It was a pleasure to visit the Gurgaon office of Dovoy Chemicals India Pvt. Ltd., a biotechnology-driven company that has been delivering innovative solutions to industries worldwide. With a strong presence across Asia, Africa, and the Middle East, Dovoy has established itself as a trusted partner in animal health, nutrition, grain processing, food ingredients, and industrial solutions.

During my visit, I had the opportunity to interact with Mr. Amit Kaushik, Director, Dovoy Chemicals India Pvt. Ltd.; Mr. Duttle Bing, General Manager – ASPAC & EMEA, Dovoy Inc. Singapore; Dr. Vipul Gohel, Director, MIV Biosolutions and Channel Partner for Dovoy; Mr. Anand Singh, Business Head – Animal Health; Dr. Sumit Raja, Technical Manager – Animal Health; Mr. Shyam Sunder Sharma, Business Head – DGP; Ms. Dhanashri Shitole, Zonal Sales Manager-South & Maharashtra and Ms. Akanksha Sethi, Dovoy.
Mr. Amit Kaushik highlighted that what truly differentiates Dovoy is its unwavering commitment to innovation, research, and quality. The company operates advanced ISO 17025:2017 accredited laboratories where product development, quality assurance, enzyme assays, thermostability testing, and customized solution development are carried out to meet the evolving needs of modern industries.

Mr. Kaushik further emphasized that Dovoy’s vision extends beyond supplying products. The company is focused on delivering holistic solutions and value-added services to customers. Complimentary amino acid profiling services, supported by their ISO 17025:2017 accredited laboratory, provide customers with greater confidence in feed quality and nutritional accuracy. Dovoy’s state-of-the-art laboratory is equipped with sophisticated technologies including the Agilent HPLC 1260, advanced spectrophotometers, Kjeldahl Distillation systems, Class-II Biosafety facilities, biodigesters, and Neogen Raptor platforms. These capabilities support quality assurance and the development of innovative biotechnology solutions across multiple sectors.

According to Mr. Shyam Sunder Sharma, Dovoy’s expertise in proximate analysis, protease enzyme thermostability testing, aflatoxin reduction solutions, microbial load analysis, amino acid profiling, and advanced enzyme assay testing provides a significant competitive edge. The company adheres to globally recognized standards including ISO, GMP, REACH, Halal, FSSAI, Kosher, ZDHC, and D&B certifications.

In the Animal Health & Nutrition sector, Dovoy offers a comprehensive portfolio of feed additive solutions including enzymes, organic trace minerals, yeast-based products, antioxidants, immune modulators, gut health solutions, toxin binders, acidifiers, and lipid metabolism enhancers. These technologies are designed to improve nutrient utilization, gut health, productivity, and overall farm profitability, as shared by Mr. Anand Singh and Dr. Sumit Raja.

The visit was followed by an engaging podcast hosted by Ms. Dhanashri Shitole and Ms. Akanksha Sethi, where I shared my thoughts on the “Future of the Indian Poultry Feed Industry.” I look forward to its release of this Podcast in the coming days.

The visit provided valuable insights into how biotechnology, innovation, and scientific excellence are shaping the future of animal nutrition and sustainable livestock production. It was inspiring to witness Dovoy’s commitment to developing practical, performance-oriented solutions backed by robust research and field validation.

Balancing Air Quality in Poultry Houses: Tackling Ammonia and Humidity for Health and Productivity

Dr. Pawar Rutik Namdev1 (MVSc Scholar), Dr. Shipra Tiwari1 (MVSc Scholar),
Dr. Mahendra Kumar Patel1 (Ph.D Scholar)
1College of Veterinary Science and Animal Husbandry, DUVASU Mathura (281001), India

Abstract
The environment within poultry houses plays a decisive role in the overall health, performance, and welfare of birds. Among various factors, the concentration of ammonia (NH₃) and the level of relative humidity (RH) are the most critical. Ammonia, released from the microbial breakdown of waste, and excessive humidity, which influences litter moisture, often work together to create poor air quality. This review highlights how these two factors are produced, their combined impact on broilers and layers, and outlines practical approaches for monitoring and management to maintain profitability and bird well-being.

1. Introduction
For poultry farmers, achieving optimal productivity requires not just good feed and genetics, but also maintaining a favorable environment inside the house. Air quality, ventilation, and litter condition all directly affect flock health. Ammonia gas and humidity levels are particularly important, as they can significantly influence bird growth, egg production, immune strength, and overall welfare. Excessive ammonia harms the respiratory tract, reduces feed intake, and lowers growth efficiency, while uncontrolled humidity leads to wet litter, higher ammonia emissions, and disease outbreaks. To ensure healthy flocks, ammonia should ideally be kept below 20–25 ppm and RH within 50–70%.

2. How Ammonia and Humidity Build Up
2.1 Generation of Ammonia
Ammonia is created naturally when uric acid in droppings is decomposed by bacteria. The process is intensified under warm, moist, and alkaline conditions. The type of litter material, stocking density, feed composition (especially protein levels), and frequency of manure removal all influence ammonia levels. Houses with poor cleaning routines or high moisture accumulation often experience higher NH₃ concentrations.

2.2 Role of Humidity
Humidity directly controls litter moisture content. High RH slows the evaporation of water from bedding, resulting in wet litter that promotes microbial activity and ammonia release. Conversely, very low RH increases dust particles in the air, which irritates the birds’ airways. Thus, moisture management is closely tied to controlling ammonia levels.

3. Impacts on Bird Health and Physiology
3.1 Respiratory Effects
Ammonia acts as a strong irritant to the respiratory tract. Continuous exposure damages the trachea and air sacs, reducing the ability of cilia to filter pathogens. Birds exposed to more than 20–25 ppm are more prone to respiratory diseases such as Newcastle, bronchitis, and Mycoplasma infections. Vaccination responses also tend to decline.

3.2 Eye and Skin Irritation
Chronic exposure to ammonia causes conjunctivitis, watery eyes, and corneal damage. High RH contributes to wet litter that leads to footpad dermatitis, hock burns, and breast blisters—all of which compromise welfare and reduce carcass quality at processing.

3.3 Growth and Feed Efficiency
High levels of ammonia reduce appetite, slow weight gain, and impair feed conversion. Even a small increase in feed conversion ratio (FCR) significantly raises production costs, especially in large flocks. Performance losses become severe when ammonia concentrations exceed 50 ppm for prolonged periods.

3.4 Immunity
Birds raised in poor air quality often show weaker immune responses. Prolonged exposure to ammonia not only stresses birds but also reduces antibody production after vaccination, leaving them vulnerable to disease outbreaks.

3.5 Egg Production
In layer flocks, poor litter conditions and elevated ammonia cause stress, leading to reduced laying rates, smaller egg size, and poor shell quality. Mortality may also rise due to an increased risk of secondary infections.

4. The Combined Impact of Ammonia and Humidity
Although ammonia and humidity can each harm poultry, their combination is especially damaging. High RH makes litter wetter, which in turn boosts ammonia emissions. Humid air also traps ammonia at bird level, ensuring birds inhale more of it. Together, these conditions encourage respiratory infections, coccidiosis outbreaks, poor weight gain, higher mortality, and overall production losses.

5. Monitoring Levels
5.1 Threshold Values
Ammonia: Should remain below 20–25 ppm (ideally closer to 10 ppm). Birds show signs of irritation even at levels humans may not detect by smell.

Relative Humidity: Best maintained between 50–70%. RH above 75% promotes wet litter, while RH below 40% leads to dust and dehydration.

5.2 Measurement Tools
Ammonia: Can be monitored using portable gas detectors, color tubes, or continuous electronic sensors.
Humidity: Inexpensive hygrometers placed at bird height provide reliable readings and are often integrated into automatic ventilation systems.

6. Strategies for Control
6.1 Ventilation
Proper ventilation ensures air exchange, dilutes gases, and removes excess moisture.

In cold weather: minimum ventilation prevents humidity build-up without chilling the birds. fans and circulation systems increase air movement and reduce heat stress.

6.2 Litter Management
Maintaining dry litter is essential. Turning litter, replacing wet spots, using absorbent bedding materials, and preventing drinker leaks are key practices. Chemical litter amendments such as alum or sodium bisulfate can reduce pH, minimizing ammonia release.

6.3 Nutrition
Adjusting feed formulations to match amino acid requirements reduces nitrogen excretion. Enzyme supplements and probiotics may also improve digestion and reduce ammonia in manure.

6.4 Housing Design
Well-insulated poultry houses with good drainage and properly installed nipple drinkers minimize litter moisture. Preventing condensation on walls and ceilings also helps keep humidity under control.

6.5 Advanced Methods
Technologies like air scrubbers, biofilters, or controlled ozone applications are being tested for large commercial units. Automated environmental control systems that integrate NH₃ and RH sensors with fans and heaters are becoming increasingly popular.

7. Economic Importance
Poor air quality silently eats into farm profits. Lower feed efficiency, reduced weight gain, carcass downgrades, increased mortality, and higher veterinary costs all add up to significant economic losses. Studies show that ammonia-related performance drops can cost large poultry complexes thousands of dollars weekly. Investing in better litter management, ventilation, and nutritional adjustments often proves cost-effective in the long run.

8. Evidence and Case Studies
Field surveys often reveal ammonia exceeding safe levels during winter when ventilation is minimized, leading to higher respiratory issues and welfare concerns. Controlled trials consistently show that birds exposed to even moderate ammonia (20–30 ppm) suffer from lower growth rates, poorer immune response, and more lesions compared to those raised under optimal conditions. Interventions such as litter acidifiers, improved diet formulations, and enhanced ventilation schedules have been shown to significantly reduce ammonia emissions and improve performance.

9. Recommendations for Farmers
– Check RH daily: maintain between 50–70%.
– Monitor ammonia regularly: aim for <20 ppm.
– Fix water leaks immediately to avoid wet litter.
– Adjust ventilation by season to balance temperature, RH, and air quality.
– Work with a nutritionist to optimize protein levels in diets.
– Use litter amendments wisely to reduce ammonia emissions.

10. Future Outlook
The integration of smart sensors and artificial intelligence into poultry housing systems may soon allow farmers to predict ammonia build-up and adjust ventilation automatically. Further research is needed to quantify the long-term welfare and production benefits of advanced technologies and to make them affordable for small- and medium-scale farmers.

11. Conclusion
Ammonia and humidity are closely linked environmental challenges in poultry houses. Both negatively affect bird health, welfare, and productivity when not controlled. Together, they magnify each other’s harmful effects, resulting in economic losses and compromised flock performance. Regular monitoring, proactive litter and ventilation management, balanced nutrition, and modern environmental control tools are essential for maintaining a healthy environment. Addressing these issues not only supports profitability but also improves animal welfare, ensuring sustainable poultry production.

1. Introduction

1.Moisture and Microbial Proliferation
Water Activity (aw): Microbial proliferation, particularly of fungi and bacteria, is predominantly influenced by water activity rather than total moisture content. Most spoilage microorganisms exhibit optimal growth when water activity exceeds 0.70.
Fungal and Mold Contamination: Elevated moisture levels create a favourable environment for the growth of molds such as Aspergillus, Penicillium, and Fusarium, significantly increasing the risk of mycotoxin production and contamination.
Bacterial Growth: Excessive moisture also promotes bacterial multiplication, including pathogenic species like Salmonella spp., Escherichia coli, and Clostridium perfringens, posing serious risks to feed safety and animal health.

2. Moisture and Microbial Proliferation
2.1 Water Activity vs. Moisture Content
A clear distinction must be made between moisture content and water activity (aw) when assessing feed safety. Moisture content represents the total quantity of water present in feed, typically expressed as a percentage. Conversely, water activity refers to the proportion of free, unbound water available for microbial growth. This means that even feed with a moderate moisture level can have a sufficiently high water activity to support microbial proliferation.
– Bacteria generally require a water activity level greater than 0.90 to sustain growth.
– Molds and yeasts can proliferate at water activity levels as low as 0.70.
– Feed spoilage tends to accelerate when moisture content exceeds 12–13%, though this threshold may vary depending on storage temperature and duration.

2.2 Molds and Mycotoxin Contamination
Mold growth poses a critical threat to feed quality, especially when feed is improperly dried or stored under humid conditions. The following mold species are commonly associated with feed contamination:
– Aspergillus spp. – Known for producing aflatoxins, particularly under warm and humid environments.
– Fusarium spp. – Responsible for producing fumonisins, zearalenone, and deoxynivalenol (DON).
– Penicillium spp. – Produces ochratoxins along with other harmful secondary metabolites.

A key concern is that mycotoxins are chemically stable, remaining in the feed long after the mold itself becomes invisible or inactive, thus posing ongoing risks to poultry health.
 
High moisture conditions also create an environment conducive to bacterial growth, including several significant poultry pathogens:
– Salmonella enterica – A zoonotic pathogen often introduced through contaminated raw materials or during feed processing.
– Escherichia coli – Certain strains are pathogenic and can impair gut health and performance.
– Clostridium perfringens – Associated with necrotic enteritis, a prevalent and economically significant poultry disease.
These bacteria can rapidly multiply in moist, warm feed, especially when storage hygiene is inadequate, leading to feed borne infections and compromised flock health.

3. Impact of Moisture-Induced Contamination on Poultry Health
3.1 Nutritional Degradation
Elevated feed moisture does more than encourage microbial growth—it also leads to the degradation of essential nutrients, compromising the nutritional quality of the feed:
– Vitamins – Fat-soluble vitamins (A and E) and water-soluble B-complex vitamins are particularly prone to degradation due to moisture-related oxidation.
– Proteins and Fats – Exposure to excess moisture can initiate rancidity and protein denaturation, reducing digestibility and nutritional value.
– Enzymes and Additives – Many feed additives, including enzymes, lose their efficacy when exposed to moisture, due to chemical breakdown or loss of activity.
Consequently, even if the feed meets the formulated nutritional specifications on paper, its actual nutrient availability to the bird may be substantially compromised.

3.2 Gastrointestinal Health and Immunity
Contaminated feed directly impacts the gastrointestinal health and immune status of poultry:
– Induces inflammation of the intestinal lining, leading to enteritis.
– Causes dysbiosis, disrupting the balance of beneficial gut microbiota.
– Reduces nutrient absorption efficiency, contributing to malnutrition.
– Weakens the immune system, increasing the susceptibility to secondary infections.
Chronic exposure to mycotoxins further suppresses immunity, reduces the efficacy of vaccinations, and predisposes birds to coccidiosis, respiratory infections, and other opportunistic diseases.

3.3 Productivity and Performance
The long-term consequences of feeding moisture-damaged or contaminated feed include:
– Poor growth rates, increased feed conversion ratios (FCR), and reduced body weight gains.
– Decline in reproductive performance, including lower egg production and decreased hatchability in breeder flocks.
– Higher mortality rates and escalating veterinary expenses due to disease management.
Therefore, moisture control in feed is not only a matter of safety but a direct factor in maintaining poultry productivity, profitability, and overall farm sustainability.

4. Strategies for Moisture Control in Poultry Feed
4.1 Optimal Storage Conditions
Preventing moisture accumulation in feed requires stringent storage management practices:
– Maintain relative humidity (RH) below 65% in feed storage facilities.
– Ensure adequate ventilation and temperature regulation to minimize condensation risks.
– Utilize moisture-resistant packaging, such as sealed bags or properly maintained silos, to protect feed from environmental humidity.
– Implement a first-in, first-out (FIFO) stock rotation system to prevent prolonged storage that could increase spoilage risk.
4.2 Processing and Drying Practices
Proper processing is essential to minimize residual moisture:
– Ensure feed is thoroughly dried during production to target moisture specifications.
– Monitor post-pelleting cooling times to prevent condensation within storage containers.
– Avoid incorporating high-moisture raw materials unless they are specifically treated or stabilized.
4.3 Use of Additives and Preservatives
Incorporating specific feed additives can help mitigate microbial growth and toxin risks:
– Mold inhibitors (e.g., propionic acid, sorbic acid) suppress fungal proliferation.
– Organic acids reduce pH levels, creating an environment less conducive to bacterial growth.
– Mycotoxin binders (e.g., bentonite, activated charcoal, yeast cell wall components) adsorb harmful toxins in the gastrointestinal tract, reducing absorption and toxicity in poultry.
4.4 Monitoring and Testing
Routine quality assurance is critical for early detection of moisture-related issues:
– Use moisture meters for rapid, on-site moisture assessments.
– Conduct periodic laboratory analyses to evaluate microbial load and mycotoxin presence.
– Apply Hazard Analysis and Critical Control Points (HACCP) principles during feed production and storage to systematically identify and control risks.

5. Regulatory and Safety Implications
Global feed safety standards emphasize moisture control as a critical control point (CCP) due to its role in preventing contamination and zoonotic disease transmission. Compliance with international regulations enhances food safety, promotes animal welfare, and improves market access. Key regulatory frameworks include:
– Good Manufacturing Practices (GMP+)
– ISO 22000 – Food Safety Management Systems
– CODEX Alimentarius Guidelines
– EU Feed Hygiene Regulation (EC No. 183/2005).
Adhering to these standards not only ensures compliance but also strengthens consumer confidence and supports export competitiveness in international poultry markets.

6. Conclusion
Effective moisture management in poultry feed is fundamental to ensuring feed hygiene, animal health, and overall food safety. Elevated moisture levels promote the growth of harmful microorganisms and the accumulation of toxic metabolites, leading to severe implications for poultry health, productivity, and farm economics.By adopting preventive strategies in feed production, storage, and quality monitoring, producers can safeguard feed integrity and protect flock performance. Moisture control should be recognized not as an operational expense but as a strategic investment in animal welfare, economic sustainability, and public health protection.