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(more fans) probably will not help much. If the birds continue to be very hot, a good tip is to cut back from 3 fans to two fans and consider putting a small amount of water on the pads. A good practice has been to add water to one side of the cool cells (not both sides) and this water should be limited and not continuous.

Some cool cell systems have been installed so that only the first half of the system can be used. This might be an option on some farms. We like to call it tempering the air. Try to regulate the water to the pad to main- tain the desired incoming air temperature. You don’t want to see birds sitting down or crowding together, which they will do when they feel chilled. Also, you don’t want to let the house get cool enough to yo-yo out of tunnel. Consistent, correct temperature is the key. Find the right combination to get the bird heat balance correct so birds are back in their comfort zone, not too warm and not chilled. As evening approaches and outside air temperature drops, get the house back into the vent door power mode of ventilation.

In determining if you are close to the right temperature heat balance combination for a young flock, it is im- portant to realize is that if you cool it off to the point where there are no birds panting at all, you have probably gone too far for the flock as a whole. At the point where 5-10% of birds are panting or close to pant- ing you are pretty close to the right temperature and heat balance. Thanks to the following for their support of Extension poultry engineering, econom- ics and management programs at Auburn University:

One of the old rules of thumb for tunnel management that is still good to know is, “For about 10 degrees F of wind chill cooling turn on the number of tunnel fans equal to bird age in weeks, plus one fan.” For example, 2 week old birds need about 3 tunnel fans in tunnel to feel 10 degrees F of wind chill cooling. Four week old birds need 5 fans. Fan sizes have changed so much in the past 10 years that some modifica- tions of this rule might be necessary to fit some farms.

The take-home point on making young small birds comfortable is that you need to observe birds closely and tweak the air flow (ventilation) and if necessary the air temperature (by cool cell) just enough to get the birds comfortable.

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Platinum DIVERSIFIED / ROTEM ............... 800-348-6663 Pro-Tech, Inc......................www.pro-techinc.com Tabor Group Inc./aglights.com...... 540-989-7383

The Bottom Line

Birds that are not kept comfortable at the beginning of a growout will not get off to a good start. Flocks that do not start well typically do not finish well. Research has consistently shown that lowered weight gain and feed efficiency in the first weeks cannot be made up in later weeks. Used judiciously, tunnel ventilation and evaporative cooling when needed can help flocks get off to a good start even in extremely hot weather.

Gold Atlantic Power Solutions ............... 800-253-1528 Chore-Time ................................... 574-658-4101 LATCO .......................................... 479-824-3282 Multifan/Vostermans Ventilation, Inc.............................. 800-458-5532

Silver Aviagen ......................................... 800-826-9685 CoolAir .......................................... 904-389-1469 Dandy/G&M Sales ........................ 800-222-4166 Detroit Radiant Products Co. .................... www.reverberray.com Double L Group............................. 800-553-4102 DuPont Animal Health Solutions...mark.a.hux@usa.dupont.com Ellison and Ellison......................... 770-427-8929 Alabama Farm Credit.................... 888-305-0074 First South Farm Credit................. 800-955-1722 IVESCO ........................................ 800-643-3064 J&R Builders ................................. 205-594-5994 Lewis Brothers .............................. 912-367-4651 Space Ray .................................... 800-438-4936 VALCO .......................................... 888-345-8956

The Poultry Engineering, Economics and Management Newsletter provides up-to-date information on topics of interest to poultry production personnel, focusing on most effective and efficient uses of modern technology and equipment, with a special emphasis on economic implications. The Newsletter is published six times a year, or as needed to address emerging or special issues. Contact: Jess Campbell, National Poultry Technology Center, 226 Corley Bldg., Auburn University, AL 36849-5626, (334) 844-3546, fax (334) 844-3548, jesscamp@aces.edu. Published by:

Jess Campbell, Program Manager,

Gene Simpson, Professor and

National Poultry Technology Center

Extension Economist

Jim Donald, Professor and

Extension Engineer

Kenneth Macklin, Assistant Profes-

sor and Extension Poultry Scientist

Issued in furtherance of Cooperative Extension work in agriculture and home economics, Acts of May 8 and June 30, 1914, and other related acts, in coopera- tion with the U.S. Department of Agriculture. The Alabama Cooperative Extension System (Alabama A&M University and Auburn University) offers educational programs, materials, and equal opportunity employment to all people without regard to race, color, national origin, religion, sex, age, veteran status or disability.

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