At what temperature do dairy cows start to feel heat stress?

Heat stress is measured by the Temperature Humidity Index (THI), not temperature alone. Cows feel mild stress as THI nears 68, moderate stress at 72 to 79, and severe stress at 80 and above. High-yielding cows react earliest because they generate more metabolic heat.

What are the signs of heat stress in dairy cows?

Common signs include faster breathing and open-mouth panting, drooling, reduced feed intake, crowding and bunching, seeking shade, falling milk yield, and a rising core body temperature (around 103°F when heat stress begins).

How do electrolytes help cows during heat stress?

Cows lose sodium and potassium through sweat and heavy breathing. A palatable, buffered electrolyte supplement helps restore that balance, supports hydration and rumen function, and helps cows hold feed intake and milk production through heat events.

Does Bovine BlueLite require reformulating the ration?

No. Bovine BlueLite® is DCAD-neutral, so it can be top-dressed or mixed into the TMR during heat stress without reformulating the diet.

PRRS Creates More Than Immediate Immune Stress Treatments

Home Swine PRRS Creates More Than Immediate Immune Stress

June 10, 2026

Respiratory disease challenge triggers oxidative stress that disrupts sow metabolism, compromises piglet viability and drives production losses.

Figure: When oxidative stress occurs through ROS overload, pigs experience cellular damage, gut disruption, inflammation, and mitochondrial dysfunction.

Production consequences

SOW HEALTH & SURVIVAL	REPRODUCTIVE PERFORMANCE	NURSERY PERFORMANCE
Increased mortality Higher MMA incidence Greater disease severity Lower immune function Decreased resilience	Increased number of stillbirths More days open & culling risk Less live pigs born Lower colostrum quality	Increased morbidity & treatment needs Greater pre wean & nursery mortality Decreased antioxidant status at birth Lower feed. intake & nutrient use Lower growth & average daily gain

Oxidative stress is the hidden driver behind PRRS impact.
Managing it is the key to protecting sow performance and the next generation.

Strategic antioxidant support changes production outcomes.

ImmuFend® helps sows and piglets overcome oxidative stress caused by PRRS challenge – supporting health today and performance tomorrow.

PROVEN IN COMMERCIAL PRODUCTION

Why ImmuFend?

Proven support at the right time.

PRE-FARROW	LACTATION	WEANING	NURSERY PLACEMENT
Support antioxidant status before peak physiological demand.	Support sow recovery and piglet transfer through milk.	Support pigs during antioxidant depletion and stress.	Support resiliency during PRRS and respiratory challenge periods.

STRONGER DEFENSES. BETTER PERFORMANCE. HEALTHIER HERDS.

See the full ImmuFend® product details, including feeding rates and packaging sizes, on the product page.

PRRS Creates More Than Immediate Immune Stress

Respiratory disease challenge triggers oxidative stress that disrupts sow metabolism, compromises piglet viability and drives production losses.

Production consequences

SOW HEALTH & SURVIVAL

REPRODUCTIVE PERFORMANCE

NURSERY PERFORMANCE

Oxidative stress is the hidden driver behind PRRS impact. Managing it is the key to protecting sow performance and the next generation.

Strategic antioxidant support changes production outcomes.

PROVEN IN COMMERCIAL PRODUCTION

Why ImmuFend?

Proven support at the right time.

PRE-FARROW

LACTATION

WEANING

NURSERY PLACEMENT

Related Products

ImmuFend®

With you, keeping your animals drinking, eating & producing.

Oxidative stress is the hidden driver behind PRRS impact.
Managing it is the key to protecting sow performance and the next generation.