Dystocia — difficult or obstructed birth — is a major welfare emergency in sheep, causing significant suffering for ewes and lambs and representing a leading cause of perinatal lamb mortality. Effective dystocia management requires skill, prompt action, and appropriate pain management.
Dystocia in sheep results from: malpresentation (lamb not in normal diving position — head on forelimbs), oversized lambs relative to ewe pelvic diameter, ringwomb (failure of the cervix to dilate), uterine inertia (failure of uterine contractions), twins or triplets in complex positions, and fetal death with gaseous distension. Breed differences are significant — breeds selected for heavy musculature (Texel, Beltex) have higher dystocia rates. First-time lambing hoggets (yearling ewes) are at higher risk than mature ewes.
Prolonged dystocia causes: intense pain from sustained uterine contractions against an obstruction, exhaustion, dehydration, tissue trauma (vaginal and cervical lacerations, uterine rupture), systemic illness from prolonged straining, and in severe cases, death. Every hour of delay in assistance increases welfare harm and reduces survival prospects for ewe and lamb. The ability to recognise prolonged labour and intervene promptly is the most critical lambing skill.
Lambs experience: hypoxia (oxygen deprivation) from prolonged birth canal compression, physical injury from extraction (fractures, joint damage, nerve damage), meconium aspiration, and hypothermia. Hypoxic lambs that survive birth require intensive resuscitation and warming. Even lambs that appear normal after difficult births may have brain damage affecting suckling ability and bonding, requiring additional monitoring and support.
Lambing assistance requires: hygiene (clean hands or gloves, lubrication), systematic assessment of presentation and position, correction of malpresentation (repelling the lamb to create space for repositioning), and controlled, traction-synchronised delivery. Excessive force causes ewe and lamb injury. When vaginal delivery is not possible (ringwomb, large lamb, dead emphysematous lamb), caesarean section is the welfare option. Veterinary assistance should be sought promptly when progress is not being made.
Pain relief is essential during and after dystocia interventions. NSAIDs administered at the time of assistance and repeated post-partum significantly improve ewe welfare and recovery. Epidural anaesthesia (lidocaine administered in the sacrococcygeal space) provides excellent analgesia and reduces straining, improving conditions for difficult deliveries. Oxytocin may be used to stimulate uterine contractions in cases of uterine inertia but must be used with caution when delivery is obstructed.
After assisted delivery, ewes require: monitoring for vaginal prolapse (increased risk following dystocia), treatment for retained fetal membranes, antibiotic treatment if significant trauma or contamination occurred, anti-inflammatory pain relief, supportive nutrition and hydration, and observation of ewe-lamb bonding (trauma may impair normal bonding behaviour). Individual lambing records enable identification of ewes with repeated dystocia for culling decisions.