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Grunts from pigs express their feelings


Pigs’ emotions can now be decoded. An multinational team of academics is the first in the world to convert pig grunts into true emotions across a wide range of situations and life stages, using thousands of acoustic recordings collected throughout the lives of pigs, from birth to death. The University of Copenhagen, ETH Zurich, and France’s National Study Institute for Agriculture, Food, and Environment (INRAE) are leading the research, which might be used to enhance animal welfare in the future.

Is it true that a pig’s grunt is worth a thousand words? That’s possible. Pig grunts were translated into emotions by an international team of researchers from Denmark, Switzerland, France, Germany, Norway, and the Czech Republic in a new study. The results were published in Scientific Reports today.

The researchers developed an algorithm that can determine if a pig is feeling a positive emotion (‘happy’ or ‘excited’), a negative emotion (‘scared’ or’stressed’), or anything in between, using over 7000 audio recordings of pigs. The recordings were made in a variety of conditions that commercial pigs face, both happy and bad, from the time they are born until the time they die.

“With this research, we show that animal noises may reveal a lot about their feelings. We also show that an algorithm can be used to decode and interpret pig emotions, which is a significant step toward improving livestock welfare “According to Associate Professor Elodie Briefer of the University of Copenhagen’s Department of Biology, who co-led the research.

Short grunts are referred to be “happy” grunts

The researchers recorded pig noises in both commercial and experimental settings, which are either connected with a good or negative mood depending on the pigs’ behavior. Piglets suckle from their moms in positive conditions, such as when they are reunited with their families after being separated. Separation, piglet fights, castration, and killing were among the emotionally distressing scenarios.

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The researchers also devised numerous pretend circumstances for the pigs in the experimental stables, with the goal of eliciting more complex emotions in the center of the spectrum. There was a play area with toys or food, as well as a play area with no stimulus. The pigs were also given new and unexpected things to engage with in the arena by the researchers. The pigs’ cries, behavior, and heartrates were all observed and recorded along the route.

The researchers then went through the over 7000 audio recordings to see whether there was a pattern in the noises as a function of the emotions, and if they could tell the good from the bad events and feelings. In unpleasant scenarios, the researchers captured more high-frequency sounds (such as yells and squeals), as previously demonstrated in earlier studies. Low-frequency noises (such as barks and grunts) were also heard in instances when the pigs were experiencing both happy and negative emotions.

Particularly fascinating were the circumstances that existed between the extremes. With a more in-depth examination of the sound data, the researchers discovered a new pattern that offered even more information about what the pigs went through in certain scenarios.

“When we examine at good and negative conditions, there are noticeable changes in pig calls. The calls are much shorter in positive conditions, with modest loudness changes. Grunts, in particular, start out loud and progressively go quieter. We can correctly categorize 92 percent of the calls by training an algorithm to distinguish these noises “”Motion,” Elodie Briefer reveals.

Animal emotions may be monitored by farmers.

Animal emotion research is a relatively recent topic that has emerged in the past 20 years. It is now well understood that livestock’s mental health is critical to their overall well-being. Nonetheless, today’s animal welfare is mostly concerned with livestock’s physical well-being. Indeed, for a farmer, there are various technologies that can automatically check an animal’s physical condition.

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Similar techniques to monitor animal mental health have yet to be created. The study’s authors anticipate that their algorithm will pave the way for a new platform that will allow farmers to monitor their animals’ psychological well-being.

“The algorithm has been taught to decode pig grunting. Now, we need someone to turn the algorithm into an app that farmers can use to enhance their animals’ wellbeing “Elodie Briefer agrees.

She goes on to say that if enough data is collected to train the system, it might be utilized to better comprehend the emotions of other animals.


From birth through death, the researchers captured 7414 noises from 411 pigs in various settings.

To determine whether pig calls are a result of good or negative emotions, a machine learning system was developed.

Pigs’ emotions were described by the researchers based on how they naturally respond to good and negative external stimuli, as well as whether such stimuli may benefit (positive) or endanger (negative) their survival.

Pigs with negative emotions, for example, remain immobile, make a lot of vocalizations, and attempt to flee, while pleasant feelings involve exploring their environment and having their ears forward.

Huddling with littermates, breastfeeding, positive conditioning, enrichment, reunion with the mother, and freely running were all examples of favorable settings. Missed breastfeeding, brief social isolation, piglet fighting, piglet crushing by the mother, castration, and handling and waiting at the butcher were all examples of negative conditions.

The study included sixteen researchers from Denmark, Switzerland, France, Germany, Norway, and the Czech Republic.

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