Research Overview: The Schulze Study (1978)
Title of the Study:
Versuche zur Objektivierung von Schmerz und Bewusstsein bei der konventionellen und rituellen Tiertötung von Schaf und Kalb
(Attempts to Objectify Pain and Consciousness in Conventional and Ritual Methods of Slaughtering Sheep and Calves).
Lead Researchers:
Prof. Dr. Wilhelm Schulze: Director of the School of Veterinary Medicine Hannover (TiHo).
Dr. Hazim: Co-researcher.
Dr. Gross: Co-researcher.
Date:
Published in 1978 by Deutsche Tierärztliche Wochenschrift (German Veterinary Weekly).
- Methodology
The primary goal of the study was to use scientific instrumentation to measure physiological responses to pain and loss of consciousness, rather than relying solely on visual observation.
- Subjects: The study used a sample size of 17 sheep and 15 calves.
- Instrumentation: To ensure accurate readings without the stress of immediate restraint affecting the results, electrodes were surgically implanted into the skulls of the animals several weeks prior to the experiment. This allowed the animals to recover and behave normally before the slaughter process.
- Measurement: The researchers used an Electroencephalograph (EEG) to record brain activity and an Electrocardiograph (ECG) to monitor heart activity.
- Groups:
- Ritual Slaughter (Halal/Shechita): A swift, deep incision of the throat (severing the jugular veins and carotid arteries) without prior stunning.
- Conventional Slaughter (Captive Bolt Stunning – CBS): The use of a captive bolt pistol to stun the animal prior to bloodletting.
- Findings Reported by Schulze
The study yielded specific comparative data between the two methods.
A. Ritual Slaughter (The Cut)
-
- Immediate Reaction: The study reported that immediately following the incision, there was no significant change in the EEG graph for a brief period, which Schulze interpreted as the incision being felt as a tactile sensation rather than acute pain.
- Loss of Consciousness:
- Sheep: The EEG showed a “zero line” (indicating a cessation of cortical brain activity) within 4 to 6 seconds.
- Calves: The EEG reached the zero line within 10 seconds.
- Conclusion on Pain: Schulze concluded that because the loss of brain activity occurred so rapidly, the animals did not register pain before losing consciousness. The “missing defensive actions” (struggling) were attributed to a lack of pain rather than physical restraint.
B. Captive Bolt Stunning (CBS)
-
- Immediate Reaction: Upon impact of the captive bolt, the EEG readings showed a drastic spike.
- Pain Interpretation: The study noted that while the animals were technically “stunned,” the EEG displayed severe variations consistent with pain or massive sensory shock immediately following the bolt impact.
- Heart Activity: In some cases, the heart stopped beating earlier than in the ritual method, but the brain activity (and potential pain reception) persisted longer than in the ritual cut group.
- The Study’s Conclusion
Professor Schulze and his colleagues summarized their findings with the statement often cited by religious advocacy groups:
“The slaughter in the form of a ritual cut is, if carried out properly, painless in sheep and calves according to EEG recordings and the missing defensive actions.”
Conversely, regarding the conventional method, they stated:
“For sheep, there were in part severe reactions both in bloodletting cut and the pain stimuli when captive bolt stunning was used.”
- Impact on Law and Society
The “Schächturteil” (2002)
The most significant application of this research occurred decades later in the German legal system.
- Context: In January 2002, the German Federal Constitutional Court (Bundesverfassungsgericht) ruled on a case regarding the legality of Islamic butchery (Dhabiha) without stunning.
- Citation: The Court referenced the 1978 Schulze study as evidence that ritual slaughter could be performed humanely. This scientific evidence was crucial in the Court’s decision to grant an exemption to animal protection laws in favor of religious freedom (Article 4 of the Basic Law), allowing Muslim butchers to obtain licenses for slaughter without stunning.
Current Context & Academic Stance
It is important to note, for the sake of neutrality and completeness:
- University Stance: The University of Veterinary Medicine Hannover (TiHo) has since stated that the 1978 study reflects the technology and scientific understanding of that time. Modern veterinary consensus and newer studies often argue that the “zero line” on an EEG from 1978 may not equate to total loss of sensation and that pre-slaughter stunning is generally preferred by veterinary bodies today.
- Schulze’s Later View: In his later years, Prof. Schulze reportedly emphasized that the ritual cut requires extreme skill to be painless and often advocated for proper restraint and training if it were to be practiced.
Citations
- Primary Source:
Schulze, W., Schultze-Petzold, H., Hazim, A. S., & Gross, R. (1978). Versuche zur Objektivierung von Schmerz und Bewusstsein bei der konventionellen und rituellen Tiertötung von Schaf und Kalb [Attempts to objectify pain and consciousness in conventional and ritual methods of slaughtering sheep and calves]. Deutsche Tierärztliche Wochenschrift, 85(2), 62–66. - Legal Citation:
Bundesverfassungsgericht (Federal Constitutional Court of Germany). (2002). Judgment of 15 January 2002 – 1 BvR 1783/99 (The “Schächturteil”). - Institutional Reference:
University of Veterinary Medicine Hannover (TiHo). Statement regarding the 1978 Schulze Study. (Available in university archives regarding the history of the Institute for Food Quality and Food Safety).