Effect of Stocking Density and Crate Height on the Welfare of Fattening Rabbits During Transport to the Slaughterhouse under Mediterranean Autumn Conditions
This study found that under Mediterranean autumn transport conditions, increasing crate height and reducing stocking density to meet EFSA recommendations provided no detectable welfare benefits for fattening rabbits, as neither factor significantly influenced their thermophysiological, metabolic, or behavioral responses.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Every year, millions of rabbits raised for food are moved from farms to slaughterhouses, a journey that involves catching, crating, loading onto trucks, and traveling for several hours. For decades, animal welfare experts have debated how much space these animals need during that trip. The prevailing idea, supported by European food safety authorities, is that rabbits need more room to lie down comfortably and enough height to sit up without their ears touching the ceiling. The logic is that if they are cramped, they cannot move or cool themselves properly, leading to stress and suffering. However, until recently, these rules were based mostly on mathematical calculations of how much space a rabbit should need, rather than on what actually happens when they are packed into crates and driven down the road.
A team of researchers in Spain decided to test these assumptions in the real world. They wanted to see if giving rabbits more floor space and taller crates actually made a difference to their well-being during a typical autumn transport. They set up an experiment using commercial trucks carrying rabbits that weighed between 2.0 and 2.5 kilograms. They created different scenarios: some crates were packed with many rabbits, representing the tightest commercial practice, while others held fewer rabbits to match the recommended guidelines. They also modified some crates to be twice as tall as the standard ones, allowing the animals to stand up if they chose to. Over the course of two transport trips, the researchers monitored the rabbits closely, measuring their behavior, body temperature, and stress levels from the moment they were caught until they arrived at the slaughterhouse.
The journey itself revealed a surprising reality about the environment inside the truck. Even though the weather outside was cool, with temperatures ranging from 3 to 11 degrees Celsius, the air inside the crates was often much warmer, reaching up to 29 degrees in some spots. The conditions were not the same everywhere; the front of the truck was often hotter and noisier than the back, and the air moved differently depending on where the crate was stacked. Despite these variations, the rabbits behaved in a remarkably consistent way. When the truck was moving, the vast majority of them simply lay still, doing almost nothing. They did not pace, jump, or try to explore the extra space. Even in the taller crates where they could have stood up with their ears fully extended, they rarely did so. The few times they did sit up, it was only before the truck started moving; once the journey began, they stayed low and compact, regardless of how much room they had.
The physical toll of the trip was also measured, and the results showed that the extra space did not change the outcome. The rabbits lost an average of 75 grams of body weight, mostly due to dehydration and the stress of being without food and water. Their body temperatures dropped slightly, and about 13 percent of them became too cold by the time they arrived, a condition known as hypothermia. However, this happened equally in the crowded crates and the spacious ones. The researchers also checked the rabbits' blood for signs of stress, muscle damage, or energy depletion. They found no difference between the groups. Whether a rabbit was in a tight crate or a roomy one, its body reacted to the journey in the same way. The location of the crate within the truck mattered more than the size of the crate itself; rabbits in the front of the vehicle, which experienced more vibration and airflow, showed slightly different stress responses than those in the back, but the amount of space available did not alter their physiology.
The study concludes that, under the conditions of this autumn transport, simply giving rabbits more floor space or taller crates did not improve their welfare. The animals did not use the extra room to move around or stand up, and their bodies did not show signs of being less stressed or healthier. This suggests that the current recommendations, which are based on theoretical calculations of space, may not reflect how rabbits actually behave or feel during transport. The researchers found that the environment inside the truck—specifically the temperature, airflow, and vibration—played a much larger role in how the rabbits coped than the dimensions of their crate. While the study does not prove that space is never important, it indicates that for this specific type of journey, increasing the size of the crate alone is not enough to solve the welfare challenges rabbits face. The focus, the authors suggest, should shift toward understanding and managing the actual conditions the animals experience inside the vehicle, rather than relying solely on the size of the container they are in.
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