Chilean study reveals depression symptoms in caged hens

Research led by Dr. Javiera Calderón found that hens in traditional cages display at least two behaviors comparable to clinical depression.

The study, published in the journals Animal Welfare and Applied Animal Behaviour Science, compared caged hens with birds in free environments. Ninety percent of Chile’s laying hens live in traditional cages.

Dr. Calderón, a veterinarian from Universidad de Chile and PhD graduate from UACh, said the results highlight a serious ethical problem. “This speaks to us of a deep welfare issue,” she said.

A second line of the research showed that chickens form positive bonds with humans when treated gently. The findings were disseminated recently.

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Illustration of a woman with depression symptoms overlaid with microscopic view of aging monocytes in blood, linking to study on women with and without HIV.
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Study links monocyte “biological aging” in blood to emotional depression symptoms in women with and without HIV

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A study of 440 participants from the Women’s Interagency HIV Study found that accelerated epigenetic aging in monocytes—an immune cell type—tracked more closely with emotional and cognitive depression symptoms such as hopelessness and loss of pleasure than with physical symptoms like fatigue. The work, published in The Journals of Gerontology: Series A, adds evidence that cell-type-specific aging measures could contribute to future biological tools to complement symptom-based depression screening, though researchers say more validation is needed before clinical use.

A new study of captive parrots provides evidence that the birds sometimes use specific names to refer to particular people or animals. Researchers analyzed hundreds of recordings and found patterns that suggest more than simple mimicry.

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일본 연구팀이 펭귄이 먹이 활동 구역을 찾기 위해 집단 신호에 의존한다는 사실을 발견했다.

A new study from Lund University shows that moonlight is crucial for the migratory bird, the red-necked nightjar. The bird's feeding, migration, and breeding are entirely governed by the moon's cycle. Researchers highlight the vulnerability of nocturnal animals to changes in light environments.

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In Hedemora, Erik has created an extraordinary henhouse featuring secret doors, 18th-century hinges, and an underground tunnel for his eight hens. Originally planned as a playful house for his own use, the project turned into a luxurious hen home due to rising costs. The house resembles Pettson's and is located in a village outside Garpenberg.

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