Hi OM, for me, the compelling reason to be vegan is because of the extreme distress caused to cows in the production of dairy. This from The Guardian:
"A mother cow only produces milk when she gets pregnant. So, starting from the age of 15 months, she will usually be artificially inseminated. Farmers mechanically draw semen from a bull, and then force the female cow into a narrow trap, known as a “cattle crush”, where they will brutally impregnate her.
Dairy is proving to be a vulnerable spot for the entire slaughter racket
When she gives birth, her calf will typically be removed within 36 hours, so the farmers can steal and sell you the milk that is meant for her baby. Wildlife experts say that a strong bond between cow and calf is formed quickly after birth. Following that callous separation, the mother will bellow and scream for days, wondering where her baby is. The answer depends on the gender of the calf. If male, he will probably either be shot and tossed into a bin, or sold to be raised for veal, which delays his death by just a matter of months. But if the calf is female, she will usually be prepared for her own entry into dairy production, where she will face the same cycle of hell that her mother is trapped in: forced impregnation, the theft of her baby, and a return to the cattle crush two or three months later.
For at least six months of the year, she will often be confined inside dark sheds. But a growing number of dairy farms in Britain use a “zero-grazing system” in which cows spend their entire lives indoors, in increasingly intensive structures.
Although growth hormones are banned in the UK and antibiotic use is limited, a dairy cow can be given reproductive hormones and prescribed antibiotics by a vet to ensure she is kept in a condition to produce an unnatural amount of milk. Under normal circumstances, she would generally only have a maximum of two litres of milk in her udder at any one time, but rapacious farmers may force her to carry 20 litres or more. Her udder becomes so heavy that it makes her lame and she often develops an agonising infection called mastitis. The strain this puts on her body means she is exhausted by the age of five. Soon, her milk yield will no longer be considered profitable. Or she might simply collapse under the agony of it all. Either way, she will be dragged off by a tractor, squeezed into a cramped truck, and driven to the slaughterhouse, to be killed and turned into burgers or baby food. Her throat slit after five sad and torturous years – under natural circumstances she could have lived to 25."
Just reading that and pasting it in makes me ashamed to not be vegan.