This is a condition that occurs during late pregnancy and is a direct result from a deficiency in energy. Nearly 80 percent of foetal growth occurs during the last six weeks of gestation. Lush green pastures that often look good, commonly have poor nutritional value, as they are high in water and low in dry matter and nutrients. As such, the ewe is unable to consume enough to meet her energy needs.

Another risk factor for ewes to develop this condition is carrying multiple foetuses. Late gestation energy requirements are roughly 150 percent (ewe with a single lamb) to 200 percent (ewe with twins) above maintenance levels.

Signs to look out for include: ewes separated from the mob that are lethargic, dull and not eating; teeth grinding; nervous system signs, such as tremors, staggering, head pressing, star gazing and blindness; and eventually recumbency for three to four days prior to becoming comatose and then death.

If you notice any of these signs in your ewes then it is essential to increase their energy intake as soon as possible. Drenching with 50mls of propylene glycol morning and night provides a rapidly available energy source. If this is administered early in the course of the disease, it can reverse the condition. The ewe's prognosis is much better if she is still standing when treatment is initiated.

As far as prevention goes, if environmental and flock factors are creating conditions favourable to pregnancy toxaemia, then start the flock on a high-energy ration. Grain or sheep nuts are effective but must be introduced slowly.

Minimise stressful situations, and avoid sudden changes in feed or periods of starvation. Be alert in periods of extreme weather, ensuring ewes receive supplementary feed and shelter. If you have any concerns about your flock please don't hesitate to call us on 4832-1977.