Ovo vegetarianism // is a type of vegetarianism which allows for the consumption of eggs but not dairy products, in contrast with lacto vegetarianism. Those who practice ovo vegetarianism are called ovo-vegetarians. "Ovo" comes from the Latin word for egg.
Ethical motivations for excluding dairy products are based on issues with the industrial practices behind the production of milk. Concerns include the practice of keeping a cow constantly pregnant in order for her to lactate and the slaughter of unwanted male calves. Other concerns include the standard practice of separating the mother from her calf and denying the calf its natural source of milk. This contrasts with the industrial practices surrounding egg-laying hens, which produce eggs for human consumption without being fertilized. Ovo-vegetarians often prefer free-range eggs, that is, those produced by uncaged hens. Many ovo-vegetarians refuse to eat fertilized eggs, with balut being an extreme example where the egg has developed.
Ethical concerns about the consumption of eggs arise from the practice of culling male chicks shortly after birth. Practices considered humane for chick culling include maceration and suffocation using carbon dioxide.
One of the main differences between a vegan and an ovo-vegetarian diet is the avoidance of eggs. Vegans do not consume eggs under any circumstances. In battery cage egg production, unwanted male chicks are culled or discarded at birth during the process of securing a further generation of egg-laying hens.
- The Dairy Cow from the website of the Vegan Society
- Hens & Eggs from the website of the Vegan Society
- Day 20: Hard Boiled, Deviled & Devastated, a January 26, 2008 blog post from a Loma Linda University Adventist Health Sciences Center blog
- "Maceration" (PDF). AVMA Guidelines on Euthanasia. American Veterinary Medical Association. June 2007. Archived from the original (dead link) on 2011-08-15.
A review of the use of commercially available macerators for euthanasia of chicks, poults, and pipped eggs indicates that death by maceration in day-old poultry occurs immediately with minimal pain and distress. Maceration is an alternative to the use of carbon dioxide for euthanasia of day-old poultry. Maceration is believed to be equivalent to cervical dislocation and cranial compression as to time element, and is considered to be an acceptable means of euthanasia for newly hatched poultry by the Federation of Animal Science Societies, Agriculture Canada, World Organization for Animal Health (OIE), and European Union.
- Erik Marcus (2000). Vegan: The New Ethics of Eating. ISBN 9781590133446.
- Vegetarian Society. "Egg Production & Welfare".
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