Neonatal Lamb Hypothermia: Prevention and Emergency Response

Hypothermia in newborn lambs is one of the most common welfare emergencies in sheep farming, preventable through good management and reversible with prompt treatment if caught early.

Key Facts

Lambs are born with limited energy reserves and poor insulation; they depend on colostrum-derived energy and rapid dry coat condition to maintain body temperature.
Hypothermia occurs when heat loss exceeds heat production; risk factors include cold, wet, windy conditions, large litter size, delayed colostrum intake, low birth weight, and difficult birth.
Three categories are used clinically: mild (alert but shivering, rectal temperature 37-39°C), moderate (lethargic but can swallow, 30-37°C), and severe (unconscious, below 30°C).
Severe hypothermia with blood glucose below 2 mmol/L (from concurrent starvation) requires intraperitoneal glucose before external warming — warming alone in hypoglycemic lambs is fatal.
Warming methods include heat lamps, warm water baths (37-40°C for 15-30 minutes), and warm dry rooms; oral or stomach-tube colostrum provides essential energy.
Lambs recovered from hypothermia often have compromised immunity if colostrum intake was delayed; they require careful monitoring for subsequent disease.
Survey data suggests 15-30% of lamb mortality is attributed to hypothermia and starvation, making this the leading cause of preventable lamb deaths on most farms.

Welfare Considerations

Neonatal lamb hypothermia causes suffering that worsens with severity and duration. Mildly hypothermic lambs are conscious but cold and distressed, struggling to maintain posture and making persistent calling vocalizations. Moderately hypothermic lambs become progressively obtunded — the blunting of consciousness that hypothermia causes removes the most obvious behavioral indicators of distress while leaving the underlying physiological crisis. Severe hypothermia approaches unconsciousness — the lamb cannot respond to its environment and faces imminent death without intervention. The rapid reversibility of mild and moderate cases with appropriate treatment makes recognition and prompt response the critical welfare intervention. The combination of hypothermia with hypoglycemia from starvation creates a compounded emergency that is fatal if the glucose-first protocol is not followed.

What You Can Do

Learn to recognize the three severity categories of lamb hypothermia and respond appropriately to each.
Always check blood glucose in lambs with moderate or severe hypothermia before external warming.
Have a warming box, stomach tube, lamb colostrum, and glucose solution available at lambing.
Ensure all lambs receive adequate colostrum within 2 hours of birth as the primary prevention strategy.
Monitor lambs closely for the first 24 hours, particularly in cold, wet, or windy conditions.