Dingo baiting did not reduce foetal/calf loss in beef cattle in northern South Australia

Campbell, Greg and Coffey, Andrew and Miller, Heather and Read, John L. and Brook, Anthony and Fleming, Peter J. S. and Bird, Peter and Eldridge, Steve and Allen, Benjamin L. (2019) Dingo baiting did not reduce foetal/calf loss in beef cattle in northern South Australia. Animal Production Science, 59 (2). pp. 319-330. ISSN 1836-0939

Abstract

Beef cattle production is the major agricultural pursuit in the arid rangelands of Australia. Dingo predation is often considered a significant threat to production in rangeland beef herds, but there is a need for improved understanding of the effects of dingo baiting on reproductive wastage. We experimentally compared fetal/calf loss on baited and non-baited treatment areas within three northern South Australian beef herds over a 2–4-year period. At re-musters, lactation was used to determine the outcomes of known pregnancies. Potential explanatory factors for fetal/calf loss (dingo baiting, dingo activity, summer heat, cow age, seasonal conditions, activity of dingo prey and selected livestock diseases) were investigated. From 3145 tracked pregnancies, fetal/calf loss averaged 18.6%, with no overall significant effect of baiting. Fetal/calf loss averaged 27.3% for primiparous (first pregnancy) heifers and 16.8% for multiparous (2nd or later calf) cows. On average, dingo activity indices were 59.3% lower in baited treatments than in controls, although background site differences in habitat, weather and previous dingo control could have contributed to these lower indices. The overall scale and timing of fetal/calf loss was not correlated with dingo activity, time of year, a satellite-derived measure of landscape greenness (normalised difference vegetation index), or activity of alternative dingo prey. Limited blood testing suggested that successful pregnancy outcomes, especially in primiparous heifers, may have been reduced by the livestock diseases pestivirus and leptospirosis. The percentage occurrence of cattle hair in dingo scats was higher when seasonal conditions were poorer and alternative prey less common, but lack of association between fetal/calf loss and normalised difference vegetation index suggests that carrion feeding, rather than calf predation, was the more likely cause. Nevertheless, during the fair to excellent prevailing seasons, there were direct observations of calf predation. It is likely that ground baiting, as applied, was ineffective in protecting calves, or that site effects, variable cow age and disease confounded our results.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 13 Feb 2019 04:55
Last Modified: 13 Jun 2019 06:12
Uncontrolled Keywords: dingo, wild dog, beef cattle, predation, 1080 baiting, lethal control, livestock production, predator control, rangelands
Fields of Research : 07 Agricultural and Veterinary Sciences > 0702 Animal Production > 070201 Animal Breeding
05 Environmental Sciences > 0502 Environmental Science and Management > 050211 Wildlife and Habitat Management
Socio-Economic Objective: D Environment > 96 Environment > 9604 Control of Pests, Diseases and Exotic Species > 960405 Control of Pests, Diseases and Exotic Species at Regional or Larger Scales
B Economic Development > 83 Animal Production and Animal Primary Products > 8303 Livestock Raising > 830301 Beef Cattle
Identification Number or DOI: 10.1071/AN17008
URI: http://eprints.usq.edu.au/id/eprint/35341

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