Poultry Manure: Fertiliser Value, Waste Management and Sustainable Poultry Farming

Overview

Poultry manure is the droppings of chickens and other farm birds used as organic fertiliser. It is the richest animal manure in nitrogen, phosphorus and potassium, but it must be composted or digested first, because fresh droppings harm plants and wet litter releases ammonia, a form of reactive nitrogen.

Poultry Manure: Meaning, Litter and Fertiliser Value

Poultry Droppings and Litter: Parts and Quantities

On a commercial farm the droppings fall onto bedding spread on the floor of the shed, and the mixture that builds up is called poultry litter. Litter has four parts.

  • Droppings: The excreta of the birds, the main source of nutrients.
  • Spilled feed: Grain and feed that falls from the feeders.
  • Feathers: Shed by the birds as they grow.
  • Bedding: Dry, absorbent, low-cost material such as wood shavings, sawdust, peanut hulls, rice hulls or straw, which soaks up moisture and limits ammonia and harmful germs.

The quantities are large even for one farm. A broiler, reared for about 47 days, leaves behind about 0.9 kg of litter, so a single broiler house holding more than 20,000 birds can produce over 18,000 kg of litter per flock. One chicken produces about 3.6 to 5 kg of manure a month. With 851.81 million poultry birds counted in 2019, manure is one of the biggest by-products of the poultry industry in India.

Diagram: Poultry litter forms on the shed floor from four inputs, droppings, spilled feed, feathers and bedding such as wood shavings, sawdust, rice hulls and straw. A well-managed broiler house keeps litter at 25 to 35 per cent moisture; wet litter cakes and releases ammonia.

Poultry Manure as Fertiliser: Nutrients and Limits

Farmers have used poultry manure as fertiliser for centuries. Like other animal manures it improves soil structure, so the soil holds more water and nutrients, and it feeds the soil's microbes. Its special value is concentration. Chicken litter is prized for its nitrogen and phosphate, and among animal manures it carries the most nitrogen, phosphorus and potassium. Cattle manure, by comparison, is valued as a good source of nitrogen and organic carbon.

Three limits keep poultry manure from replacing chemical fertiliser. First, fresh droppings are harmful to plants and become a valuable fertiliser only after composting. Second, litter is less concentrated than chemical fertiliser and so worth little per tonne, which makes it uneconomic to carry far; it has to be used on farms near the poultry sheds. Third, it loses nitrogen fairly quickly, much of it as ammonia, unless it is stored well.

Location is the real problem. Where many poultry farms cluster and there is little farmland around them, the litter cannot all be spread nearby, its resale value falls, and the surplus becomes a waste to be managed rather than a fertiliser to be sold.

Manure spread in excess also becomes a water problem. Crops use the nitrogen in manure less efficiently than measured doses of mineral fertiliser, and where many animals share too little farmland the surplus washes away. The best known case is Chesapeake Bay in the United States, where runoff from fields fertilised with chicken manure was blamed for rising phosphorus and the growth of dead zones in the bay, and the state of Maryland tried to limit how much poultry manure farmers could use.

Poultry Waste Management: Composting, Biogas and GOBARdhan

Poultry Manure Composting and Poultry Litter Management

Good poultry litter management starts in the shed. In a well-managed broiler house the litter is kept at 25 to 35 per cent moisture, so it stays crumbly. If it gets too wet, around leaking drinkers or under a leaking roof, it cakes into a damp, sticky layer full of bacteria, flies and ammonia, which harms the birds' feet and breasts and raises deaths in the flock. Caked litter must be removed between flocks.

Ammonia is the main enemy inside the shed. Farmers control it with ventilation and with litter amendments, materials mixed into the litter to change its chemistry. The commonest are acidifiers such as alum, sodium bisulfate and ferric sulfate, which lower the surface pH of the litter below 4 for three to five days, so that more nitrogen stays as ammonium instead of escaping as ammonia gas. That also keeps more nitrogen in the litter for the fields.

Composting turns the cleared litter into a safe fertiliser. The work is done by microorganisms such as bacteria and fungi, which break organic waste down into simpler, nutrient-rich manure. In composting, the manure supplies nitrogen and the bedding supplies carbon. A common method is windrow composting, in which the litter is piled into long rows; if the inside of the pile reaches 60 to 71 °C, the heat kills harmful bacteria such as E. coli and Salmonella. Composted manure is also bagged and sold as a soil amendment.

Biogas, Compressed Biogas and the GOBARdhan Scheme

Poultry manure can also make energy. In a biogas plant, microbes break down organic waste without air and give biogas, mostly methane, which can be cleaned and compressed into compressed biogas (CBG) for vehicles and piped gas. In low- and middle-income countries the usual feedstocks are cattle dung, poultry manure, crop residues and food waste, and using them captures methane that would otherwise escape as the waste rots. The slurry left behind, the digestate, becomes organic manure. Litter can also be burnt directly. Several power stations in Britain burn chicken and turkey litter as their primary fuel; the first three in the world were Thetford, Eye and Glanford, and the largest of them, Thetford, generates 38.5 megawatts.

Flow diagram: Animal dung, crop residue, press mud and other organic waste go into a digester where microbes work without air. It gives biogas, upgraded to compressed biogas for CNG and PNG, and digestate, made into fermented organic manure. The GOBARdhan scheme of ₹23,731 crore for 2026-27 to 2035-36 assures purchase of CBG at ₹2,110 per million British thermal units; organic manure gets ₹1,500 a tonne.

India's policy for this is GOBARdhan (Galvanising Organic Bio-Agro Resources Dhan), launched in April 2018 under the Swachh Bharat Mission (Grameen) to turn cattle dung and other organic waste into biogas and manure, with the Department of Drinking Water and Sanitation coordinating the ministries involved. Progress on compressed biogas was slow. The Sustainable Alternative Towards Affordable Transportation (SATAT) initiative of 2018 aimed at 5,000 compressed biogas plants by 2023, but only 132 had been completed by June 2026. The National Circular Bioenergy Scheme of 2026 is meant to change that.

  • Outlay and period: In August 2026 the Union Cabinet approved the National Circular Bioenergy Scheme, GOBARdhan, with ₹23,731 crore for 2026‑27 to 2035‑36.
  • Target: A roughly tenfold rise in compressed biogas output, from about 0.4 million to 4 to 6 million standard cubic metres a day.
  • Capital help: ₹1.25 crore per tonne per day of new capacity, up to ₹30 crore per project.
  • Assured sale: Purchase of all eligible output, or part of it, at ₹2,110 per million British thermal units, about ₹98 a kilogram.
  • Manure: Around 250 million tonnes of organic manure for farmers is expected, and fermented organic manure from such plants earns market development assistance of ₹1,500 a tonne.

Environmental Impact of Poultry Farming: Ammonia, Nitrogen and Runoff

Ammonia and Reactive Nitrogen from Poultry Litter

The nitrogen in poultry droppings is mostly uric acid and organic nitrogen. Microbes in the litter turn it into ammonium (NH4+), a form plants can use, which binds to the litter and dissolves in water. Part of the ammonium then becomes ammonia gas (NH3), and high temperature, high pH and wet litter all speed that change. Ammonia irritates the eyes and breathing of the birds, weakens their resistance to infection, slows their growth and lowers their feed efficiency, and, once vented outside, causes health and environmental problems.

Process diagram: Microbes in the litter turn uric acid and organic nitrogen into ammonium, NH₄⁺, which stays in the litter and which plants can use; part of it becomes ammonia gas, NH₃, which escapes to the air. High temperature, high pH and wet litter speed the change; acidifiers such as alum and sodium bisulfate, dry litter and ventilation hold the nitrogen as ammonium.

Ammonia is one form of reactive nitrogen, the name for every form of nitrogen except the inert nitrogen gas (N2) of the air. Nitrogen oxides, ammonia, nitrous oxide (N2O) and nitrate are all reactive nitrogen. Just over half of all reactive nitrogen entering the biosphere now comes from human activity, and an excess of it causes problems such as eutrophication. Agriculture adds it in several ways. Fertilised soils give off nitrogen oxides, and soils and livestock operations release ammonia that is carried downwind. Nitrous oxide is about 300 times more effective than carbon dioxide as a greenhouse gas, and in 2020 India produced 10.9 per cent of the world's human-made nitrous oxide emissions, second only to China.

Antibiotics in Poultry Feed and Antimicrobial Resistance

Antibiotics are the other hidden load in poultry manure. They are mixed with the feed of livestock and poultry to check infection, and some of them pass into the droppings. Livestock manure spread on fields typically carries residual antibiotics at 1 to 10 mg per kg, along with resistant bacteria and resistance genes, and crops grown in such soil can take up antibiotics. Overuse in medicine and agriculture is a main driver of antimicrobial resistance, the ability germs gain to survive the drugs meant to kill them. In June 2026 scientists suggested using Krishi Vigyan Kendras to gather data on antibiotic residues in soils and on poultry and dairy farms.

Resistance does not stay inside hospitals. India is especially exposed because it faces more frequent droughts, heavy antibiotic use in people and livestock, and irrigation with wastewater at the same time. Drought matters because drying soil raises the concentration of natural antibiotics in it, which favours resistant bacteria. Self-medication, taking antibiotics without a doctor's advice, is one of the primary reasons resistance evolves, and the same logic applies on the farm. Antibiotics are meant to treat infections, so giving them routinely in feed to speed growth or prevent disease only adds to the selection of resistant germs. Several countries, including Canada, China, Japan and the United States, have restricted antibiotics in livestock.

India's main instrument against resistance is the National Action Plan on Antimicrobial Resistance. The first plan came in 2017, and the second, for 2025 to 2029, was launched on 18 November 2025 to fix its gaps by giving each sector ownership of its tasks, strengthening coordination across ministries and bringing in the private sector. The global frame is the One Health approach of the World Health Organization (WHO), the Food and Agriculture Organization (FAO), the UN Environment Programme and the World Organisation for Animal Health; the WHO's global plan for 2026 to 2036 aims to cut antimicrobial use in agrifood systems, and countries report their progress every year through a self-assessment survey.

Feed, Grain and Climate Risk in Poultry Farming

Feed Conversion Ratio: Chicken Compared with Beef and Pork

Part of what makes poultry farming more or less sustainable is how much feed it needs. The feed conversion ratio (FCR) is the feed eaten divided by the meat or eggs produced, so a lower number means less feed per kilogram of food. Broilers are among the most efficient farm animals. In the United States in 2011 they had an FCR of 1.6 and reached market weight in 39 days, and the world average around 2013 was about 2.0 on live weight and 2.8 on carcass weight. Beef cattle in the United States ran above 6 on live weight.

Table 1. Feed conversion ratios of poultry, pigs and beef cattle
Animal and system Feed conversion ratio Note
Broilers, United States, 2011 1.6 (live weight) Market weight in 39 days
Broilers, world average, 2013 2.0 live weight, 2.8 carcass Average across systems
Laying hens, United States, 2011 About 2 About 330 eggs per hen a year
Average backyard flock 9.2 for eggs, 14.6 for carcass Far less efficient
Pigs, United Kingdom and Europe, 2011 About 3 at slaughter (weight gain) About 1 as piglets
Beef cattle, United States, 2013 Above 6 (live weight) Typical range 4.5 to 7.5

Breeding is the main reason broilers became so efficient. US broilers halved their FCR between the early 1960s and 2011, mostly through better genetics.

Range chart of grain needed to produce one kilogram of meat: Beef 0.9 to 7.9 kilograms, pork 0.1 to 4.3 kilograms and chicken 0 to 3.5 kilograms, depending on the production system and the feed.

Measured as grain, chicken again comes out lowest. One kilogram of beef can need 0.9 to 7.9 kg of grain, pork 0.1 to 4.3 kg and chicken 0 to 3.5 kg, depending on the system and the feed. Chicken's range is the lowest of the three, though the ranges overlap, and the feed grown for it still uses land, water and fertiliser.

Maize, Ethanol and the Food, Feed and Fuel Contest

Commercial poultry feed depends on grain, and maize and soybean are the two most important feed grains. That ties the poultry farm to the grain market, which in India is changing. Nearly three-fourths of India's ethanol came from grain, mostly maize, by August 2026, as the country blended ethanol into petrol. The shift away from sugarcane shows in the share of sugar diverted to ethanol, which fell from about 12 per cent in 2022‑23 to about 9 per cent in 2025‑26, and the government fixes a higher administered price for ethanol made from maize than for ethanol made from rice. Maize export earnings have fallen, and India was a net importer of maize in 2025.

The same harvest of grain can feed people directly, feed birds that become food, or become fuel, and each use competes with the others. For sustainable poultry farming, the answer lies in raising maize and soybean output, cutting feed waste through better FCR, and using by-products where they can replace grain.

Heat Stress and Climate Risk for Poultry Farms

Poultry is also exposed to climate change. Livestock suffer acute heat stress once the thermal humidity index passes a threshold, and sudden temperature spikes can cause mass deaths of poultry in farms without industrial-level climate control.

Each 1 °C of warming cuts the yields of maize, rice, soybean and wheat by around 6 per cent, and 2025 ranked among the three hottest years on record. Heat therefore hits poultry twice, directly in the shed and indirectly through the price of feed.

Sustainable Poultry Farming in India: Practices and Policy

Sustainable Poultry Farming Practices from Shed to Field

Sustainable poultry farming means producing eggs and meat while keeping the farm's waste, nitrogen, drugs and climate risk under control. The practices run from the shed to the field.

  • Dry litter: Litter is kept at 25 to 35 per cent moisture, leaking drinkers are fixed, and caked litter is removed between flocks.
  • Less ammonia: Acidifying litter amendments and ventilation hold nitrogen as ammonium.
  • Hot composting: Litter is composted in windrows hot enough (60 to 71 °C) to kill E. coli and Salmonella before it goes to the field.
  • Measured spreading: Manure goes only on nearby land and in measured amounts, so that phosphorus and nitrogen do not run off.
  • Biogas for the surplus: Surplus litter goes to biogas and compressed biogas plants, which give fuel and fermented organic manure.
  • Antibiotics only for treatment: Drugs are given to treat disease, under veterinary oversight, not routinely in feed.
  • Protection from heat: Sheds are cooled and ventilated against heat waves, and the birds have shade.

Backyard poultry fits this picture in its own way. The National Livestock Mission supports rural units of hardy, low-input birds suited to free-range rearing and promotes low-cost feeding. Disease control is part of sustainability too, and the 2024 Poultry Disease Action Plan builds biosecurity, vaccination and early detection into one framework.

Previous Year UPSC‑CSE Questions

Each Prelims question is explained option by option, and each Mains question comes with an answer outline.

  1. UPSC Prelims 2019Consider the following statements :
    1. Agricultural soils release nitrogen oxides into environment.
    2. Cattle release ammonia into environment.
    3. Poultry industry releases reactive nitrogen compounds into environment.

    Which of the statements given above is/are correct?

    1. a 1 and 3 only
    2. b 2 and 3 only
    3. c 2 only
    4. d 1, 2 and 3
    How to approach this Prelims question

    Question type: Multiple statements

    Approach: Each statement names a source of a nitrogen compound, so the test is whether that compound is reactive nitrogen and whether the source releases it.

    • Step 1: Agricultural fertilisation and soil processes give off nitrogen oxides, so statement 1 is correct.
    • Step 2: Ammonia is emitted from livestock operations, cattle included, so statement 2 is correct.
    • Step 3: Microbes in poultry litter turn uric acid into ammonium and ammonia gas, and ammonia is reactive nitrogen, so statement 3 is correct.

    Trap to watch: Students who take reactive nitrogen to mean ammonia alone pick (b) and leave out the soils, but nitrogen oxides, nitrous oxide and nitrate are reactive nitrogen too, so a source of any of them counts.

    Why each option is right or wrong:

    • (a) 1 and 3 only: Wrong. Statement 2 is also correct; livestock operations emit ammonia.
    • (b) 2 and 3 only: Wrong. Statement 1 is also correct; fertilised soils give off nitrogen oxides.
    • (c) 2 only: Wrong. Statements 1 and 3 are also correct.
    • (d) 1, 2 and 3: Correct. Soils, cattle and poultry litter are all sources of reactive nitrogen.

    Answer: (d) 1, 2 and 3. Soils, livestock and poultry litter all release reactive nitrogen.

  2. UPSC Prelims 2019Which of the following are the reasons for the occurrence of multi-drug resistance in microbial pathogens in India?
    1. Genetic predisposition of some people
    2. Taking incorrect doses of antibiotics to cure diseases
    3. Using antibiotics in livestock farming
    4. Multiple chronic diseases in some people

    Select the correct answer using the code given below.

    1. a 1 and 2
    2. b 2 and 3 only
    3. c 1, 3 and 4
    4. d 2, 3 and 4
    How to approach this Prelims question

    Question type: Select from a list

    Approach: Resistance arises in the microbes under the pressure of antibiotic use, so the test is whether each item concerns how antibiotics are used.

    • Step 1: Genetic predisposition of some people is not a reason, because resistance arises in the microbes, by mutation, gene transfer and selection under antibiotic use, not from the patient's genes.
    • Step 2: Incorrect doses of antibiotics are a reason, because misuse drives resistance.
    • Step 3: Antibiotics in livestock farming are a reason, because overuse in agriculture drives resistance.
    • Step 4: Multiple chronic diseases are not in themselves a cause of resistance, because they say nothing about how the drugs are used.

    Trap to watch: Option (d) tempts students who think chronic illness breeds resistance, but statement 4 describes the patient, not the use of the drug, and resistance comes from how antibiotics are used.

    Why each option is right or wrong:

    • (a) 1 and 2: Wrong. Statement 1 is not a cause; resistance develops in the microbes.
    • (b) 2 and 3 only: Correct. Wrong doses and antibiotics in livestock are both forms of misuse.
    • (c) 1, 3 and 4: Wrong. Statements 1 and 4 describe the patient, not drug misuse.
    • (d) 2, 3 and 4: Wrong. Chronic disease in itself is not a cause of resistance.

    Answer: (b) 2 and 3 only. Misuse of antibiotics, in people and in livestock, drives resistance; the patient's genes and chronic illness do not.

  3. UPSC Mains 2014 GS‑IIICan overuse and free availability of antibiotics without Doctor's prescription, be contributors to the emergence of drug-resistant diseases in India? What are the available mechanisms for monitoring and control? Critically discuss the various issues involved.
    Answer outline

    The outline sets out what the question asks, the main arguments, relevant examples and the direction of the conclusion; it is not a full model answer.

    Directive verb: Critically discuss

    Approach: Agree, and show how overuse and over-the-counter sale drive resistance, in people and in livestock; list the monitoring and control mechanisms; then weigh the issues that blunt them.

    Introduction: Antimicrobial resistance arises when microbes evolve ways to survive the drugs meant to kill them; misuse and overuse, in medicine and in agriculture, are its main drivers.

    Body (sub-themes to develop):

    • Overuse and free availability: Self-medication, taking antibiotics without a doctor's advice, is one of the primary reasons resistance evolves.
    • Livestock and poultry: Antibiotics are mixed with feed; manure carries residues of 1 to 10 mg per kg with resistant bacteria and genes, and crops take them up.
    • India's exposure: Frequent droughts, heavy antibiotic use in people and livestock, and wastewater irrigation.
    • Mechanisms: The National Action Plan on Antimicrobial Resistance (2017; second plan 2025 to 2029 with sector ownership, inter-sector coordination and the private sector); One Health with the WHO, the FAO, the UN Environment Programme and the World Organisation for Animal Health; the global plan for 2026 to 2036 with annual self-assessment reporting; and data on residues in soils and farms through Krishi Vigyan Kendras.
    • Issues: Routine use in animal feed, residues in manure and soil, and monitoring that stops at the hospital door.

    Conclusion: Resistance is a One Health problem, and its control needs prescription discipline for people, limits on routine use in animals, and surveillance of farms, soils and water as well as hospitals.

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