Question: What's a non-religious reason to avoid dairy?
About the article "Dairy product", section "Avoidance of Dairy Products".

Candidate passages:
Some groups avoid dairy products for non-health related reasons:
Religious - Some religions restrict or do not allow for the consumption of dairy products.
For example, some scholars of Jainism advocate not consuming any dairy products because dairy is perceived to involve violence against cows.
Strict Judaism requires that meat and dairy products not be served at the same meal, served or cooked in the same utensils, or stored together, as prescribed in .
Ethical - Veganism is the avoidance of all animal products, including dairy products, most often due to the ethics regarding how dairy products are produced.
The ethical reasons for avoiding dairy include how dairy is produced, how the animals are handled, and the environmental effect of dairy production.
What's up may refer to: "What's Up?"
(musical), a Lerner and Loewe musical "What's Up?"
(song), a song by 4 Non Blondes What's Up!, a Swedish boyband "What'z Up?
", a 1994 TV show  
 and allergies.
Those allergic to dairy foods may find items labeled as "pareve" to be dairy-free, though this is not always the case.
"Kashrut" has procedures by which equipment can be cleaned of its previous non-kosher use, but that might be inadequate for those with allergies, vegetarians, or adherents to other religious statutes.
For example, dairy manufacturing equipment can be cleaned well enough that the rabbis grant "pareve" status to products manufactured with it.
Nevertheless, someone with a strong allergic sensitivity to dairy products might still react to the dairy residue, and that is why some products that are legitimately pareve carry "milk" warnings. 
Cattle only produce milk after calving, and so every dairy cow must produce a calf every year.
In dairy herds (which in the British Isles are almost all Holstein-Friesians), the best milking cows will normally be bred to a dairy bull, usually by artificial insemination (AI).
The female purebred dairy calves from these matings will go on to become replacement dairy cows.
Half of the purebred calves will, of course, be male – these are mostly not needed for breeding, and are generally unsuitable for beef; they may be reared for veal or are killed and disposed of at a few days old, depending on economics.
Purebred dairy calves are not needed from the rest of the herd, and a beef bull is run with the remaining females to produce crossbred calves suitable for beef – these females will be the poorer-quality cows, the heifers (first-time calvers), and any of the other cows which have not settled (become pregnant) successfully by a bull.
The beef bull in this system may be of almost any beef breed, but the Hereford is one of the most widely used – one reason for its popularity is that the white face from the Hereford makes it very easy to avoid confusion between the crossbred and purebred calves at birth. 
A vegetarian diet is one which excludes meat.
Vegetarians also avoid food containing by-products of animal slaughter, such as animal-derived rennet and gelatin.
Lacto vegetarianism: A vegetarian diet that includes certain types of dairy, but excludes eggs and foods which contain animal rennet.
A common diet among followers of several religions, including Hinduism and Jainism, based on the principle of Ahimsa (non-harming).
Lacto-ovo vegetarianism: A vegetarian diet that includes eggs and dairy.
Vegan diet: In addition to the requirements of a vegetarian diet, vegans do not eat food produced by animals, such as eggs, dairy products, or honey.