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Heat treatment and dehulling effects on feed value of faba beans (OK-Net Ecofeed Practice abstract)

{Tool} Heat treatment and dehulling effects on feed value of faba beans (OK-Net Ecofeed Practice abstract). Creator(s): Alford, Jerry. Issuing Organisation(s): Soil Association. OK-Net Ecofeed Practice abstract. (2021)

[thumbnail of Heat treatment and dehulling effects on feed value of faba beans] PDF - English (Heat treatment and dehulling effects on feed value of faba beans)


Reducing antinutritional factors would allow a higher inclusion of pulses in feed rations. Adding a simple treat-ment would increase feed inclusion, product value and reduce the need for imported protein. High tannin bean varieties are already used for human consumption and ruminants. TIA and tannin removal make them better suited to monogastric diets and would improve markets for all bean varieties.
• Samples of Beans were heated to 150oC for 15 minutes in a conventional electric oven (Picture 1).
• Beans were also dehulled manually and through separation from the bulk sample (picture 2) and were sent to an independent laboratory for analysis (Sciantec, UK)
In order to assess benefits for monogastrics, analysis included Crude Protein, Trypsin Inhibitor activity and ami-no-acid make-up of the untreated, heat treated and dehulled beans.
• The test showed that dehulling increased crude protein by 6.66% but increased TIA by 112.5%
• Toasting increased Protein content by 2% but reduced TIA by 37% (pictures 3 and 4)
The test has shown that dehulling can increase protein content but doesn’t reduce trypsin inhibitor activity, but heat treating does, combining the two has the potential to allow increased inclusions of beans into rations. Nei-ther treatment affects amino acid contents.
• Tannins are the antinutritional factors that are most detrimental to pig nutrition.
• Current recommendations are for inclusions of up to 10% beans in sow rations and up to 20% for growing and fattening pigs, although up to 30% has been used successfully where low tannin varieties are used.
• For poultry, TIA is more detrimental than tannins though both are important.
• Inclusion rates of 5-7% beans are common in poultry rations but where beans are processed (heated, de-hulled, extruded or pelleted) to increase their digestibility it is possible to increase inclusion up to 25%.
Faba beans need to be rolled or milled prior to being fed so additional processes can be added into the handling system. Processes such as micronizing (infra-red heating) and steaming are practised but are not practical on an on-farm situation. Heat treating equipment, such as augers fitted with heating elements, are common in USA and Europe for toasting whole soya beans. These systems could be employed with on farm mills in the UK with stored, untreated beans being processed prior to milling.
Dehulling Equipment is available for other grains and can be adapted for beans.
Note: conventional batch or continuous flow grain driers do not increase temperature sufficiently to affect tryp-sin inhibitor activity.

EPrint Type:Practice tool
What problem does the tool address?:Beans are commonly grown in rotation as a fertility-building cash crop, but they contain antinutritional factors, which limit their inclusion in monogastric rations. Processing the beans to remove antinutritional factors could increase the use and value of a product which is readily available in organic farming.
What solution does the tool offer?:Toasting and dehulling beans reduce the levels of antinutritional factors. Toasting beans reduces the level of trypsin inhibitors. Dehulling reduces the tannin levels.
Country:United Kingdom of Great Britain and Northern Ireland
Type of Practice Tool:Practice abstracts
Keywords:pigs, broilers, layers, feeding, ration planning, processing, handling of harvested feed
Agrovoc keywords:
animal husbandry
broiler chickens
layer chickens
faba beans
Subjects: Animal husbandry > Feeding and growth
Animal husbandry > Production systems > Pigs
Animal husbandry > Production systems > Poultry
Research affiliation: European Union > Horizon 2020 > OK-Net EcoFeed
European Union > Horizon 2020 > OK-Net EcoFeed > OK-Net Ecofeed Tools
UK > Soil Association
Horizon Europe or H2020 Grant Agreement Number:773911
Related Links:https://organic-farmknowledge.org/tool/39516, https://www.facebook.com/organicfarmknowledge/posts/230381358874506, https://twitter.com/farm_knowledge/status/1380163253570056209
Project ID:ofk
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:39516
Deposited On:30 Mar 2021 11:35
Last Modified:16 Feb 2022 12:30
Document Language:English

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