The future of poultry starts with acid-base biology

Acid–base balance: The system behind performance

At the center of this shift is acid–base balance, a tightly regulated system that integrates nutrition, environment, and stress, and determines how birds cope before performance is affected. Acid–base balance integrates respiration, renal regulation, mineral buffering, and metabolism into a tightly controlled system. Even small shifts in blood pH or bicarbonate can alter calcium availability, oxygen transport, and overall performance.

With portable diagnostics now enabling real-time measurement, this system becomes a practical tool for earlier detection and more precise interventions. This allows earlier detection, more precise interventions, and improved control of flock performance.

Why traditional signals fall short

Production decisions have long been guided by formulation targets, environmental controls, and performance indicators. These remain essential, but they are indirect. They tell us what has happened, not why it happened, and rarely in time to prevent it.

This is clear in electrolyte management. Dietary electrolyte balance (DEB) has long guided formulation, yet it cannot reliably predict how birds respond in practice. The same balance can produce very different physiological outcomes depending on adjacent factors such as respiratory health, stocking density, ventilation or drinking water chemistry.

This gap explains a persistent challenge across the industry: similar inputs, different results.

When stress becomes physiology

Stress in poultry production is often framed as an external factor, temperature, ventilation, or stocking density. Those factors matter because of how they change the bird’s internal balance.

Heat stress is a clear example.  As birds pant to regulate body temperature, they lose carbon dioxide. This rapidly shifts blood chemistry, increasing pH and reducing available bicarbonate. These changes do not wait for performance to decline. They begin within minutes, altering electrolyte balance and affecting downstream processes such as calcium availability and metabolic stability. By the time feed conversion or mortality shifts, the physiology has already changed.

Similar to the profound influence of the respiratory tract on blood acid-base status, kidney health plays a significant role in electrolyte equilibrium and metabolic health. Disturbances to kidney function associated with mycotoxins, heavy metals, inadequate vitamin nutrition, disease or nutritional stress, can have substantial unexpected effects on the ability of the bird to regulate blood pH and associated biomarkers such as bicarbonate or chloride.

Biology leaves a signature

One of the most important advances in acid–base understanding is not just detecting imbalance but interpreting it. Different stressors leave distinct physiological signatures in the blood. Rather than seeing “something is wrong,” it becomes possible to identify whether the underlying driver is dietary imbalance, environmental pressure, or compromised organ function.

Figure 1 illustrates illustrate common acid–base derangement patterns in commercial broilers. The first two profiles represent a balanced cation–anion distribution in healthy birds, while the others show characteristic disturbances such as hyperchloremic metabolic acidosis (normal anion gap) and high anion gap metabolic acidosis. Each pattern reflects a different underlying physiological driver, providing a practical framework to distinguish between nutritional, environmental, and health-related stressors.

Figure 1. Acid–base patterns reveal the source of physiological stress | Source: dsm-firmenich

The value of this is practical. Instead of generalized responses, interventions can be targeted to the actual cause.

Why minerals do not behave as expected

Acid–base biology also helps explain why perfectly formulated diets sometimes fail to deliver expected results. Calcium is a case in point. Nutrition programs typically focus on total calcium levels, yet what ultimately matters is the ionized fraction—the portion that is biologically active. Blood pH directly influences this fraction. As pH increases, the availability of ionized calcium declines, even if total calcium remains unchanged (Figure 2).

Figure 2. Effect of altering plasma pH using dietary salts on plasma ionized calcium in broiler chickens (Nursoy et al., 2011).

This means birds can experience a functional calcium deficit despite receiving adequate dietary supply. The consequences appear in familiar ways: weaker eggshells, reduced bone strength, and increased variability in performance.  The underlying issue is not the formulation itself, but how physiology is shaping nutrient availability.

A new window into flock health

The real shift comes from the ability to measure these changes directly.  Portable, on-farm diagnostic tools now allow real-time assessment of blood chemistry, including pH, bicarbonate, key electrolytes, and the anion gap.  Together, these markers provide an integrated view of the bird’s physiological state. This turns acid–base balance into a practical tool.  Instead of relying on assumptions, producers can see how birds are responding in the moment, whether to heat stress, dietary changes, or emerging health challenges.

From reacting to managing

This creates a fundamental change in how decisions are made. Rather than adjusting nutrition or management after performance declines, it becomes possible to act earlier. Signals from blood chemistry reveal shifts in physiology before they translate into economic loss. The process becomes straightforward: detect the signal, interpret the cause, and act with precision (Figure 3).

Figure 3. Conceptual framework for the use of blood biomarkers to monitor blood acid/base balance in commercial poultry and the adjacent influencing factors and related outcome measures. | Source: dsm-firmenich

The shift underway

The science behind acid–base balance is not new. What has changed is access.  For decades, these mechanisms were understood but difficult to measure in commercial settings. Now, with portable diagnostics and growing datasets, the gap between theory and practice is closing. That changes the role of physiology. It becomes the link between nutritional design, environmental management, and biological response—bringing these elements together into a single, measurable system.

Platforms such as Verax^TM are emerging to make this shift practical—connecting physiological data to real-time decision-making across production systems.

Bottom line

Performance shows where you have been. Acid–base biology shows where you are headed. As production systems become more complex and variable, the ability to act early, before physiology turns into performance loss, will define the difference between managing outcomes and controlling them.

This Feed Talks article is based on the peer-reviewed review Blood acid/base balance in poultry: Dietary, environmental, and physiological determinants and emerging diagnostic opportunities, published in Poultry Science, and distils its key scientific insights into practical applications for commercial poultry production.