Theriogenology 36, 839–853.
CrossRef | CAS |

O’Rourke PK, Esdale CR, Howitt CJ, Rudder TH (1992) Productivity of Hereford, highgrade Simmental and Belmont Red beef herds in central Queensland. 3. Explanatory models for pregnancy rate. Australian Journal of Experimental Agriculture 32, 563–568.
CrossRef |

Pratchett D, Young S (1989) Weaning Kimberley cattle pays off. Western Australian Journal of Agriculture 30, 56–57.

Savage DB, Gaughan JB, Murray PJ, Lisle AT, Peatling SR (2004) Effect of breeder body condition and weight on pregnancy and calf growth in three age groups of composite-bred beef cattle. Proceedings of the Australian Society of Animal Production 25, 156–159.

Schlink AC, Carpenter M, Brown A (1994a) Productivity of a Bos indicus cross cattle herd in the western gulf region of the Northern Territory. Proceedings of the Australian Society of Animal Production 20, 93–96.

Schlink AC, Houston EM, Entwistle KW (1994b) Impact of long-term early weaning on the productivity of Bos Indicus cross cows. Proceedings of the Australian Society of Animal Production 20, 339

Silvey MW, Haydock KP (1978) A note on live-weight adjustment for pregnancy in cows. Animal Production 27, 113–116.
CrossRef |

Sullivan RM, O’Rourke PK, Robertson DJ, Cooke D (1992) Effects of once-yearly weaning on some aspects of herd productivity in an extensive herd in the semi-arid tropics of northern Australia. Australian Journal of Experimental Agriculture 32, 149–156.
CrossRef |

Taylor StCS (1965) A relation between mature weight and time taken to mature in mammals. Animal Production 7, 203–220.
CrossRef |

Taylor StCS (1968) Time taken to mature in relation to mature weight for sexes, strains and species of domesticated mammals and birds. Animal Production 10, 157–169.
CrossRef |


   
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