Conditions when likely to occur:

Late pregnant cows in last six weeks of pregnancy grazing dry poor quality pasture (<1,000โ€“1,500kg DM/ha), stubbles or green pasture less than 800kg DM/ha. Either cows over fat score 3 or light cows on very poor pasture.

Clinical signs: pregnancy, animal recumbent, and neurological signs such as staggering, aggression, delirium. Often associated disease process.

Management strategy to prevent disease:

Avoid grazing cows on pasture where rapid weight loss is likely in late pregnancy, or supplement to avoid rapid weight loss.

Avoid getting cows too fat (>FS3.5โ€“4) or too thin (<FS2โ€“2.5) in late pregnancy.