Crocodile Farming Research: Hatching to Harvest
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Crocodile Farming Research: Hatching to Harvest A report for the Rural Industries Research and Development Corporation by SKJ Peucker, BM Davis and Dr RJ van Barneveld September 2005 RIRDC Publication No 05/152 RIRDC Project No DAQ-287A © 2005 Rural Industries Research and Development Corporation. All rights reserved. ISBN 1 74151 215 8 ISSN 1440-6845 Crocodile Farming Research: Hatching to Harvest Publication No. 05/152 Project No. DAQ-287A The information contained in this publication is intended for general use to assist public knowledge and discussion and to help improve the development of sustainable industries. The information should not be relied upon for the purpose of a particular matter. Specialist and/or appropriate legal advice should be obtained before any action or decision is taken on the basis of any material in this document. The Commonwealth of Australia, Rural Industries Research and Development Corporation, the authors or contributors do not assume liability of any kind whatsoever resulting from any person's use or reliance upon the content of this document. This publication is copyright. However, RIRDC encourages wide dissemination of its research, providing the Corporation is clearly acknowledged. For any other enquiries concerning reproduction, contact the Publications Manager on phone 02 6272 3186. Researcher Contact Details Steve Peucker Department of Primary Industries and Fisheries PO Box 1085 TOWNSVILLE QLD 4810 Phone: 07 4722 2608 Fax: 07 4778 2970 Email: [email protected] In submitting this report, the researcher has agreed to RIRDC publishing this material in its edited form. RIRDC Contact Details Rural Industries Research and Development Corporation Level 1, AMA House 42 Macquarie Street BARTON ACT 2600 PO Box 4776 KINGSTON ACT 2604 Phone: 02 6272 4819 Fax: 02 6272 5877 Email: [email protected]. Website: http://www.rirdc.gov.au Published in September 2005 Printed on environmentally friendly paper by Canprint ii Foreword The primary objective of this broad based crocodile research and development program is to assist with the profitability and sustainability of commercial crocodile production in Australia. The program addresses industry priorities such as pelleted feed, husbandry practices and industry economics. The development of manufactured feed for crocodiles is the main focus of the research program. Traditionally, crocodiles are fed on diets of red meat, poultry or poultry by-products such as chicken heads or necks. Fresh meat contains large amounts of water, which in itself is a cost to farmers. The feed necessitates the use of large freezers for storage. Transport and handling can be difficult and expensive. Manufactured feed should reduce the feed costs associated with growing crocodiles by improving the supply of nutrients, the efficient of nutrients and reducing the cost of diets. Crocprofit was developed in response to enquiries, by people interested in investigating establishment of or investment in crocodile farming. Crocprofit is an information package developed to assist producers and potential investors. The program is based on the cost-benefit analysis technique. It allows people to evaluate the economics of crocodile farming by using their own input parameters before any establishment or investment occurs. Part of the research program deals with crocodile diseases. Observational studies have been carried out on the bacterial and fungal contamination of farmed Johnstone River crocodile eggs. The report presents some interesting results and forms a framework that should be repeated on the more commercially orientated estuarine crocodile where its value would have a greater impact. The second phase of the electrical stunning equipment project is reported. This aspect deals with the animal welfare issue and effects of using this equipment on crocodiles. In a trial comparing the capture of crocodiles using electrical stunning and the traditional noose and pole method the former proved less stressful to the animals and also to the people doing the capturing. This project was funded from RIRDC Core Funds which are provided by the Australian Government. This report, an addition to RIRDC’s diverse range of over 1500 research publications, forms part of our New Animal Products R&D program, which aims to accelerate the development of viable new animal industries. Most of our publications are available for viewing, downloading or purchasing online through our website: • downloads at www.rirdc.gov.au/fullreports/index.html • purchases at www.rirdc.gov.au/eshop Peter O’Brien Managing Director Rural Industries Research and Development Corporation iii Acknowledgments Organisational support is imperative for the successful delivery of crocodile research and development outcomes. Central to this support is the Queensland Department of Primary Industries and Fisheries (DPI&F) which is responsible for having financed the very fine, environmentally controlled crocodile research facility at Townsville. RIRDC is thanked for its operational financing of the project. Australia’s commercial crocodile industry is thanked for its contribution of animals for research purposes. The Crocodile Nutrition Group (CNG) is thanked for its participation, advice, and encouragement for the manufactured feed research/development program. Several individuals have made a special contribution to the crocodile R&D program and include: • Dr Peter McInnes from RIRDC • Rob Jack, Lyndell Morrissy and Bill Johnston from DPI&F • Ian Graham, Electrical Contractor, Tolga • Dr Craig Franklin, University of Queensland • John and Lillian Lever and staff from Koorana Crocodile Farm • Peter Fisher and David Wilson, Melaleuca Crocodile Farm • Beth Symonds, Dr David Booth and Dr Leigh Ward, University of Queensland • Dr Annette Thomas DPI&F Presenting research outcomes to producers at distant locations such as the Northern Territory is difficult. The R&D group have been assisted in this task, by the Northern Territory’s Department of Primary Industry and Fisheries (NTDPI&F). A special thanks is extended to Vicki Simlesa who assisted with the organisation and delivery of manufactured feed for on-farm trials in the Northern Territory. The following people are thanked for their contribution to the research report: • Bob Mayer from DPI&F for statistical analysis • Honor Stephenson for editing and proof reading. iv Contents Foreword..............................................................................................................................................III Acknowledgments................................................................................................................................IV Executive Summary ............................................................................................................................VI 1. Introduction ...................................................................................................................................... 1 Crocodile Farming in Australia: 2002-2005........................................................................................ 1 The 2002-2005 Crocodile Research Program ..................................................................................... 1 2. Objectives.......................................................................................................................................... 3 3. Methodology ..................................................................................................................................... 4 4. Nutrition............................................................................................................................................ 5 Background ......................................................................................................................................... 5 Response of growing crocodiles to increasing levels of dietary fat and the inclusion of the dietary additive kaolin..................................................................................................................................... 6 The influence of dietary Kaolin and Sodium Bentonite on the growth and feed conversion efficiency of growing crocodiles......................................................................................................... 8 The development of feeding frequency strategies for grower crocodiles............................................ 9 Newly hatched crocodiles and their initiation and response to manufactured feeds......................... 14 Weaning trial to determine the effect of using fresh blood on feed intake of manufactured diet to hatchling Crocodylus porosus........................................................................................................... 18 2004 Hatchling weaning trial comparing a control and a rapid weaning strategy. ........................... 21 The influence of lupin inclusion on the digestibility of manufactured diets for Crocodylus porosus24 Measuring body condition in farmed crocodiles using Bioelectrical Impedance Analysis............... 31 5. Disease ............................................................................................................................................. 33 Observations on freshwater crocodile (Crocodylus johnstoni) eggs collected from two farms in northern Queensland.......................................................................................................................... 33 6. Capture...........................................................................................................................................