Farmers urged to act as magnesium levels in grazing ewes fall

SHEEP farmers across Pembrokeshire are being warned of an increased risk of magnesium deficiency in lactating ewes this spring, following months of heavy winter rainfall.

The condition, known as grass tetany, can lead to reduced milk production and poor lamb performance if not addressed early.

Dr Alison Bond, Technical Services Manager at Rumenco, said wet conditions over the winter are likely to have depleted key minerals in grazing land.

She said: “Excessive rainfall can leach magnesium from soils, meaning levels in spring grass may be lower than usual. At the same time, fast-growing grass can dilute mineral content, increasing the risk of deficiency.”

Typical spring grazing may not provide enough magnesium to meet a ewe’s needs. A lactating ewe requires around 4g per day, but grass alone often supplies only half that amount.

Dr Bond warned that even before obvious symptoms appear, flocks may already be suffering hidden losses.

She said: “Reduced feed intake, lower milk yield, loss of condition and increased disease risk can all occur. By the time clinical signs are visible, the impact on productivity is already significant.”

Other seasonal factors, including late frosts and fertiliser use, can further limit magnesium uptake in grass.

Farmers are being advised to take preventative action by providing supplementary magnesium during high-risk periods.

Dr Bond said: “Routine supplementation is the most effective strategy. It helps prevent both sub-clinical losses and more serious cases of grass tetany.”

Magnesium can be provided through mineral blocks or buckets, which allow free access for grazing animals and require minimal labour.

With lambing season underway, farmers are being urged to monitor flocks closely and ensure nutritional needs are being met to protect both ewe health and lamb growth.

AS GLOBAL demand for sustainable textiles continues to grow, wool is presenting farmers with a renewed opportunity to increase revenue by improving flock quality.

Competition shearer and sheep farmer Matt Smith has been working for several years to enhance the value of wool from his Romney flock. However, he believes it could take another decade before he achieves the level of fleece quality needed to deliver a significant uplift in returns.

“We have invested heavily in genetics, particularly to improve micron density within the flock,” he said. “High-quality wool is in demand for premium, sustainable clothing, and better micron density combined with a higher comfort factor will always attract stronger prices.”

While his flock already produces wool that commands a good return, Smith believes there is further potential—particularly with the introduction of new technology that allows more precise measurement of wool quality.

“I have been fortunate to trial a new handheld device from Woven Optics, which measures micron and comfort factor in real time,” he explained. “It has allowed me to clearly see how breeding decisions are influencing wool quality.”

Developed in Australia, the Woven Optics device is designed for use in a range of conditions and has proven to be an accurate on-farm testing tool. In the UK, the company has partnered with Heiniger to bring the technology to farmers.

“I have been working with Hefin Rowlands from Heiniger to monitor our Romneys using the device,” Smith added. “While it represents a significant investment, it is small compared to what we already spend on genetics.”

He believes the technology offers farmers a practical way to track improvements and better understand how breeding choices impact wool value.

“It is an enabler,” he said. “Having the ability to test wool on farm in seconds could help shift the industry back towards prioritising wool as a key genetic trait.”

Smith argues that this shift is not just about profitability, but also about animal health and long-term sustainability.

“In recent years, breeding has focused heavily on carcass weight to meet market demand for larger cuts of meat, and wool quality has been overlooked,” he said. “That has had unintended consequences.”

Drawing on his experience as a contract shearer across the UK, Smith has observed a decline in fleece quality in many flocks.

“I am seeing more yellowing in fleeces and a stronger odour, which can increase susceptibility to fly problems,” he said.

He warns that neglecting wool quality may also be contributing to a growing reliance on chemicals, antibiotics and anthelmintics—raising concerns about resistance and animal welfare.

“As a sheep breeding nation, we risk forgetting how important wool quality is to overall sheep health,” he added. “Changes in fleece condition, combined with warmer temperatures, can increase flystrike risk. By breeding for better wool, we can reduce these issues and cut reliance on pharmaceuticals.”

Smith believes that embracing technology such as the Woven Optics device could help reverse current trends.

“Breeding in the wrong direction is not sustainable,” he said. “By improving wool quality, farmers can produce healthier, more valuable sheep. The tools are now available, and the opportunity is there to restore wool as a priority within UK sheep farming.”

A CALL to allow a Pembrokeshire farm to keep a storage facility for more than 200 caravans, boats, cars and farm machines as a form of diversification has been submitted to county planners.

In an application to Pembrokeshire County Council, Mr & Mrs Davies, through agent A.D Architectural Design Consultants Ltd, seek retrospective permission for a farm diversification scheme to accommodate the storage of caravans, boats, cars and farm machinery in four of eight agricultural sheds and on hard-standing concrete courtyards at Froghall Farm, Spittal.

The works were completed back in 2019.

A supporting statement accompanying the application said: “At present, four of the eight shed structures on the site form part of the caravan and boat storage scheme, with additional touring caravans stored externally on the concrete courtyards.”

It said the storage provision was split as follows: Shed 1 – farm workshop, and 30 caravans, motorhomes, boats & cars; shed 2 – 16 caravans; shed 3 – 28 caravans, motorhomes, boats & cars – 28; shed 8 – cubicle shed, 11 units of farm machines, motorhomes & caravans; courtyard storage of 120 touring caravans, for an overall storage of 205 units.

The statement added: “It would take place in an accessible location, would incorporate sustainable transport and accessibility principles and would not result in a detrimental impact on highway safety or in traffic exceeding the capacity of the highway network; access road is a no-through road with no increase in traffic due to the nature of development.

“There won’t be a constant stream/flow of traffic as the site’s used for storage. Our client offers a towing service to sites in and around Pembrokeshire, which is used by 45 per cent of their customers, who are unable or prefer not to tow themselves. This gives our client control over the flow of traffic.”

The application will be considered by county planners at a later date.