Tag: Heat stress in cattle
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Late-gestation heat stress impairs daughter and granddaughter lifetime performance
Late-gestation heat stress exerts carryover effects on at least two generations. This quantifies the need for providing heat abatement to dry-pregnant dams to rescue milk loss and to prevent losses in their progeny.
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Late gestation heat stress in dairy cows: Effects on dam and daughter
Heat stress during the dry period has dramatic negative impacts on the cow and her offspring. Cows that experience heat stress in late gestation make less milk and are at greater risk of disease and nutritional issues.
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Effect of heat stress during early, late, and entire dry period on dairy cattle
This study from the University of Florida, Gainesville, found that cooling for the entire dry period increased milk yield up to 30 weeks into lactation. It showed that heat stress at any time during the dry period compromises performance of cows after calving.
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In utero exposure to thermal stress has long-term effects on mammary gland microstructure and function in dairy cattle
Milk yield is significantly lower in first-lactation heifers that experienced fetal heat stress. This study examines how the development of mammary glands are affected by heat stress during gestation.
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Effects of THI on health and growth performance
This study evaluated the relationship between the temperature–humidity index (THI), health and growth performance of Japanese black calves, by reviewing health data collected from nearly 20,000 calves and 60,000 markets weights.
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Is reticular temperature a useful indicator of heat stress in dairy cattle?
This study confirms that, even in moderate climates, dairy cows are exposed to heat stress.
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Using rumination sensors to monitor heat stress in dairy cows
Heat stress study at farm-level clearly shows the impact of heat stress on rumination and on milk production.
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Reference -
Burgos Zimbelman Rosemarie and Collier Robert J. 2011.
Feeding Strategies for High-Producing Dairy Cows During Periods of Elevated Heat and Humidity. Tri-State Dairy Nutrition Conference pages 111-126.
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Reference -
Collier R. J., Hall L. W., Rungruang S. and Burgos Zimbleman R. 2012.
Quantifying Heat Stress and Its Impact on Metabolism and Performance. Proceedings 2012, 23rd Annual Florida Ruminant Nutrition Symposium pages 74-84