Rural Industries
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RIRDC Completed Projects in 2001-2002 & Research in Progress as at June 2002
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Plant Disease, Weed, Pest and Micro-organism Management
| UQ-82A | Field testing microbial inoculants for hay preservation | Dr. Peter Dart | (07) 3365 2867 | The University of Queensland |
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New Markets and Products
| PTP-14A | Australian Fodder Industry production atlas | Mr Arthur Stubbs | (03) 9844 1135 | Primary Tasks Pty Ltd |
Plant Breeding and Germplasm Evaluation
| SAR-8A | Development of disease resistant, high yielding oat cultivars with enhanced quality for hay production | Dr Pamela Zwer | (08) 8303 9485 | South Australian Research and Development Institute |
Plant Disease, Weed, Pest and Micro-organism Management
| UWA-30A | Sulla and other forage species for southern Australia | Dr Mike Ewing | (08) 9380 1876 | University of Western Australia |
| CSA-3A | Development of a quantitative ELISA for screening fodder for corynetoxins | Dr Khin A Than | (03) 5227 5731 | CSIRO Animal Health |
| UQ-25A | Microbial inoculants for hay | Peter Dart | (07) 365 2867 | University of Queensland |
Quality Standards
| CSJ-1A | Objective specification of the quality of hays & fodder | S Baker, R Dynes, B Purser & D Henry | (08) 9333 6000 | CSIRO Animal Production |
| DAV-104A | Uniform objective system for quality description of Australian fodder products | Peter Flinn | (03) 5573 0900 | Agriculture Victoria |
| DAW-28A | Development of exports of oaten hay to Japan - alternative shipping methods | CPF De Lima & R Nussey | (09) 368 3494 | Department of Agriculture |
| SAR-2A | Establishment of annual ryegrass toxicity (ARGT) testing services and protocols for the Australian export hay industry |
Alan McKay |
(08) 8303 9375 |
South Australian Research & Development Institute |
Industry Communication and Information Flows
| KDI-6A | A publication on fodder systems for Australian farming | M. Evans | (08) 9478 3343 | Kondinin Group |
| DAN-88A | Haymaker – extension technology for lucerne management | Ian Collett | (02) 6763 1100 | NSW Agriculture |
R&D Management Monitoring and Review
| KAK-2A | Assessment of the extent, nature and source of support for a R&D levy for the Australian fodder industry |
Mr Colin Simpson |
(02) 6920 8216 |
Kakadu Pastoral Company P/L |
Other Related Projects
| UQ-23A | An evaluation of the fodder potential of tree legume species | R.C. Gutteridge | (07) 3365 2062 | Department of Agriculture |
Plant Disease, Weed,
Pest and Micro-organism Management
| Project Title: | Field testing microbial inoculants for hay preservation |
| RIRDC Project No: | UQ-82A |
| Researcher: | Dr. Peter Dart |
| Organisation: | The
University of Queensland
School of Land and Food Systems ST. LUCIA QLD 4072 |
| Phone: | (07) 3365 2867 |
| Fax: | (07) 3365 1188 |
| Email: | p.dart@mailbox.uq.edu.au |
| Objectives | Stage
1:
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| Background | Losses of quality on baling of hay can be considerable if hay is preserved too dry because this will induce leaf shatter particularly for lucerne and clover hays. Bailing hay too moist, largely because of variable weather, can lead to spoilage through overheating and fungal contamination and rotting of the hay. Field trials with a microbial inoculant HayRiteTM have shown that it can improve hay quality when hay is baled at elevated moisture levels. The inoculant bacteria produces an antifungal antibiotic. The project has assessed the presence of any antibiotic residues on the hay that, when fed to animals, may result in a change in food intake, metabolism or can subsequently be detected in milk. The method of producing the inoculant for commercial use has been developed and is prepared as a powder. This product has been assessed for field use and has been tested for its efficacy on a range of crops in different locations and seasons. Animal feeding trials for residues in milk were conducted in collaboration with a dairy farmer and the Cobram milk factory that used the lab based Delvotest SP procedure. Other animal trials involving beef cattle and sheep have been conducted at UQ. There was no difference between treated and untreated hay without mould in feed intake, changes in the weight gain, and in the case of sheep, microbial protein production and antifungal antibiotic presence in rumen fluid and blood. |
| Research | Extensive farm field trails have shown that HayRiteTM is effective in halting moulding in a range of hays that are baled at high atmospheric moisture levels and in wheat baled at high sap moisture. The treatment of hay with HayRiteTM fed to animals had no detectable effects on their health or intake. In the case of sheep, the treatment of hay with HayRiteTM at either baling or sprayed onto hay just before feeding had no deleterious effects on the health of either the ewes treated or their lambs born 3-6 weeks after feeding. There were some small beneficial effects of these HayRite on nutritive value and live-weight gains of ewes given HayRiteTM The substantial beneficial effects of treating hay with HayRiteTM during drying may be further enhanced by minor improvements in hay quality and animal performance fed these diets. |
| Outcomes | This
project is in the final stages of developing a commercial inoculant to
be known as HayRiteTM. The product preserves moist hay against
fungal attack to give a superior quality fodder with a higher value in
the market place. Field trials in SE Qld, NSW and in Victoria have shown
that the inoculum is effective in preserving lucerne, sorghum, wheat and
rye grass/clover hay. The inoculum can be stored under refrigeration for
at least a year, it is not corrosive and application is simple using existing
farm spraying equipment. The inoculum is most effective when applied at
mowing. Animal intake is not affected by the inoculum.
Farmer co-operators will test the inoculum again in the 2002 season before its commercial release in 2002/03. |
| Implications | HayRite is a new product for hay preservation with advantages in the field and will be in cost over its competitors on the market in Australia and the rest of the world. Its use gives farmers a flexibility in operation that they desire to overcome the vagaries of the weather. It can be applied using readily available equipment that most farmers will already have. Use of HayRite may also improve hay quality even if weather damage is not an issue, and treated hay should command a price premium. The product will potentially be available for export. |
Completed Projects - prior
to 2001-2002
New Markets and Products
| Project Title: | Australian Fodder Industry Production Atlas |
| RIRDC Project No: | PTP-14A |
| Researcher: | Arthur Stubbs |
| Organisation: | Primary
Tasks Pty Ltd
Unit 58/2, 247-255 Drummond Street CARLTON VIC 3053 |
| Phone: | 03 9844 1135 |
| Fax: | 03 9844 4554 |
| Email: | akstubbs@compuserve.com |
| Objectives |
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| Background | Australian Bureau of Statistics data are currently the prime source of information on the fodder industry in Australia, however, except for export data, they are historical records, provide very limited categorisation and are focussed on total production. There is a general awareness of the major operators and organisations involved in fodder production, trade and servicing, and issues such as quality and prices, but this is usually very localised and has not been collectively documented. Fodder industry meetings since 1994 have agreed that measuring and mapping the industry was an important requirement. |
| Research | Desk research was undertaken to gather current data on fodder production statistics and logistics from national and State rural surveys and statistical databases, followed by communication and interview with key people and organisations involved in the fodder industry. Emphasis was placed on the current major trade supply channels to define the major market areas for immediate application, but also provide information on potential fodder products and areas. |
| Outcomes | An Australian Fodder Production Atlas was prepared giving the latest available information on fodder production by type, quantity, seasonal availability and general quality. The atlas makes reference to the recent background of commercial fodder production in Australia, from the commencement of the export hay trade, to give a historical perspective. In addition, information is provided on the main trade channels, significant operators in the domestic and export markets, fodder markets and prices. A survey procedure is also defined, based on key correspondents and operations, to enable updating of the atlas from time to time, as required. This is based on the AFIA playing a key role in future collection and communication of this information to the industry. |
| Implications | This atlas of fodder production, by type, quantity and quality, will complement recent fodder industry achievements in testing and description standards, and lead to better informed prediction and sourcing of hay supplies for the various domestic and export markets. |
| Publications | Stubbs A.K, Atlas of the Australian Fodder Industry, RIRDC Publication No:00/122 |
| Project Title: | Development of Disease Resistant, High Yielding Oat Cultivars with Enhanced Quality for Hay Production |
| RIRDC Project No: | SAR-8A |
| Researcher: | Pamela Zwer |
| Organisation: | South
Australian Research & Development Institute
GPO Box 397 ADELAIDE SA 5001 |
| Phone: | (08) 8303 9485 |
| Fax: | (08) 8303 9378 |
| Email: | zwer.pamela@saugov.sa.gov.au |
| Objectives |
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| Background | Oaten hay exports to Japan have increased from about 170,000 tonnes in 1997 to almost 400,000 tonnes in 1999. The industry was worth about $110 million in 1999 (delivered to Japan) and with the expansion of the market to 500,000 tonnes would be worth about $183 million for Australia. The continued growth of this industry is dependent on meeting specifications of more discriminating export and domestic markets. Oat varieties with improved characters for fodder performance, are needed by both growers and hay processors. This research program was designed to specifically improve oat varieties for hay end-use. |
| Research | Parental material were evaluated for increased dry matter yield, improved early vigour to compete with weeds, thin to medium stem diameter, plant colour, and a wider range of plant maturites. Disease resistance and forage quality, were also important characters for selection of parental material. Crosses were made with introduced germplasm possessing desirable traits and adapted oat lines developed in the SARDI breeding program. Advanced breeding lines were evaluated in hay trials across South Australia, Victoria, and Western Australia. Disease resistance, agronomic characters, hay yield potential, and forage quality were assessed. Data were summarised and used to identify improved oat varieties for hay end-use. |
| Outcomes | Approximately 60 germplasm introductions were sourced from oat breeding programs and collections worldwide and used to produce 160 single crosses. Early generation material derived from the crosses are in the F2 , F3 , and F4 generations. About 900 F4 plots were sown from lines derived from 1997 single crosses. Stage 4 hay trials consisting of 32 entries were sown at three to four locations in 1998, 1999, and 2000. Stage 5 hay trials, consisting of 12 entries, a subset of the stage 4 trial entries, were sown at 11 sites in 1998, eight sites in 1999, and seven sites in 2000. Agronomic data, disease reactions, and quality evaluations were used to promote the most promising lines to the next year. Two advanced breeding lines, SV88083-4 and SV87103-109, were selected as new variety releases. Commercialisation of SV88083-4 is proceeding. SV93072-43 is being considered for variety release. |
| Implications | New oat variety releases for hay production will be available to growers beginning in 2003. Benefits from the release of improved hay varieties will influence growers, processors, and the customer. The availability of first grade hay with consistent palatability will provide a reliable supply of a quality product for processors to market domestically and overseas. Customers will benefit with a superior performing fodder. |
| Publications | Zwer, P and Hoppo, S Oaten Hay Variety Development, RIRDC Publication No: Forthcoming |
| Project Title | Sulla and other forage species for Southern Australia |
| RIRDC Project No: | UWA 30A |
| Researcher: | Dr Mike Ewing |
| Organisation: | Centre for Legumes in Mediterranean Agriculture |
| Phone: | (08) 9380 1876 |
| Fax: | (08) 93801140 |
| mewing@cyllene.uwa.edu.au | |
| Objectives |
· Work with the fodder
industry to develop and demonstrate the productivity and quality potential
and benefits of new fodder legumes and to identify constraints to their
adoption.
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| Background | Changes
in farmer systems and new technology in the form of new legume cultivars
has stimulated interest in their potential in fodder production and also
the further development of new legumes legume species and cultivars with
potential for use in such systems
. |
| Research | The
project involved a program of activities linking evaluation of plant and
rhizobial genetic resources, evaluation of promising legume species and
cultivars in field experiments and demonstrating legume productivity in
a range of fodder production systems. The field evaluation and demonstrations
were conducted on the farms of fodder producers and covered a wide range
of soils and management systems
. |
| Outcomes | Key
outcomes included:
· The release of Caprera crimson clover and Cefalu arrowleaf clover for use as dual-purpose grazing/fodder plants on well drained soils. · Identification of elite accessions of a group of legumes (and their root nodule bacteria) that, with further testing, and will add to available fodder legume options (eg. sulla Hedysarum coronarium; purple clover). |
| Implications | The project has identified legumes that combine high productivity in fodder production systems, with adaptation to soil and climatic condition prevailing in high rainfall regions where fodder production is concentrated. Producers now have a greatly expanded array of legume options to include in their systems to cover the wide range of environmental conditions which they face and managerial systems that they impose. |
| Publications | Ewing,
M, Poole, C, Skinner, P and Bennett, A, Sulla and Other Forage Species
for Southern Australia, RIRDC Publication No:01/41
Ewing, M. A. (1999). New pasture species. Proc. of the 11th Australian Plant Breeding Conference, eds P. Langridge, A. Barr, G. Auricht, G. Collins, A. Grainger, D. Handford and J. Paull. Vol. 1, pp 86-90, CRC for Molecular Plant Breeding, University of Adelaide Ewing M.A. (1999) Sulla and other forage species for southern Australia., AFISC Conference, August 1999, Adelaide SA |
| Project Title | Development of a quantitative ELISA for screening fodder for corynetoxins |
| RIRDC Project No: | CSA-3A |
| Researcher: | Dr Khin A Than |
| Organisation: | CSIRO
Animal Health
Private Bag 24 (5 Portarlington Road) Geelong Vic 3220 |
| Phone: | (03) 5227 5731 |
| Fax: | (03) 5227 5555 |
| khin.than@dah.csiro.au | |
| Objectives |
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| Background | Hay contaminated with corynetoxins causes ARGT in livestock, a problem found only in Australia. Oaten hay from Australia was responsible for several incidents of ARGT in Japan that led to export restrictions. Current QA of hay uses an ELISA for the bacterial source of the corynetoxins rather than the toxins themselves. While this has so far been successfully in preventing further incidents of poisoning it is an indirect way of ensuring that fodder is safe. Some hay that shows a strong response when assessed by the bacterial assay may be safe for stock. It was therefore considered desirable to establish a method for detecting and measuring the corynetoxins to allow better management of the problem. CSIRO had patented technology that was considered to be suitable for the purpose but this needed to be adapted for specific application to fodder. |
| Research | Antisera against the corynetoxins can be induced in sheep when they are injected with a modified form of the corynetoxins conjugated to a protein. Existing supplies of anti-corynetoxin antisera and newly generated sera where assessed for their suitability for use in a corynetoxin ELISA for application to fodder samples. The conditions for conducting the ELISA where optimised. This involved research into coating microtitre plates with toxin conjugates, selection of assay buffers and assay conditions. The potential for extractives from the fodder to interfere with the assay was also assessed. The solvent for extracting trace levels of toxin present was also selected bearing in mind cost, safety and efficiency. The ELISA was then validated against a confirmatory HPLC assay before it was applied to 110 fodder samples. |
| Outcomes | The assay was shown to be effective for application to fodder samples. It was found to be capable of measuring corynetoxin down to 40 parts per billion. It offers a means of determining the safety of fodder for stock. The corynetoxin ELISA will now need to undergo testing in several laboratories to ensure its usefulness to the fodder industry. An officer from Agriculture WA has been trained in its use. Similar training will be offered to SARDI. Inter-laboratory testing will be conducted by CSIRO to ensure that the ELISA meets acceptable standards for QA of fodder. |
| Implications | Following a period in which to prove its robustness and suitability for routine application to fodder samples, during which some fine tuning is anticipated, it will be available to the fodder Industry for use in assuring the safety of fodder with the potential to cause ARGT. It is expected to enable the fodder industry to better manage the problem of ARGT and to protect the industry from future trade disruptions. The reagents and standards needed for the assay are specialised products and their future availability needs to be established if the assay proves to be important for the fodder industry. |
| Publications | Than
KA, Cao Y, Michalewicz A, Cockrum PA, Olsen V and Edgar JA (1999). Novel
quantitative ELISA for corynetoxins. AFA’99: Society for Food and Agricultural
Immunology’s 5th International Conference:
Agri-Food Antibodies ’99; 1999 Sep 14-1999 Sep 17: Norwich, U.K. 1999 [Abstr.] |
| Project Title | Microbial inoculants for hay |
| RIRDC Project No: | UQ-25A |
| Researcher: | Peter Dart |
| Organisation: | Department
of Agriculture
University of Queensland ST LUCIA QLD 4072 |
| Phone: | (07) 365 2867 |
| Fax: | (07) 365 2965 |
| Objectives |
· To develop suitable inoculant carrier and delivery systems for field use. |
| Background | Spoilable and mycotoxin producing fungi can develop on lucerne plant material during hay making if the water content exceeds 30%. Drying protects plant material from fungal attack but also increases leaf loss from shatter during movement of the material in hay making and baling. Microbial inoculants may prevent growth and development of spoilage fungi, and thus enable baling at higher water content. This would help reduce leaf loss and moulding, the major cause of loss of quality of hay. |
| Research & Outcomes | Extensive
collections of both leaf surface bacteria and spoilage fungi were isolated
from fresh and dried lucerne. Bacterial strains, which affected the growth
of spoilage fungi were selected.
Rifampicin resistant mutants of promising bacterial strains were selected to enable monitoring inoculant populations under field conditions. Inoculant survival on lucerne was studied before cutting, during drying, after cutting and after baling. Preliminary field trials were conducted to test the effects of bacterial strains on the spoilage of baled lucerne and promising results were obtained. Media and fermentation technology are being developed for the production of suitable commercial inoculants. The aim is to achieve high populations in liquid culture. Bio-Care is conducting collaborative trials on inoculant production in their commercial fermentors. |
| Implications | The conserved fodder industry in Australia is valued at about $600 million. It is estimated that 50% of the feeding quality can be lost during hay making. These inoculants would be an Australian development with potential to achieve a world-wide market. |
| Project Title | Objective specification of the quality of hays & fodder |
| RIRDC Project No: | CSJ-1A |
| Researcher: | Sue Baker, Robyn Dynes, Barrie Purser and David Henry |
| Organisation: | CSIRO
Animal Production
Private Mail Bag 5 PO Wembley WA 6913 |
| Phone: | (08) 9333 6000 |
| Fax: | (08) 9387 8991 |
| s.baker@ccmar.csiro,au; r.dynes@ccmar.csiro.au; purser@ccmar.csiro.au; d.henry@ccmar.csiro.au | |
| Objectives |
· To validate predictions against measured animal performance and to compare methods developed in this project with existing methods on the basis of cost, speed and accuracy. |
| Background | The value of hays traded in Australia is about $600M, and of this hay exported mostly to Japan, Korea and Taiwan makes up about 11% of hay traded. Livestock producers understand that differences in hay and fodder quality should be reflected in animal performance. Despite this, prices paid for hays do not reflect likely performance of animals consuming them. The United States has been active in developing and putting in place quality standards for hays, and prices are based upon objectively measured hay quality. Objective, performance-based quality standards that are accepted by the industry will provide a sound basis upon which price differentials can be determined. Objective, performance-based quality standards will also enhance the ability of exporters of hay to capture and retain markets in the face of increasing competition from other exporting countries, particularly the United States. The livestock industries will benefit by an assurance that performance will be related to price paid for hay or fodder. |
| Research | Hay and fodder nutritive value is sometimes confused with hay and fodder quality (also known as feeding value). Nutritive value is determined by digestibility and efficiency of utilisation of nutrients, whereas feeding value is determined by nutritive value and voluntary feed intake. Thus hays and fodders of similar nutritive value can differ substantially in feeding value (quality). Biomechanical characters of hays reflect how difficult the hay is for the animal to chew, and are important in constraining voluntary feed intake by ruminants. Hay quality characters, including biomechanical characters, were evaluated to determine which of them best described the quality of the hays in terms of their feeding value, by feeding 35 cereal hays from 3 growing seasons to sheep. |
| Outcomes | Characters of hay that can be measured in laboratory analyses can be used as predictors of animal performance. The characters that best predict constraint to voluntary feed intake of cereal hays were shear energy (a biomechanical character), neutral-detergent fibre (NDF), and crude protein content. From a prediction of constraint to intake, voluntary feed intake can be predicted with acceptable reliability. It was confirmed that biomechanical characters can be predicted using near infra-red reflectance spectroscopy (NIRS) (patents pending). |
| Implications | Adoption by the Australian hay and fodder industry of quality standards that reflect likely animal performance is important for the competitive of the industry and for customer confidence. Using this approach Australia is gaining an increasing market share it its export markets. |
| Project Title | Development of exports of oaten hay to Japan - alternative shipping methods |
| RIRDC Project No: | DAW-28A |
| Researcher: | Dr CPF De Lima & Mr R Nussey |
| Organisation: | Department
of Agriculture
3 Baron-Hay Court SOUTH PERTH WA 6151 |
| Phone: | (08) 9368 3494 |
| Fax: | (08) 9368 1204 |
| Objectives |
· to investigate the fumigation requirements arising from these alternatives; · to investigate the economics of all stages in the marketing chain from farm gate to Japan; · to assess the market acceptance of the product in Japan. |
| Background | From
1990 to 1993 Western Australia exported, per year, about 40,000 tonnes
of fodder valued at approximately $10 million —around half of the total
exported by Australia. It is conservatively estimated that this amount
could be increased more than five times through improved packing and shipping.
Alternative methods to be studied are: higher density compression and use
of 20' (TEU) containers; and break bulk packing of fodder in units for
shipping on conventional cargo vessels.
Before new packing technologies can be introduced, the economics of all stages of the marketing chain from farm gate to Japan, and acceptance of the changes by the Japanese market, need to be assessed. Also insect fumigation requirements arising from changes in packing and shipping will need to be investigated. |
| Research | Trials
of high-density compression of hay were carried out using facilities of
Independent Wool Dumpers Pty Ltd at Fremantle capable of a maximum compression
force of 250 tonnes. It was shown that 21.6 tonnes of fodder could be packed
into a TEU container. There was some concern that moisture would be released
from hay but after 30 days in plastic there was no evidence of condensation
or mould formation. Moisture condensation was measured and instruments
for analysing it surveyed. Feeding trials demonstrated suitability of the
compressed fodder as cattle food. In a trial shipment of 13 tonnes to Japan
there were no quarantine problems.
Data on insect species infesting oaten hay were gathered. Enough species were found to justify fumigant concentrations used. Gas concentrations and gas-tightness were also measured. An economic analysis of on-farm prices, before-processing costs, after-processing costs, export prices and margins was made. |
| Outcomes | Analysis confirms that shipping costs pose a serious threat to the viability of WA's export-hay industry. While the study shows that it is possible to obtain high densities of fodder in 20' containers, changing to the smaller containers may only result in a minor export increase because the Japanese market appears to prefer 40 ' (FEU) containers. |
| Implications | This study has indicated that a significant increase in exports of WA oaten hay would come only from developing break bulk shipping, but it is noted that support for this has, so far, been extremely disappointing. |
| Publications | De Lima, C.P.F., Emery, R.N. and Jackson, P. 1994. 'Improved procedures for fumigation of oaten hay in shipping containers', Proc. of the 6th International Working Conference on Stored-Product Protection, Vol 1, 7177. CAB International Wallingford UK.. |
| Project Title | A publication on fodder systems for Australian farming |
| RIRDC Project No: | KDI-6A |
| Researcher: | Mr M. Evans |
| Organisation: | Kondinin
Group
177 Great Eastern Highway
Belmont WA 6104 |
| Phone: | (08) 9478 3343 |
| Fax: | (08) 9478 8853 |
| Objectives | To
collect and disseminate information to Australian farmers to assist with
fodder exports by:
· collating information on innovative methods of handling fodder and presenting case studies of the most efficient methods and systems in Australia. |
| Background | There are currently 46,000 properties producing fodder in Australia. The export fodder industry is centred around Western and South Australia and has a huge growth potential for markets in the Asian and Pacific area. Machinery problems are known to be costly in time and to cause a decline in nutritional value of conserved fodder. |
| Research | Methodology
consisted of:
· analysing data and writing reports; · making field visits and collating farm information including machinery modifications, equipment servicing and case studies of innovative fodder producers; and · publishing a manual. |
| Outcomes | A comprehensive manual based on the information gained from the research has been published. The manual titled Cut and Dried: the Complete Guide to Hay & Silage Management provides information on the total fodder production system for farmers across Australia with emphasis on "who is doing what and how they are achieving it". |
| Implications | Many farmers should significantly improve the quality of hay bound for export by taking advantage of equipment modifications and advice contained in Cut and Dried. |
| Publications | Kondinin Group. 1994. Cut and Dried: the Complete Guide to Hay and Silage Management. Kondinin Group, WA. 424 pp. |
| Project Title | An evaluation of the fodder potential of tree legume species |
| RIRDC Project No: | UQ-23A |
| Researcher: | Dr R.C. Gutteridge |
| Organisation: | Department
of Agriculture
University of Queensland QLD 4072 |
| Phone: | (07) 3365 2062 |
| Fax: | (07) 3365 1188 |
| Objectives |
· To undertake grazing studies to determine the liveweight gain potential of the three species for cattle. · To determine appropriate management strategies for the most efficient use of the species. |
| Background | Over
the past ten years increasing interest has been shown in the use of tree
and shrub species as fodder. Some species offer advantages over herbaceous
species in terms of superior persistence, higher yields, better liveweight
potential, ease of management and ability to produce high quality fodder
in periods of stress.
Albizia chinensis and Tipuana tipu are tree legumes which have shown agronomic promise in initial screening trials. They are reported to grow over a wide range of climatic and edaphic conditions. While they have not been widely recognised in Australia, the Queensland Department of Primary Industries have recognised their potential and included them in a regional program of browse species evaluation. They have been shown to be palatable but quantitative assessment of their nutritive value has not been carried out nor have they been evaluated under grazing. |
| Research | There were three major components to the evaluation of these species. The first was a study of their productivity and reaction to grazing in situ, the second was an assessment of their nutritive value in pen feeding studies. A third component was a study of the reaction of Tipuana tipu to a regular defoliation. |
| Outcomes | The
tree legume species when fed in conjunction with signal grass (Bracharia
Decumbens) are capable of producing moderate liveweight gains over
extended periods. Average daily gains of up to 0.60 kg/head/day were achieved
over a 6 month period which included the cool dry season from May to November.
After 10 months grazing the trees did not show any obvious signs of permanent damage due to browsing by the cattle. Plant mortality in the 6 months after transplanting was relatively high for Tipuana but this may have been due to poor adaptation to the rather than a negative affect of grazing. Pen feeding studies demonstrated that goats readily consumed the dried leaf of both Tipuana and Albizia. |
| Implications | These trials have indicated that the three species are useful as fodder resources for ruminant livestock in a sub tropical environment and that further evaluation is warranted to help define their full potential. |
