@buffalobill90 Said There isn't anything wrong with discriminating on the grounds of species. Doing so on the grounds of skin colour or gender is immoral and illogical, since there are no relevant differences between people with different skin colours or genders with regards to moral treatment. On the other hand, the differences between certain species is entirely relevant. Hens, unlike humans, have no sophisticated social structure, and hence do not require powerful brains in order to process conscious thoughts and feelings. They are not self-aware, since they don't need to be in order to survive well. Therefore, they are incapable of suffering, since they do not experience conscious sensations of pain or emotion.
Wow. We may have hoped that Cartesian views were a thing of the past. Your view of nonhuman experiences is remarkably dated. In relation to hens, for example:
Some poultry scientists and other poultry industry representatives say opposition to debeaking is based "more on emotion than research." In fact, debeaking was fully explored by the Brambell Committee, a group of veterinarians and other experts appointed by Parliament to investigate animal welfare concerns arising from intensive farming in the early 1960's. The committee wrote in 1965: "There is no physiological basis for the assertion that the operation is similar to the clipping of human finger nails. Between the horn and bone [of the beak] is a thin layer of highly sensitive soft tissue, resembling the quick of the human nail. The hot knife blade used in debeaking cuts through this complex horn, bone and sensitive tissue causing severe pain."
In 1990, in "Behavioral evidence for persistent pain following partial beak amputation in chickens," published in Applied Animal Behavior Science, Vol. 27, Michael Gentle and his associates at the Institute of Animal Physiology and Genetics Research, Edinburgh, Scotland, showed that experimentally debeaked chickens demonstrated chronic pain and suffering following the operation. Gentle explains: "The avian beak is a complex sensory organ which not only serves to grasp and manipulate food particles prior to ingestion, but is also used to manipulate non-food articles in nesting behavior and exploration, drinking, preening, and as a weapon in defensive and aggressive encounters. To enable the animal to perform this wide range of activities, the beak of the chicken has an extensive nerve supply with numerous mechanoreceptors, thermoreceptors, and nociceptors [ nerve endings sensitive to mechanical pressures, heat and pain]....Beak amputation results in extensive neuromas [tumors] being formed in the healed stump of the beak which give rise to abnormal spontaneous neural activity in the trigeminal [threefold] nerve. The nociceptors present in the beak of the chicken have similar properties to those found in mammalian skin and the neural activity arising from the trigeminal neuromas is similar to that reported in the rat, mouse, cat and the baboon. Therefore, in terms of the peripheral neural activity, partial beak amputation is likely to be a painful procedure leading not only to phantom and stump pain, but also to other characteristics of the hyperpathic syndrome, such as allodynia and hyperalgesia [the stress resulting from, and extreme sensitiveness to, painful stimuli]."
from: https://www.upc-online.org/merchandise/debeak_factsheet.html
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