Effect of tunnel ventilation and evaporative cooling on the barn enviroment and cow comfort in midwest dairy facilities

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dc.contributor.author Smith, J.F.
dc.contributor.author Harner, Joseph P.
dc.contributor.author Brouk, Michael J.
dc.date.accessioned 2010-11-29T17:52:02Z
dc.date.available 2010-11-29T17:52:02Z
dc.date.issued 2010-11-29
dc.identifier.uri http://hdl.handle.net/2097/6662
dc.description.abstract During the summer of 2001 six tunnel ventilated tie stall barns in northeastern Missouri and southeastern Iowa were evaluated. Three of the barns were equipped with cellulose evaporative pads and three were not. Temperature and relative humidity were recorded continuously for 11 weeks from July 1 to September 15, 2001. Cattle housed in tie stall barns equipped with evaporative cooling had lower average respiration rates (65.7 vs 70.3 breaths/min) than those housed in barns without evaporative cooling. However, rates observed in the morning and at night were not different, only the afternoon rates differed significantly. Average rectal temperatures were also lower for the cows housed in evaporative cooled barns. Similar to respiration rates, the greatest differences existed during the afternoon. Skin temperatures followed respiration rates and rectal temperatures and were significantly lower for the cattle housed in the barns equipped with evaporative cooling with the greatest differences observed during the afternoon. Barns equipped with evaporative cooling pads were up to 8.25ºF cooler during the afternoon hours than those without. However, relative humidity increased up to 30% and THI decreased up to 3.25 units over ambient conditions. As compared to the barns with only tunnel ventilation, barns with evaporative cooling had a greater percentage of July and August hours at a THI level below 70 and eliminated the hours in the 85-90 THI level during the hours of 1:00 PM and 8:00 PM. Evaporative cooling reduced the heat stress during the afternoon hours without increasing the stress during the evening and night hours as compared to the tunnel ventilated barns. This study showed significant advantages for the evaporative cooled and tunnel ventilated barns in terms of respiration rates, rectal temperatures and barn environment. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Diary Day, 2002 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 03-121-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 898 en_US
dc.subject Dairy en_US
dc.subject Heat abatement en_US
dc.subject Facilities en_US
dc.subject Stress en_US
dc.title Effect of tunnel ventilation and evaporative cooling on the barn enviroment and cow comfort in midwest dairy facilities en_US
dc.type Conference paper en_US
dc.date.published 2002 en_US
dc.citation.epage 10 en_US
dc.citation.spage 1 en_US
dc.contributor.authoreid mbrouk en_US
dc.contributor.authoreid jfsmith en_US
dc.contributor.authoreid jharner en_US

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