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Electrical stunning of sheep.

¹Institute for Animal Husbandry 'Schoonoord', Driebergseweg, 10 D Zeist, The Netherlands.

|November 8, 2011

Summary

This study determined optimal electrical stunning parameters for Texel sheep, finding 0.33 A effectively stuns 90% of animals. For improved animal welfare, a minimum of 0.5 A (160 V) is recommended before throat cutting within 16 seconds.

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Area of Science:

Veterinary Science
Animal Welfare
Neurology

Background:

Electrical stunning is a common method for rendering livestock insensible to pain before slaughter.
Optimizing electrical stunning parameters is crucial for ensuring animal welfare and meat quality.
Previous research has not definitively established the most effective electrical parameters for sheep stunning.

Purpose of the Study:

To determine the optimal electrical current and voltage for effective stunning of Texel breed sheep.
To evaluate the impact of different electrical parameters on the induction and duration of epileptiform insults.
To provide evidence-based recommendations for improving electrical stunning practices in sheep for animal welfare.

Main Methods:

Implantation of electrocorticogram (ECoG) electrodes in seventy Texel sheep (approx. 43 kg live weight).
Application of various electrical currents and voltages using scissor model tongs for stunning.
Statistical analysis to estimate the current strength required for 90% effective stunning and assessment of insult duration.
Monitoring for paroxysmal ventricular tachycardia post-stunning.

Main Results:

A current strength of 0.33 A was statistically estimated to effectively stun 90% of sheep, inducing immediate epileptiform insults.
The duration of epileptiform insults was significantly longer with 600 V compared to 300 V (shortest durations 23 s and 22 s, respectively).
Paroxysmal ventricular tachycardia was consistently observed in all sheep after stunning.

Conclusions:

Electrical stunning of sheep requires a minimum amperage of 0.5 A (160 V) for effective stunning and induction of epileptiform insults.
Throat cutting should be performed within 16 seconds following electrical stunning to ensure animal welfare.
These findings provide critical data for refining electrical stunning protocols in sheep production.

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