Positive Pressure Tube Ventilation 2015 ANR In-Service Jeremy Daubert Virginia Cooperative Extension Rockingham County Jeremy Daubert- Virginia Cooperative Extension

?Positive Pressure Ventilation? Jeremy Daubert- Virginia Cooperative Extension

Jeremy Daubert- Virginia Cooperative Extension

Not your fathers ventilation Precise hole size Precise hole placement Accurate fan sizing Bring fresh air in Jeremy Daubert- Virginia Cooperative Extension

Cooling vs. Ventilation Designed to Ventilate not Cool Bring Fresh Air into building 4-6 air exchanges per hour, cool weather Designed to complement natural ventilation Run 24hours/ 365days Jeremy Daubert- Virginia Cooperative Extension

Jeremy Daubert- Virginia Cooperative Extension

Cooling? Jeremy Daubert- Virginia Cooperative Extension

Made for Calf Hutches? Jeremy Daubert- Virginia Cooperative Extension

The Concept Naturally Ventilated barns work well for milk cows Why not do the same for calves? Thermal buoyancy! Calves can’t make enough heat to make it work Jeremy Daubert- Virginia Cooperative Extension

Natural Ventilation Jeremy Daubert- Virginia Cooperative Extension

Natural Ventilation Jeremy Daubert- Virginia Cooperative Extension

Natural Ventilation Jeremy Daubert- Virginia Cooperative Extension

Jeremy Daubert- Virginia Cooperative Extension

Developing a PPV system Measure the barn Choose a fan Choose a tube material Design flow Jeremy Daubert- Virginia Cooperative Extension

The PPV Calculator Jeremy Daubert- Virginia Cooperative Extension

Fans Single speed fans Belt drive or direct drive? Hood and cage Need to run at a constant speed Belt drive or direct drive? Hood and cage To protect from objects entering the tube Jeremy Daubert- Virginia Cooperative Extension

How many tubes? Jeremy Daubert- Virginia Cooperative Extension

Type of Tubing? Plastic Woven Vinyl Smooth PVC Drainage pipe Jeremy Daubert- Virginia Cooperative Extension

Air Flow-Where does it go? Larger holes “throw” air further Air slows and widens as soon as it leaves the tubes Goal is to have “still” air at 4 feet off of ground 50 ft/m or less is considered still air Fresh air from tubes mixes with still air at calf level Jeremy Daubert- Virginia Cooperative Extension

Jeremy Daubert- Virginia Cooperative Extension

Key Factors to Respiratory Health Nesting Factor 1-3 Airborne Bacteria Limited nose to nose contact Jeremy Daubert- Virginia Cooperative Extension

Factors to Lower Airborne Bacteria Colder Temperatures More pen area per calf Better air flow Jeremy Daubert- Virginia Cooperative Extension

Nesting Factor Scale of 1-3 Look at how much of the legs are exposed Blankets add 1 to the score Jeremy Daubert- Virginia Cooperative Extension

Jeremy Daubert- Virginia Cooperative Extension

Jeremy Daubert- Virginia Cooperative Extension

Does it Pay? Fan Costs $200-$800 Tube Cost $1-$17 per foot Value of one lost calf $400 Decreased in respiratory disease by about 75% ??? Increase in production as a cow ??? Jeremy Daubert- Virginia Cooperative Extension

References Nordlund, K.V. Positive Pressure Tube Supplementation of Naturally Ventilated Calf Barns. Lago A, McGuirk S, Bennett T, Cook N, Nordlund K. 2006. Calf Respiratory Disease and Pen Microenvironments in Naturally Ventilated Calf Barns in Winter. J. Dairy Sci. 89: 4014–4025. Bates, D.W. and Anderson, J.F. Calculation of Ventilation Needs of Confined Cattle. 1979. JAVMA 174:581--‐589. NRCS Windrose Data Accessed 3/10/2015 http://www.wcc.nrcs.usda.gov/climate/windrose.html Jeremy Daubert- Virginia Cooperative Extension

Virginia Cooperative Extension- Rockingham County Thank You! Jeremy Daubert Virginia Cooperative Extension- Rockingham County jdaubert@vt.edu 540-705-4627 Virginia Cooperative Extension programs and employment are open to all, regardless of age, color, disability, gender, gender identity, gender expression, national origin, political affiliation, race, religion, sexual orientation, genetic information, veteran status, or any other basis protected by law. An equal opportunity/affirmative action employer. Issued in furtherance of Cooperative Extension work, Virginia Polytechnic Institute and State University, Virginia State University, and the U.S. Department of Agriculture cooperating. Edwin J. Jones, Director, Virginia Cooperative Extension, Virginia Tech, Blacksburg; Jewel E. Hairston, Administrator, 1890 Extension Program, Virginia State, Petersburg. Jeremy Daubert- Virginia Cooperative Extension