Environmental impacts of Broiler chicken production in the North Eastern Himalayan region of India: Evaluation using the Life Cycle Assessment approach

This study presents the first cradle-to-farm-gate Life Cycle Assessment of broiler chicken production in India's North Eastern Himalayan region, revealing that feed production (particularly maize) is the primary environmental hotspot and establishing a global warming potential of 3.77 kg CO2-eq per kilogram of live weight.

The Gist

Imagine you're buying a loaf of bread. You know the baker made it, but have you ever wondered about the journey of the wheat, the fuel for the truck that delivered the flour, or the electricity used to run the oven? Now, imagine doing that same "backstory" check for a chicken you buy at the store.

That is exactly what this paper does, but for broiler chickens (the kind raised specifically for meat) in Northeast India. The researchers decided to play detective and trace the entire life of a chicken, from the moment its parents laid the egg (the "cradle") to the moment it arrives at the farm ready for processing (the "farm gate"). They called this detective work a Life Cycle Assessment (LCA).

Here is the story of their findings, broken down into simple concepts:

1. The Big Picture: Why Do This?

Chicken meat is the most popular meat in India, and people are eating more of it every year. It's like the "fast food" of the protein world—cheap, quick, and everywhere. But, just like a fast-food burger, making it takes a toll on the planet. The researchers wanted to know: Exactly how much damage does making one kilogram of chicken meat do to our air, water, and soil?

2. The Investigation: How They Did It

They visited six chicken farms in the hilly, rainy regions of Nagaland and Assam. They didn't just guess; they measured everything.

• The Functional Unit: To make a fair comparison, they didn't just look at "one chicken." They looked at the impact of producing 1 kilogram of live chicken. Think of this as the "standard serving size" for their math.
• The Tools: They used a special computer program (like a super-calculator for the environment) to crunch the numbers on things like feed, fuel, and electricity.

3. The Culprits: Who is Responsible for the Mess?

If the environmental impact of making chicken was a crime scene, the researchers found three main suspects:

• Suspect #1: The Feed (The Big Bad Wolf)

  • The Story: Chickens are like hungry teenagers; they eat a lot. The biggest chunk of the environmental damage (about 56%) comes from the food the chickens eat.
  • The Villain: Specifically, Maize (Corn). The farms used a lot of corn-based feed. Growing corn requires a lot of fertilizer and energy. It's like the corn is the "heavy lifter" of the environmental burden.
  • The Second Villain: Soybeans. While corn was the main issue for climate change, soybeans were the biggest problem for how much land and water they used to grow.

• Suspect #2: The Long Haul (Transportation)

  • The Story: In this part of India, there aren't many local factories making chicken feed or hatcheries making baby chicks. So, trucks have to drive long distances to bring these supplies to the farms.
  • The Impact: This travel contributed about 25% of the pollution. It's like ordering a pizza from a town 50 miles away just to eat it in your backyard—the delivery truck burns a lot of fuel.

• Suspect #3: The Lights and Fans (Electricity)

  • The Story: The chickens need to be kept warm, dry, and well-ventilated. This requires fans and lights running 24/7.
  • The Impact: This made up about 16% of the damage.

4. The Verdict: How Bad Is It?

The researchers calculated that for every 1 kg of chicken produced, it releases 3.77 kg of CO2 (carbon dioxide) into the atmosphere.

• Is this good or bad? It's actually "moderate." It's not the worst, but it's not the best either. It sits right in the middle compared to chicken studies done in Europe or the US.
• The Silver Lining: The chickens' poop (manure) was actually a hero! Instead of being waste, the farmers used it as fertilizer for crops. This saved the farmers from buying chemical fertilizers, which gave the system a "green credit" (a reduction in overall impact).

5. The Solution: How to Make It Greener

The researchers didn't just point out the problems; they offered a "cheat sheet" for improvement:

• Eat Local: Instead of importing feed ingredients from far away, the region should grow its own corn and soy. This would cut out the long, polluting truck rides.
• Build Local Factories: If they built a local hatchery (a factory for baby chicks) and a local feed mill, the trucks wouldn't have to drive as far.
• Super-Charge the Chickens: If farmers can breed chickens that grow faster and eat less food to reach the same weight (better "Feed Conversion Ratio"), they need less corn and soy, which lowers the impact.
• Go Solar: Instead of using grid electricity for fans and lights, putting solar panels on the chicken coop roofs could clean up the energy bill.

The Bottom Line

This paper is the first time anyone has taken a deep, scientific look at the environmental cost of chicken farming in India. It tells us that what the chickens eat is the biggest problem, followed by how far that food travels.

By switching to locally grown feed, building local supply chains, and using smarter farming techniques, India can keep feeding its growing population of chicken lovers without choking the planet. It's a reminder that even something as simple as a chicken dinner has a complex, global journey behind it.

Technical Summary

1. Problem Statement

Despite India being one of the world's largest producers of broiler meat (accounting for 50% of total meat production in the country) and experiencing rapid annual growth (8–10%), there was a critical lack of data regarding the environmental efficiency of its production systems. While Life Cycle Assessment (LCA) studies exist for poultry in North America, Europe, Australia, and Brazil, no comprehensive LCA had been conducted for the Indian context. Given the rising demand for animal protein and the associated pressure on natural resources, there is an urgent need to identify environmental "hotspots" in the Indian broiler supply chain to guide sustainable policy and management decisions.

2. Methodology

The study employed an attributional Life Cycle Assessment (LCA) following ISO 14040 and 14044 standards to evaluate the environmental impacts from "cradle-to-farm-gate."

• System Boundary: The assessment covered the period from the transportation of day-old chicks to the farm until the birds reached slaughter weight (42 days). It included:
  • Inputs: Feed production (maize, soybean meal, palm oil, etc.), chick transportation, electricity, diesel, water, and paddy husk (bedding).
  • Exclusions: Breeding/hatching, farm infrastructure construction, pharmaceuticals, and slaughterhouse processing. Land-use change (LUC) was excluded due to data uncertainty.
  • Manure Management: Manure was treated as a residual flow applied to cropland, with a substitution credit applied for avoided synthetic fertilizer production.
• Data Collection: Primary data were collected from six commercial deep-litter broiler farms in Nagaland and Assam (North Eastern Himalayan region) over six consecutive production cycles (36 cycles total) in 2022. Background data were sourced from the Ecoinvent 3.0 database.
• Functional Unit (FU): The primary FU was 1 kg of live weight (LW) broiler chicken at the farm gate. A secondary nutritional FU of 100 g of edible protein was also used.
• Impact Assessment: Data were analyzed using SimaPro (v 9.3.0.3) software with the ReCiPe 2016 Midpoint (H) methodology. Key impact categories included Global Warming Potential (GWP), terrestrial ecotoxicity, land use, fossil resource scarcity, and freshwater eutrophication.

3. Key Contributions

• First-of-its-kind Study: This is the first comprehensive LCA study evaluating the environmental footprint of the Indian broiler chicken production system.
• Regional Specificity: It provides baseline data specific to the North Eastern Himalayan region, characterized by a sub-tropical monsoon climate and vertically integrated farming models typical of India.
• Hotspot Identification: The study successfully isolated specific stages and ingredients contributing most to environmental degradation, moving beyond generic global averages.

4. Key Results

The study quantified the environmental impacts per kilogram of live weight produced:

• Global Warming Potential (GWP): The total GWP was 3.77 kg CO₂-eq/kg LW.
  • Feed: The dominant contributor, accounting for 55.7% of GWP (2.1 kg CO₂-eq).
  • Transportation: Contributed 24.74% (0.93 kg CO₂-eq).
  • Electricity: Contributed 15.91% (0.60 kg CO₂-eq).
  • Note: Paddy husk and diesel usage had negligible impacts.
• Feed Ingredient Analysis:
  • Maize: Responsible for 80% of the feed's total GWP (1.68 kg CO₂-eq/kg LW) and was the primary driver of terrestrial ecotoxicity and fossil resource scarcity.
  • Soybean Meal: The second-largest contributor to GWP (0.27 kg CO₂-eq) but the primary driver for land use (50.87% of feed land use) and water consumption (50% of feed water use).
• Other Impact Categories:
  • Terrestrial Ecotoxicity: Primarily driven by transportation (53%) and feed (40.83%).
  • Land Use: 96% attributed to feed production.
• Comparison: The results fall within the range of global studies but are on the higher side, largely due to long-distance transportation of inputs and specific feed formulations.

5. Significance and Recommendations

The study highlights that the Indian broiler industry, while economically vital, faces significant environmental challenges driven by feed production and logistics.

Key Recommendations for Sustainability:

1. Optimize Feed Formulation:
   • Prioritize locally produced grains (maize and soybeans) to reduce transportation emissions.
   • Improve Feed Conversion Ratio (FCR) through genetic selection and dietary optimization (e.g., reducing crude protein, balancing amino acids, using phytase) to lower overall feed demand.
2. Supply Chain Localization:
   • Establish local hatcheries and feed manufacturing facilities in the North Eastern region to eliminate long-distance transport of day-old chicks and feed.
3. Energy Efficiency:
   • Adopt climate-specific housing designs and install solar panels to reduce reliance on the grid and diesel.
   • Explore energy generation from poultry manure/litter.
4. Management Practices:
   • Reduce the slaughter age (currently 42 days) to 30–32 days where feasible to lower resource accumulation per unit of meat.
   • Promote the use of organic fertilizers and composting for manure management.

Conclusion:
The paper concludes that while the current environmental impact is moderate compared to global standards, significant improvements are possible. By focusing on feed efficiency, localizing supply chains, and optimizing energy use, the Indian broiler sector can significantly reduce its carbon footprint and resource depletion, ensuring long-term sustainability.