Heat Stress in Cows: Effects on Milk Production, Reproduction and Fertility
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Table of Contents
Why heat stress matters
Heat stress in cows is one of the most important seasonal challenges in dairy production. When temperatures rise, cows eat less, produce less milk and may show poorer reproductive performance, especially if the hot period lasts for several days or weeks.
Heat stress is not only a comfort issue. It affects physiology, metabolism and immune function, which means the whole production system can become less efficient.
How heat stress affects milk production
One of the clearest effects of heat stress is a drop in milk production. When cows are exposed to high temperatures, they often reduce dry matter intake, and that leads to less energy available for milk synthesis.
The result is not only lower yield, but also greater production instability, particularly in high-performing dairy cows that already have demanding nutritional requirements.
Impact on reproduction and fertility
Heat stress also has a strong effect on reproduction and fertility. Cows under heat load may show weaker estrus expression, lower conception rates and more difficulty maintaining reproductive efficiency.
This is especially important because reproductive stress often overlaps with other critical phases, such as the peripartum period and early lactation, when animals are already under metabolic pressure.
What cows need during heat stress
During heat stress, cows need more than just water and shade. They also benefit from nutritional support that helps them remain stable during periods of environmental and physiological challenge.
In practical terms, that means focusing on:
- Stress resilience.
- Immune balance.
- Anti-inflammatory support.
- Transition-cow management.
- Nutritional strategies that help the cow cope with heat load.
How W-Balance fits in
W-Balance is San Marco product most directly linked to heat stress in cows. The catalog describes it as a specific product formulated for ruminants to be used during physiological, environmental or productive stress periods. It is indicated for inflammatory conditions, recovery, the peripartum phase, and cases of hyperthermia caused by hot housing or summer heatwaves.
The formula includes propylene glycol, glycerol, calcium carbonate as carrier, natural extracts of Rosa canina L., Echinacea purpurea and Boswellia serrata, plus L-lysine, DL-methionine and organic selenomethionine.
This makes W-Balance relevant for dairy cows that need support when heat stress starts affecting comfort, immunity and productivity.
FAQ
What is heat stress in cows?
Heat stress happens when cows are exposed to temperatures and humidity levels that make it hard for them to maintain normal body functions, feed intake and productivity.
How does heat stress affect milk production?
It reduces dry matter intake and energy availability, which leads to lower milk yield and less stable production.
How does heat stress affect fertility?
It can reduce estrus expression, lower conception rates and impair reproductive efficiency.
Which San Marco product is most relevant for heat stress?
W-Balance is the most directly relevant product because it is formulated specifically for ruminants during environmental and productive stress, including hyperthermia and summer heatwaves.
What ingredients does W-Balance contain?
It contains propylene glycol, glycerol, calcium carbonate, Rosa canina L., Echinacea purpurea, Boswellia serrata, L-lysine, DL-methionine and organic selenomethionine.
Can W-Balance be used during the peripartum phase?
Yes, the catalog states that it is useful in the peripartum phase to help reduce body temperature and support the animal during stress.
