When looking to improve the health of a dairy herd, one naturally thinks of feed, building comfort, or genetics. However, an essential factor is often underestimated: water.

A dairy cow can drink between 70 and over 150 liters of water per day depending on its production, diet, and climatic conditions. In other words, water is the primary nutrient consumed on a farm. Its quality directly influences feed intake, milk production, animal welfare, and, more broadly, the technical and economic performance of the livestock operation.

But clear water is not necessarily high-quality water. Water containing iron, manganese, bacteria, or an unpleasant taste can reduce animal intake without it being immediately visible. In this article, we will examine why water quality deserves as much attention as the feed ration and what the main points of vigilance are for a dairy cattle farm.

Why is water the primary nutrient for dairy cows?

A dairy cow is composed of about 60% water. Milk itself contains nearly 87% water. It is therefore logical that water requirements increase significantly with the level of production.

According to the Livestock Institute (IDELE), a cow producing a large amount of milk can consume more than 150 liters of water per day. This consumption varies according to several factors:

• milk production;
• outside temperature;
• the dry matter content of the ration;
• the physiological stage;
• the quality of the available water.

When water is easily accessible, fresh, and palatable, animals drink more. This consumption then promotes better dry matter intake, which is essential for proper rumen function and maintaining milk production.

Conversely, water with a metallic odor, an unusual color, or microbiological contamination can lead to a gradual decrease in consumption. This decline often goes unnoticed but can have significant consequences on herd performance.

What impacts can poor water quality have on the herd?

The effects of poor-quality water are not always spectacular. They generally set in gradually and can be wrongly attributed to other factors such as diet or herd management.

The first impact concerns water consumption. If animals drink less, they also consume less feed. In dairy cows, these two parameters are closely linked.

A decrease in intake can subsequently lead to:

• a decrease in milk production;
• poorer utilization of the ration;
• degraded reproductive performance;
• increased heat stress during the summer period;
• a more fragile health status.

Water can also become a vector for contamination when it contains a high bacterial load or when biofilms develop in pipes and troughs. These deposits create a favorable environment for the development of numerous microorganisms that can alter the quality of the distributed water.

Finally, certain physico-chemical parameters like iron or manganese can pose a problem. Although they are naturally present in some groundwater, high concentrations promote deposits in networks, degrade water palatability, and accelerate the formation of biofilms.

How do you know if the water on your farm is high quality?

Unlike public network water, water from a private well or spring is not continuously monitored by health authorities. The responsibility for monitoring therefore rests with the farmer.

However, many farms only have their water analyzed in the event of a visible problem: a drop in production, the appearance of deposits, an unusual odor, or equipment malfunction. The risk is that certain imbalances may remain for several months, or even years, before being identified.

The first step, therefore, is to conduct a complete water analysis. This must address both its microbiological quality and its physico-chemical characteristics.

Among the most important parameters are:

• the presence of bacteria (Escherichia coli, coliforms, enterococci...);
• iron content;
• manganese concentration;
• pH;
• water hardness;
• nitrates;
• turbidity;
• the potential presence of suspended solids.

These analyses make it possible to identify problems that are sometimes invisible to the naked eye. Perfectly clear water can, for example, contain bacteria or have a high concentration of iron capable of disrupting its use.

Experts from the Livestock Institute also recommend not limiting the diagnosis to the point of intake. Water of good quality at the wellhead can degrade as it passes through pipes or troughs, particularly when these are poorly maintained.

Biofilm: an often invisible problem

When discussing water quality, one spontaneously thinks of contaminants present in the source. However, some of the problems appear directly inside the farm's distribution network.

Over time, a deposit called biofilm can form on the walls of pipes, tanks, or troughs. It consists of a mixture of microorganisms, organic matter, and mineral deposits.

Iron and manganese particularly promote its development. The more these elements are present in the water, the more they can serve as a substrate for certain bacteria. The result: deposits gradually increase, pipes become clogged, and the quality of the distributed water degrades.

The problem is that this phenomenon often remains invisible. The animals continue to drink, but the palatability of the water gradually decreases. Watering equipment can also clog more quickly, increasing maintenance requirements.

Regular cleaning of troughs and monitoring of the network remain essential, even when water analyses are satisfactory.

Compliant water is not always optimal water

It is important to distinguish between two concepts: water that complies with regulations and water that is truly adapted to the needs of a dairy herd.

Regulatory thresholds are established primarily to ensure health safety. They do not always take into account the zootechnical performance of the animals.

For example, water can meet regulatory limits while still presenting:

• a high iron content;
• manganese deposits;
• a metallic odor;
• high turbidity;
• reduced palatability.

These characteristics do not necessarily make the water unfit for consumption, but they can influence animal behavior and limit their daily intake.

This is why many farm technicians recommend integrating water quality into the overall audits of the farm, just like feed rations, housing, or ventilation.

Field experience: when water quality changes animal behavior

In the field, the effects of improved water quality are often observed quickly by farmers. At FLX Water, several farms equipped with the Agricultural Solution have reported a change in animal behavior after the system was put into service.

One of the most striking examples concerns a farm where the well water had a high concentration of iron and manganese. After installing a suitable filtration solution, the farmer observed higher water consumption by the animals as well as an improvement in their behavior at the trough.

These field observations do not constitute scientific proof that can be generalized to all farms. However, they illustrate an essential point: water quality is a technical lever that deserves to be studied when a farm is seeking to sustainably improve its performance.

Before implementing any treatment solution, a complete water analysis remains essential in order to precisely identify the parameters to be corrected and to choose the most suitable technology.

Sustainably improving water quality on your farm

Water quality does not depend solely on its source. The entire distribution chain must be taken into account: intake, storage, pipes, troughs, and equipment maintenance.

On many farms, a few good practices already allow for improving the situation:

• having water analyzed regularly, especially after work or a change in the resource;
• frequently cleaning troughs to limit the development of biofilms;
• checking the flow rate of watering points to guarantee sufficient access for all animals;
• inspecting pipes and tanks to detect any potential deposits;
• adapting water treatment when analyses highlight a specific problem.

When high concentrations of iron, manganese, or suspended solids are identified, or when quality problems recur regularly despite good maintenance, it may be relevant to consider implementing an adapted treatment solution.

At FLX Water, the FiltraLife Agricultural Solution was developed to address these issues. It works without electricity or chemicals and helps reduce many contaminants naturally present in water, while improving its taste and odor. Each project begins with a water analysis to verify that the solution is adapted to the farm's needs.

Water quality is often less visible than feed quality. Yet, it accompanies animals throughout their lives. By giving it the same attention as the ration or the comfort of the buildings, farmers have an additional lever to sustainably improve the performance of their operation.

Frequently asked questions

How much water does a dairy cow drink per day?
Depending on its production level, diet, and outside temperature, a dairy cow can consume between 70 and over 150 liters of water per day. High-producing cows are those with the highest requirements.

Is clear water necessarily high-quality water?
No. Water can appear perfectly clear while containing bacteria, iron, manganese, or other elements capable of altering its palatability or use on a farm.

How often should well water be analyzed?
It is recommended to perform an analysis regularly, especially when creating a well, after a change in the resource, or when changes are observed in the animals or facilities.

Are iron and manganese dangerous for cows?
The main problem is often indirect. At high concentrations, they promote deposits in water networks and the development of biofilms, and can reduce the palatability of the distributed water.

Is a filtration solution useful on all farms?
Not necessarily. The choice of treatment always depends on the water analysis results. This is why a preliminary diagnosis is essential before any recommendation.

Because it is consumed in large quantities every day, water deserves to be considered a true nutrient. Monitoring it, analyzing it, and improving its quality when necessary makes it possible to sustainably secure the performance of a dairy operation and the well-being of the herd.

Sources

• Livestock Institute (IDELE) – Technical publications on watering dairy cattle: https://idele.fr
• INRAE – Scientific resources on ruminant water requirements and milk production: https://www.inrae.fr
• CNIEL – Livestock Institute: technical references on dairy cattle farms: https://www.cniel.com
• ANSES – Quality of water intended for consumption: https://www.anses.fr
• FAO – Water and Livestock for Food Security: https://www.fao.org

If you wish to delve deeper into the subject, our article Why is high-quality water important on a farm? explains in more detail the consequences of water quality on farm performance and the best practices to implement.