Inside the Dairy Industry

Dairy is often treated as the "benign" animal product — no slaughter required, just milk. The reality is considerably more complex. Here's what happens inside the global dairy industry.

Why cows produce milk

This basic point is often overlooked: cows, like all mammals, produce milk to feed their young. A cow does not produce milk automatically — she produces it in response to pregnancy and birth. To keep a dairy cow in continuous milk production, she must be kept continuously pregnant.

The cycle of dairy production

1. Impregnation — dairy cows are artificially inseminated every 12–13 months to maintain milk production. Natural conception is rarely used in industrial systems.
2. Gestation — pregnancy lasts approximately 9 months.
3. Calving and separation — within hours of birth, calves are removed from their mothers. This process causes documented distress in both mother and calf. Cows have been observed calling for their calves for days after separation.
4. Milk production — the cow enters her lactation period. Modern dairy cows produce 6,000–12,000 litres per year — 10× more than a traditional farmyard cow.
5. Re-impregnation — the cow is impregnated again, and the cycle repeats.
6. Culling — after approximately 5–6 years (3–4 lactation cycles), milk yields decline and the cow is sent to slaughter. Her natural lifespan is 20 years.

Dairy cows are not "not killed" — they are slaughtered at a fraction of their natural lifespan. And every glass of milk requires the annual removal of her calf.

What happens to calves

Dairy produces approximately equal numbers of male and female calves. Female calves may replace their mothers in the dairy herd. Male calves:

• Are killed within a few days of birth in some systems (shot or gassed — considered "economically unviable" in some countries)
• Are sold to the veal industry — typically raised in individual pens with restricted movement and slaughtered at 16–20 weeks
• May be raised for beef in beef-dairy crossbred systems

The welfare issues

• Mastitis — infection of the udder, extremely common in high- yield dairy cows due to intensive milking. A significant welfare and antibiotic use issue.
• Lameness — up to 25% of dairy cows in some herds suffer from lameness, often related to concrete flooring, overgrown hooves, or metabolic issues from high-production diets.
• Metabolic disease — high-yield cows frequently experience ketosis, milk fever, and other metabolic disorders due to the physiological stress of extreme milk production.

The environmental picture

Dairy is responsible for approximately 3.4% of global greenhouse gas emissions — comparable to aviation. Per litre of milk:

• 3.2 kg CO₂e greenhouse gas emissions
• 628 litres of water
• 9 m² of land

Oat milk, by comparison, produces 0.9 kg CO₂e, uses 48 litres of water, and requires 0.76 m² of land per litre — roughly 3–4× lower environmental impact across every metric.

The alternatives

Plant-based dairy alternatives have improved significantly. Oat milk is now the best-selling alternative in the UK and US. For cooking, plant milks (oat, soy, coconut) work in virtually all recipes. For cheese, the gap is narrowing. For yogurt, coconut and soy-based versions are widely available.