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Shade material evaluation using a cattle response model and meteorological instrumentation.
Roger A Eigenberg1, Tami M Brown-Brandl, John A Nienaber
1US Meat Animal Research Center, USDA-ARS, Clay Center, NE 68933, USA. roger.eigenberg@ars.usda.gov
Shade structures effectively reduce heat stress in feedlot cattle. Different shade materials, including polyethylene and snow fence, all significantly lowered stress levels compared to no shade.
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Area of Science:
- Agricultural Engineering
- Animal Science
- Environmental Science
Background:
- Feedlot cattle experience heat stress, impacting welfare and productivity.
- Selecting effective shade materials is crucial for mitigating heat stress.
- Quantifiable data on shade material performance is needed for informed selection.
Purpose of the Study:
- To estimate the relative effectiveness of various shade materials in reducing heat stress in feedlot cattle.
- To quantify the impact of different shade structures on thermal load experienced by cattle.
Main Methods:
- Instrumented shade structures (polyethylene cloth: 100%, 60% reflective, 60% black; poly snow fence: ~30% shade) were tested.
- Measurements included solar radiation, black globe temperature, ambient temperature, humidity, and wind speed.
- Data were analyzed using physiological and black globe temperature-based models.
Main Results:
- All tested shade materials significantly reduced the time cattle spent in the highest stress category.
- Significant differences (P < 0.05) were observed between all shade materials and the no-shade control.
- Hourly stress reductions were evident during peak daylight and on full sun days.
Conclusions:
- Shade structures are a viable method for reducing heat stress in feedlot cattle.
- All evaluated shade materials demonstrated effectiveness in mitigating thermal stress.
- Further research can guide optimal shade material selection based on quantified stress reduction.

