India’s dairy policy apparatus was built for a stable climate. That assumption is now cracking under 38°C heat and monsoon humidity above 70%, according to a study published in Scientific Reports. The data covers 1,148 villages in Haryana across 15 years, from 2004 to 2019.
It tracked 35.56 million buffaloes, 4.66 million cross-bred cattle, and 2.86 million indigenous cattle. The finding is blunt: high temperatures and humidity during July and August “significantly reduce milk production.” Winter temperatures had negligible effect.
The trans-Gangetic plains of northwest India are the nation’s high milk production tract. Haryana sits at its center. India is the world’s largest milk producer.
So a yield drop here isn’t a local problem — it reaches every consumer who buys milk daily. Yet no national policy currently accounts for this seasonal, climate-driven slump.
That gap is what the study’s authors are effectively pointing at, even if they don’t say it in so many words. Buffaloes dominate Haryana’s dairy herds. They are particularly vulnerable.
The combination of extreme heat and high humidity creates physiological strain that acutely undermines dairy production across the global south. The study identified evapotranspiration in May and June as an important factor, alongside the temperature-humidity index. Solar radiation, ambient temperature, and vapour pressure were all part of the climate assessments.
These are not abstract variables. They are measurable conditions that now regularly hit the plains every summer monsoon.
The policy question is straightforward. India’s dairy sector operates on production targets, procurement prices, and subsidized feed. None of those mechanisms adjust for a July heat wave.
A farmer whose buffaloes yield 30 percent less milk for two months still faces the same costs — veterinary care, fodder, water, labor. The study’s data suggests this is not a one-off anomaly.
It is a recurring pattern across more than a decade. If the climate continues to warm, the pattern will intensify. What would a policy response look like?
It could involve adjusting procurement schedules to account for seasonal drops, rather than penalizing farmers for lower summer output. It could mean investing in cooling infrastructure — shade structures, misting systems, ventilation — specifically for the July-August window. It could mean breeding programs that prioritize heat-tolerant buffalo strains.
None of these are radical ideas. They are standard adaptations in other climate-vulnerable agricultural sectors.
But dairy policy in India has not yet made that shift. The study examined 35.56 million buffaloes. That is a lot of animals.
It is also a lot of political weight. The dairy cooperatives that buy milk from farmers are powerful institutions.
They set prices. They set quality standards. They could also set seasonal adjustment factors.
They have not done so yet. The study’s authors did not name specific policy failures. They did not need to.
The data does that work for them. Haryana’s farmers are not waiting for policy.
They are already dealing with the consequences. But individual coping strategies — selling off animals, switching to less productive but hardier breeds, reducing herd size — are not a national solution. The trans-Gangetic plains produce a huge share of India’s milk.
If production drops there, the shortfall ripples through the entire supply chain. Urban consumers in Delhi, Mumbai, and Kolkata will see it in prices.
Rural consumers in Haryana itself will see it in availability. The study covered 1,148 villages. That is a lot of villages.
It is also a lot of votes. Indian agricultural policy responds to political pressure. The question is whether the pressure will arrive before the next July heat wave, or after it has already cut production again.
The science is clear. The policy is not.
That is the gap this study leaves for officials to fill.
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