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Farming

Spotlight on ammonia reduction strategies for Welsh poultry producers

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A WELSH study has refocused attention on strategies for reducing ammonia emissions in the poultry sector, with farmers urged to adopt measures including good ventilation and litter and manure management protocols to lower levels.

A three-year European Innovation Partnership (EIP) Wales trial on two broiler farms looked specifically at the role additives may have in reducing emissions by improving gut health and flock performance.

The study produced no evidence that these were effective for this purpose – similar levels of ammonia were recorded in the control and treatment houses.

But project manager Jason Gittins, technical director for livestock at ADAS, says there are a number of other measures that farmers can put in place to tackle emissions.

Ammonia is a component of urea, which is excreted in poultry faeces; when that manure is exposed to air and to moisture, the gas is released.

Agriculture is a major source of ammonia, accounting for 87% of UK emissions in 2019; of this, 14% came from poultry production.

“Ammonia gas is a harmful gas to both poultry and poultry workers and excessive nitrogen deposition resulting from ammonia emissions also damages the environment,’’ warns Mr Gittins.

Here, he gives his advice on how poultry farmers can reduce those emissions.

Ventilation

Poorly ventilated sheds will result in wet litter, which allows more ammonia to be released into the air. The use of effective ventilation to optimise the in-house environment, and preventing condensation can increase litter dry matter content and so reduce ammonia emissions.

Indirect heating systems heat the shed without the additional carbon dioxide and water vapour produced by direct gas heating systems, Mr Gittins explains.

“As a result, litter condition is often drier, which makes conditions less favourable for the production of ammonia,’’ he points out.

Ammonia scrubbing systems

These systems typically pass exhaust air from the house through a liquid to capture the ammonia; the air released to the atmosphere then has a lower ammonia content. Mr Gittins says reports have indicated that reductions in ammonia emissions of around 80% are possible using scrubbing systems, but the capital and operating costs are high.

Correct diet formulation

Diets should be formulated based on amino acid requirements, rather than crude protein, Mr Gittins advises.

“Diet formulation should change throughout the flock cycle to ensure that the nutrient supply is closely matched to the birds’ ammonia acid and other nutrient requirements.’’

Improvements in feed utilisation and feed conversion ratio (FCR) provide both environmental and financial benefits.

Correct removal and storage of soiled bedding

Manures should be contained in covered stores on impermeable surfaces. If field heaps are used, the surface area should be as small as possible: ‘A’ shaped, as this will reduce emissions, says Mr Gittins.

“A key issue is that wet poultry manure and litter can lead to higher emissions of ammonia and so the priority is to keep them as dry as possible, both during housing and afterwards.

“This can also increase its value per tonne as a fertiliser and reduce haulage costs and odour risks.’’

Manure applications should follow normal good practice, he adds.

“This should include avoiding spreading during frost, snow and heavy rain and taking account of soil conditions at the time.

“For liquid organic manures, precision spreading methods are preferable to splash-plate systems.’’

In free-range egg production, the move to multi-tier systems, rather than single-tier, is consistent with reducing ammonia, because of belt clean-out and frequent manure removal.

Preventing puddling around drinkers

Keeping litter dry is key to reducing ammonia levels. Drinkers should be managed to prevent spillages – any leaks need to be identified and quickly resolved.

“Nipple drinker systems should be adopted, as these allow better management of water intake and reduce water wastage,’’ Mr Gittins recommends.

High bird health

Keeping the health status of birds high will help to maintain litter in a drier condition.

“Birds challenged with disease and in poor health often produce wetter manure, which can result in higher ammonia emissions,’’ says Mr Gittins.

EIP Wales, which is delivered by Menter a Busnes, has received funding through the Welsh Government Rural Communities – Rural Development Programme 2014-2020, which is funded by the European Agricultural Fund for Rural Development and the Welsh Government.

 

Farming

Check ewes at weaning to protect next season’s lamb crop

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PEMBROKESHIRE sheep farmers are being urged to use weaning as a key opportunity to check ewe condition and deal with any problems before tupping.

With many local flocks now moving towards weaning, farmers are being advised to assess body condition score, as well as checking teeth, feet and udders, while there is still time to improve nutrition ahead of the breeding season.

Dr Alison Bond, Technical Services Manager at Rumenco, said close monitoring at this stage can help avoid major changes in ewe condition and improve overall flock productivity.

She said weaning at around 12 weeks was a good target, when lambs should usually be between 25kg and 30kg and taking very little milk from the ewe.

“There will of course be a focus on the lambs’ readiness for market at this stage, but it is equally important to put a hand across the ewes to assess their condition,” she said.

For lowland flocks, ewes with a body condition score below 2.5 at weaning should be given priority, as they may struggle to reach the target score of around 3.5 by tupping.

Those poorer condition ewes should be grouped separately, moved onto the best available grazing and given appropriate supplementary feeding where needed.

Dr Bond said waiting until closer to tupping could be less effective and may affect performance.

She added that ewes in good condition at tupping are more likely to scan with more lambs, produce healthier lambs after birth, and rear heavier lambs by eight weeks of age.

“It affects the whole production cycle, and not just one element,” she said.

The advice will be particularly relevant to farms across Pembrokeshire, Carmarthenshire and Ceredigion, where sheep remain a major part of the rural economy and where grass quality can vary sharply depending on weather, soil type and stocking pressure.

Dr Bond said the aim should be to keep ewes between body condition score 2.5 and 3.5 throughout the cycle, avoiding big dips and peaks.

Routine checks at weaning, she said, give farmers the best chance of correcting problems before the tups go in two to three months later.

Pic: Farmers are being urged to check ewe condition at weaning to protect flock performance ahead of tupping (Pic: Tim Scrivener/Agriphoto).

 

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Farming

Reform calls for urgent review of farming scheme

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LOW UPTAKE HAS RAISED FRESH QUESTIONS OVER THE FUTURE OF SUPPORT FOR WELSH FARMERS

REFORM WALES has called for an urgent review of the Sustainable Farming Scheme after figures showed only around half of eligible farmers have signed up.

The party said the lower-than-expected uptake showed that serious concerns remained within the farming community over the complexity of the scheme, compliance rules and uncertainty about how it will operate in the long term.

Laura Anne Jones MS, Reform Wales’ Shadow Cabinet Minister for Food, Farming and Rural Affairs, raised the issue during questions to the Welsh Government.

She said: “The figures released by the Welsh Government today confirm what many farmers have been saying for some time: the Sustainable Farming Scheme is too complex, too restrictive and too bureaucratic.

“Farmers need certainty and security, not endless paperwork and rigid requirements that fail to reflect the realities of farming in Wales.

“Reform Wales believes the scheme should be reviewed as a matter of urgency, with a greater focus on flexibility, common sense and practical outcomes.

“Welsh farmers deserve a scheme that works with them, not against them.”

The Sustainable Farming Scheme is due to replace previous systems of agricultural support in Wales and has been one of the most contentious issues facing the rural sector.

Farming unions and campaigners have repeatedly warned that any new system must be practical for family farms and must not add unnecessary red tape at a time when many businesses are already under pressure from rising costs, bovine TB and market uncertainty.

Reform Wales said the Welsh Government must now explain how it intends to respond to the level of take-up and whether changes will be made before the scheme is fully rolled out.

 

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Business

Holiday accommodation conversion of historic farm buildings approved

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PLANS to convert historic farm buildings near north Pembrokeshire’s Whitesands beach for use as holiday accommodation have been given the go-ahead, but their use doesn’t have to be restricted to just that purpose.

In an application to Pembrokeshire Coast National Park, Matthew James of James Properties, through agent Harries Planning Design Management sought permission for the conversion of two derelict barns to two self-catering holiday accommodation units at Porthmawr Ganol, Whitesands, St Davids.

An officer report said: “The farmstead occupies a prominent position within a landscape characterised by open agricultural fields enclosed predominantly by traditional dry-stone walls, exposed coastal pasture and areas of heathland associated with Carn Llidi.”

It added: “The site lies within the Porthmawr Historic Landscape Character Area, an area recognised for its historic pattern of dispersed settlement, traditional farmsteads, dry-stone wall field boundaries and evidence of medieval and post-medieval agricultural activity.

“The retention and reuse of the existing buildings therefore has the potential to preserve an important element of the area’s historic landscape character whilst securing a viable long-term future for structures that would otherwise continue to deteriorate.”

It said that insufficient evidence had initially been submitted to demonstrate that the buildings were unsuitable for permanent residential conversion and only for self-catering accommodation and therefore an affordable housing contribution should be secured.

Policy would lead to a contribution of £36,400, the report said, but a financial viability assessment by the applicant “demonstrated that the development would not be viable if required to provide the full policy contribution,” the maximum contribution capable of being supported whilst maintaining viability was £12,641.

This reduced figure was accepted, the officer report saying: “Whilst this represents a reduced contribution when compared with the full policy requirement, the submitted viability evidence demonstrates that the development could not reasonably support the full contribution whilst remaining deliverable.

“In these circumstances, securing a reduced contribution is considered preferable to losing the opportunity to secure the restoration and beneficial reuse of the historic buildings.”

It stated that, with the affordable contribution, the scheme would not be limited to self-catering development only.

The application was conditionally approved by Park planners.

 

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