Poultry production Part 1

What is relative humidity?

The relation between the actual moisture content of the air and the maximum amount of moisture the air can hold at a given temperature

What is psychometrics?

the study of the physical and thermal properties of air and water vapor mixtures

What are the seven physical and thermal properties?

Dry bulb temperature, humidity ratio, relative humidity %, enthapaly, dew point temp, et bulb temp, specific volume.

What is a psychometric chart?

A graphical representation of the seven properties of air.

What is the target inside temperature from fans?

80F

What impacts bird performance more than any other management factor?

ventilation

What is crucial for optimum bird performance?

litter management

For every 20 ° F rise in temperature, the moisture holding capacity increases by how much percent?

50%

When talking about poultry house construction, in the orientation of the house, how should all the houses face to minimize direct sunlight on the house and maximize prevailing winds for ventilation?

east-west (+/- 22 degrees)

What is the R value when a contractor is speaking to you?

material's ability to resist thermal movement through it.

What does U value measure?

the rate of heat transfer

What does the U-value represent?

the transfer of energy through conduction and radiation while R-valueonly represents resistance to heat transfern

Why is the U-value typically a low number?

because it is a rating of how much heat energy is lost or gained

What should the minimum U-value of Chicken House Insulation be?

0\.4

what should the R Value of insulation in a chicken house be?

19

What is the flock super seven?

facility/equipment, feed/water, temperature, litter quality, air quality, sanitation, stress reduction

what 2 of the 7 categories are indirectly affected by ventilation?

stress, sanitation

what 3 of the 7 categories are directly affected by ventilation?

Temperature, air quality, litter quality

What is ventilation?

exchange of air within a house, supplies fresh air, and reduces extremes of temperatures, humidity and air contamination

What is the purpose of ventilation?

Remove excess heat in summer, moisture all year, minimize dust, limit buildup of carbon dioxide and ammonia, and provide oxygen. Venitlaiton effect poultrys breathing so its highly important

Ideal ppm of ammonia-NH3 for chickens?

ideal relative humidity percentage for chickens?

45-65%

Almost all poultry companies are now required to prove to their customers that their production facilities have less than how much ppm at chick placement and during the grow-out?

Birds are homeothermic. What does homeothermic mean?

produce and dissipate heat to maintain a relatively constant body temperature.

What is latent heat?

heat the bird produces

Impact of surplus heat: (heat stress)

Decreased feed consumption and growth rate, Increased water consumption, feed conversion, and mortality

At 0 days old what should the relative humidity %, Temperature for chicks from <30 week old hens, and Temperature for chicks from hens \>30 weeks be?

30-50, 93, 91

As birds grow do minimum ventilation rates are increase or decrease to keep up with increasing moisture production regardless of temperature?

increase

The body temperature of a newly hatched chick?

103\.5

source of heat in a poultry house?

80% birds, 9% ceiling, 8% curtains, 3% other

ideal litter moisture percentage

15-35%

At 21 days old what should the relative humidity %, Temperature for chicks from <30 week old hens, and Temperature for chicks from hens \>30 weeks be?

40-60, 75, 75

At 42 days old what should the relative humidity %, Temperature for chicks from <30 week old hens, and Temperature for chicks from hens \>30 weeks be?

50-70, 64, 64

what type of ventilation do Day old chicks need even with perfect temperature conditions?

Minimum ventilation

what is the minimum contact time

minimum of 15 minutes unless otherwise specified

what is residual effects

how long the product continues to work

what is the easiest microbe to clean?

lipid enveloped viruses

what is the hardest microbe to clean?

Prions