Ewes grazing cereal crops are at risk of metabolic disorders caused by mineral deficiencies, such as hypocalcaemia.
This risk can be significantly reduced if the correct supplements are provided, MLA-funded research has revealed.
The research confirmed that grazing dual-purpose and spring varieties of wheat, barley and oats can lead to metabolic disorders in reproducing ewes, due to the lower-than-required levels of calcium (Ca), magnesium (Mg) and sodium (Na) and higher-than-tolerable level of potassium (K).
However, Dr David Masters, a livestock systems scientist working on the project with Murdoch University, Charles Sturt University and the NSW Department of Primary Industries, said the traditional industry supplement of lime/salt/causmag (40:20:40) could improve the mineral status of reproducing ewes. Research continues on the development of an even more effective targeted supplement that will further reduce risk.
While research is ongoing, David said the key messages to producers were:
- a high proportion of grazed crops have forage Ca, Na and Mg content below ewe requirements and K content above tolerable levels
- reproducing ewes grazing wheat, and possibly oats and barley, are at risk of metabolic disorders
- Ca deficiencies in reproducing ewes can be reduced by feeding a lime/salt/causmag supplement.
The research team found ewes grazing wheat were most at risk of deficiencies and, while risks with barley or oats appear lower, further investigation is still needed.
https://www.mla.com.au/news-and-events/industry-news/managing-mineral-deficiencies/