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

2. ?Positive Pressure Ventilation?
Jeremy Daubert- Virginia Cooperative Extension

3. Jeremy Daubert- Virginia Cooperative Extension

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

5. 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

6. Jeremy Daubert- Virginia Cooperative Extension

7. Cooling?
Jeremy Daubert- Virginia Cooperative Extension

8. Made for Calf Hutches?
Jeremy Daubert- Virginia Cooperative Extension

9. 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

10. Natural Ventilation
Jeremy Daubert- Virginia Cooperative Extension

11. Natural Ventilation
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12. Natural Ventilation
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13. Jeremy Daubert- Virginia Cooperative Extension

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

15. The PPV Calculator
Jeremy Daubert- Virginia Cooperative Extension

16. 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

17. How many tubes?
Jeremy Daubert- Virginia Cooperative Extension

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

19. 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

20. Jeremy Daubert- Virginia Cooperative Extension

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

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

23. 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

24. Jeremy Daubert- Virginia Cooperative Extension

25. Jeremy Daubert- Virginia Cooperative Extension

26. 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

27. References
Nordlund, K.V. Positive Pressure Tube Supplementation of Naturally Ventilated Calf Barns. Lago A, McGuirk S, Bennett T, Cook N, Nordlund K 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 JAVMA 174:581--‐589. NRCS Windrose Data Accessed 3/10/2015
Jeremy Daubert- Virginia Cooperative Extension

28. Virginia Cooperative Extension- Rockingham County
Thank You!
Jeremy Daubert
Virginia Cooperative Extension- Rockingham County
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