Pain Assessment in Cattle: Tools and Application

Pain Assessment in Cattle: Science and Practice

Accurate pain assessment in cattle is fundamental to welfare-oriented veterinary practice and farm management. Unlike companion animals, cattle are prey species that mask pain as a survival strategy, making recognition challenging. The development and validation of cattle pain assessment tools has transformed the ability to identify and treat pain effectively.

Why Pain Assessment Matters

Unrecognised and untreated pain causes suffering, reduces production, impairs immunity, and compromises welfare. Research consistently demonstrates that farmers and veterinarians underestimate pain severity in cattle — recognising as little as 25% of significant pain in some studies. Validated pain assessment tools improve recognition, consistency, and treatment decision-making.

The Bovine Grimace Scale

The Bovine Grimace Scale (BGS), validated by Gleerup et al. (2015), assesses facial expressions as indicators of pain. Five facial action units are scored 0-2 (0=absent, 1=moderately present, 2=obviously present):

• Eyes — orbital tightening and eyelid closure
• Ears — forward rotation or backward position
• Muscles of the face — tension of muscles around the mouth and muzzle
• Face profile — altered facial expression from relaxed baseline
• Attention — reduced attention to surroundings

The BGS can be applied from photographs or direct observation. It has been validated for pain associated with dehorning, lameness, and mastitis, with good inter-rater reliability after brief training.

Composite Pain Scales

The UNESP-Botucatu Multidimensional Composite Pain Scale for cattle (CBPS-Bovine) and similar instruments combine behavioural, postural, and physiological indicators for comprehensive pain assessment. These scales provide total pain scores enabling monitoring of analgesic treatment response over time.

Behavioural Indicators

Beyond facial expressions, pain indicators include: altered gait and weight-bearing, abnormal posture (hunching, head lowering), reduced movement and reluctance to rise, reduced feed intake, isolation from herd, altered response to approach, and attention to pain site. Training farm staff to recognise these subtle signs improves on-farm pain detection.

Technology-Assisted Assessment

Computer vision systems trained on the Bovine Grimace Scale can automate pain assessment from camera footage in cattle housing. Accelerometer-based systems detect changes in lying behaviour, activity, and rumination that correlate with pain states. These technologies have the potential to provide continuous, objective pain monitoring at scale.

Analgesic Use in Practice

NSAIDs remain the primary analgesic class for cattle, with meloxicam, ketoprofen, and flunixin all having evidence of efficacy for different pain types. Local anaesthesia for disbudding, castration, and surgical procedures is essential for welfare. Pain assessment scores should guide treatment initiation and continuation — treating until scores return to normal rather than treating for a fixed time period.

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