Metabolic peri-parturient ewe diseases Flashcards
When does hypocalcaemia typically occur in sheep?
Late gestation
6 weeks pre-lambing
Give examples of risk factors for hypocalcaemia
Stress Acidosis Cereal diet Older ewes Lush growing pastures
A pregnant ewe presents bloated, with dilated pupils, constipation and recumbency. What is your most likely diagnosis?
Hypocalcaemia
How is hypocalcaemia treated?
Calcium borogluconate IV
When does hypomagnesaemia/staggers usually occur?
Post-lambing - peak lactation
Give 2 examples of risk factors for hypomagnesaemia
Lush grass or bare pastures
Peak lactation
Hypomagnesaemia is diagnosed if magnesia is below 0.6mmol/l. What is the treatment?
Calcium borogluconate IV
Magnesium sulphate SC
NEVER GIVE MAGNESIUM IV
How are hypocalcaemia and hypomagnesaemia prevented?
Hypocalcaemia - low Ca cake
Hypomagnesaemia - high Mg cake
What is pregnancy toxaemia in sheep and when does it occur?
Ketosis, ‘Twin lamb disease’
Late gestation
How are blood glucose and ketones affected by pregnancy toxaemia?
Hypoglycaemia
Hyperketonaemia
Name some risk factors for pregnancy toxaemia/twin lamb disease in sheep
Thin or fat ewes
Stress
Broken mouth
Poor nutrition
How is pregnancy toxaemia diagnosed?
Blood BOHB >3mmol/l
Pregnancy toxaemia may present with inappetance, tremors, recumbency, dead foetuses, blindness or even death. What is the prognosis for pregnancy toxaemia?
Poor - often fatal unless early treatment
Hypoglycaemia causes brain damage
What is the treatment for pregnancy toxaemia in sheep?
Separate and give highly palatable feed
IV glucose or dextrose
Propylene glycol PO
Should you give dexamethasone for pregnancy toxaemia in sheep?
No - causes abortion
Only if intending to PTS and remove lambs
