VENTILATION for highest profits
For profitable meat, milk and egg production, animals need plenty of fresh
air. In fact, adequate supplies of fresh air can lie more important than feed.
For example, researchers nave calculated that, on the average, cattle that eat
50 pounds of feed and drink 100 pounds of water a day need 200 {rounds of
fresn air. laying hens, on the other band, need as much as ten times more air
as feed to maintain production.
Tests have shown that a properly ventilated laying house in this part of
the country can result in hens laying about two extra eggs per month during
the winter. You can also expect about a 5H increase in milk production through
proper ventilation of the dairy bam. Granted, you don’t normally measure air
flow through your buildings in terms of pounds per day per animal. But this
dot's point out how you may profit from doing some figuring on this subject.
Not only will proper ventilation result in better livestock prtiduction but
it can also mean a longer building life. Livestock give off moisture in breathing.
This must be removed from the building or it will condense on walls and
ceilings and speed up decay. In poorly ventiluted buildings you may occa
sionally notice frost or ice on the bottom side of the roof. This is a result of
not providing sufficient ventilation to move out moisture given off by the
animals. Do not overlook such danger signs.
)ust how much moisture do animals breathe out during a 24- hour day?
I, on the average, you can figure 30 dairy cows will produce about two
barrels of water every 24 hours. A hundred hens will breathe about 2H gallons
of water into the air each day. This water must be removed to prevent manage
ment problems, to keep the birds healthy and happy.
Moisture removal becomes more difficult as temperaturts decline. For in
stance air at 30 degrees will absorb only about half as much moisture as air
at 40 to 45 degrees For most efficient operation it's generally best if you can
maintain building temperature at about this latter level. This doesn't neees
sarily mean supplemental heat has to lie added. With sufficient insulation in
the walls and ceiling, animal heat will tend to maintain the building temperature
at near the desired level.
Rate of air exchange needed varies, depending on weather conditions For
instance, for farrowing houses in the summer, an air movement of 150 cubic
feet per minute |x-r sow is ciften recommended. In the winter, however, 30 to
45 cubic feet of air per minute per sow and litter should be sufficient. Make
sure the fans you use can be controlled to give this variation in air movement.
Contrary to popular opinion, fan blade size has little to do with its capacity
to move air. When buying ventilating fans, you’ll note that each is given two
ratings_one is the free delivery rate while the other is based on delivers’
under K inch static pressure. Use the latter figure in selecting the fan. If you
know your air movement needs, you can easily determine the best size of
fan for the job vcni have to perform. Another point, make certain the fan motor
is sealed, has permanently lubricated bearings and built-in overload protection.
If you’re not thoroughly acquainted with ventilation principles, you had
best relv on the advice of ventilation engineers. Additional information may
be obtained from your county agent. While he probably won’t give you specific
engineering advice, he can suggest reputable sources of assistance. Also, the
state agricultural college may be able to send you bulletins and circulars that
can be helpful in answering many of your ventilating questions.
HOW ONE
EXTRA WEANER
MAKES ALL THE OTHERS
COST LESS
You make the biggest headway in weaning more pigs
at less cost per pig when you creep-feed them with
a well-fortified feed containing Aureomycin
Always use a good starter. It is
the most important swine feed
you buy. It determines future
profits. Besides being palatable
and well-fortified, it should be
packed with antibiotic power.
Early and continuous feeding
of this kind of starter feed is the
only proved way hog producers
have found to bring full litters
through the most critical period
-and to turn out more husky
weaners. Pigs need this kind of
feed, need it to be free of scour
ing and "unseen” diseases, need
it to stand up under stress.
One extra weaner saved re
duces the cost of all the other
weaners—pops the feeding costs
for the entire litter!
How Auroomycin reduces
cost per pig
Most hog producers know that
aureomycin* is a "must” in any
V ^ _
pig starter feed. And they know
it must be there in sufficient
quantity. Your feed manufac
turer or feed dealer knows this
too, and is prepared to serve you
with 9 starter feed containing
100 grams of AUREOMYCIN.
aureomycin does the best job
of fighting not just a few, but the
widest variety of disease organ
isms-and, in turn, the best job
of permitting pigs to reach full
growth potential and most effi
cient use of feed.
When you give a starter feed
containing aureomycin, you pro
vide extra protection against
scouring, stress and disease. Your
pigs grow fast and uniformly.
You save those extra weaners.
For best results, continue
feeding a starter past vaccination
(at 6 to 7 weeks) for hog cholera
and erysipelas. AUREOMYCIN
guards against vaccination reac
tion, keeps pigs vigorous.
See your feed manufacturer
Talk to your feed man. Let him
advise you on a breeding-to-mar
ket program for swine that will
pay off for you. American Cyan
amid Company, Agricultural
Division, New York 20, N. Y.
•■AUREOMYCIN is American
Cyanamid Company’s trademark
for chlortetracycline.
These two men are looking
over a new central farrow
ing house. There have been
a number of central houses
built around the country
during the last two or three
years. This trend back to
central farrowing is being
made possible by a better
understanding of the venti
lation needs of this type of
building. Note the central
air duct at the top of this
picture. This is a pressur
ized ventilation system, de
signed to meet the needs of
sows farrowing in these
quarters during all types of
weather. Good ventilation
can eliminate excess mois
ture, reduce disease and
prevent many other prob
lems which have been so
common in the past.
Handling, moving, weaning, vaccina
tion—AVREOMYCIN minimizes reac
tions from these stresses.
kY ^
™ Starter pigs have little trouble with scours and “unseen” diseases
when fed AVREOMYCIN. You save and wean more pigs.
AUREOMYCIN
IN FORMULA FEEDS
CYAN AM II) SERVES THE MAN WHO MAKES A BUSINESS OF AGRICULTURE __
Without some forced venti
lation this stanchion dairy
barn would be like a steam
cabinet during winter. This
particular dairyman uses a
combination of natural and
forced ventilation. Air en
ters the barn through par
tially opened windows
along each side and is ex
hausted through ceiling
fans above the center alley
way. Proper ventilation can
often result in an additional
two pounds of milk daily
from cows that normally
milk 40 pounds.
