You might think that every cow in a herd is the same, but a UBC study suggests some cows are sadder than others.
Animal welfare researchers trained a group of 22 calves to expect that a bottle placed in a hole on one side of the room would contain milk, while one placed on the opposite side would only blow a puff of air into the calvessa国际传媒� muzzles.
Then, the researches placed a bottle in a hole between the sa国际传媒榞oodsa国际传媒� and sa国际传媒榖adsa国际传媒� bottles and watched to see which calves were willing to try and see if it had milk.
The researchers believed that the most optimistic calves would approach the new bottle even if it was placed near the empty bottle, while the pessimistic cows would avoid it in fear of getting the puff of air.
They found that although the calves all had different responses, each individual calf consistently made the same choice to either try or avoid the new bottle.
The calves varied in their responses, but individual calves remained consistent and made similar choices even three weeks apart. Researchers concluded that pessimism was a consistent individual trait, not just the result of temporary moods or emotions.
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sa国际传媒淪ometimes we are tempted to see only the herd, even though this herd consists of different individuals who cope differently with stressful events,sa国际传媒� said PhD candidate Marina von Keyserlingk.
sa国际传媒淚tsa国际传媒檚 important to consider the individualsa国际传媒檚 perspective, because even if conditions are good on average, some animals may still suffer.sa国际传媒�
Pessimistic cows were also more scared overall, the study suggests.
sa国际传媒淐alves that were more fearful were also more likely to view the glass as half empty,sa国际传媒� said von Keyserlingk.
The team will go on to study how farmers can ensure even the sad cows have happy lives.
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