FARMERS ARE being warned of an increased risk of grass staggers in cattle this spring following a particularly wet winter.
The condition, also known as hypomagnesaemia, is caused by low levels of magnesium in the blood and can have a serious impact on both dairy and beef herds.
According to Rumenco’s Technical Services Manager, Dr Alison Bond, excessive winter rainfall may have leached vital minerals from soils, leaving grazing animals more vulnerable than usual as they move onto spring grass.
She explained that while magnesium deficiency is a common seasonal issue, this year’s conditions could heighten the risk.
“Lush, fast-growing grass can dilute magnesium levels, while factors such as frost or fertiliser use can further reduce uptake,” said Dr Bond.
“In a wet year, the problem is compounded as essential minerals are washed from the soil, increasing the likelihood of deficiency.”
Early signs of the condition can often go unnoticed, with reduced feed intake and milk yield affecting overall performance. In more severe cases, cattle may suffer muscle spasms, collapse, or even death.
Dr Bond stressed that prevention is key, as visible symptoms often indicate that losses have already occurred.
A typical lactating suckler cow requires around 26g of magnesium per day, but spring grass alone may provide only half of that amount.
“Supplementation is essential at this time of year,” she said. “Without it, farmers risk both hidden productivity losses and more serious health issues within the herd.”
She added that free- access mineral buckets and blocks offer a practical and cost-effective solution, allowing cattle to take in the nutrients they need with minimal labour.
“Magnesium deficiency is often an invisible drain on performance,” Dr Bond said. “Making supplementation readily available during high-risk months is one of the most effective ways to protect animal health and productivity.”
