Thank you.
One of the best presentation about poultry ventilation
Congratulation for your work.
Dear sir,
Fan run by airspeed basis or temperature basis in broiler houses explain which one best and why?
Our company have around 45 farms through out Pakistan having different climatic condition.
We have three major thing in mind. Temperature, humidity, & density of birds according to the age.
1-Temperature according to age we can maintain through wind speed, Cooling pads thickness,
number of pads according to requirement & flute angle of pas 45x45 or 45x15, water flow on cooling pads.
2- High Humidity in coastal areas. Here the temperature is important but most important is exchange of total air volume of house as soon as possible that 0.5 to 0,minutes. As if the out side humidity is 80% inside the humidity will be very high.so, we need to expel this air as soon as possible as early you remove the air birds will be comfortable.
Density. In hot & humid areas density of birds play very important roll in these area we have to increase the space per bird at a maximum level it will reduce the temperature as.well as humidity it will reduce the panting & suffocation.It is a very wide subject we can discuss it one by one some other time.Now there are so many types of environmental control devices even you can feed int the whole life of birds environmental requirement it will control according to birds requirement automatically.
Thank you for your valuable time.
It is a nice knowledgeable presentation on control of heat stress.
Ref. to Dr. Danny Hooge's article on the same subject, use of 0.4 to 0.5% Sodium Bicarbonate.
(NaHCo3) in feed can be helpful to control the Respiratory Alkalosis and reduce the losses during high heat time.
I have applied this recommendation in many farms of broilers, particularly naturally ventilated houses and got good results.
Kindly let me know your opinion on this issue, in addition to your recommendations on managemental factors.
Best regards,
Dr. M. Akram, Consultant Microbiologist, Micro Lab. Karachi Pakistan.
Heat stress results in respiratory alkalosis leading to excessive loss of Carbon dioxide due to open mouth breathing. CO2 released comes from two sources 1) breakdown of Carbonic acid and 2) Oxidation of simple sugar (glucose).
Carbonic acid breakdown can be compensated with addition of Sodi bicarb.
Dietary electrolyte balancing will involve optimal addition of salt so that value for Sodium and Chloride correspond the Potassium balance. DEB should be within 170 -250.
Protein catabolism will result in more serious effect, therefore, reduce CP % by 0.5-1%.
Addition of Vit C with osmoregulator will reduce dehydration provided there is continuous cool drinking water supply.
You are right but in some areas of Pakistan, we can only reduce the temperature to 29-30 C with maximum possible ventilation. In this situation, we have to look for the alternatives to combat heat stress.
Under respiratory alkalosis, there is poor calcium metabolism leading to poor shell formation.
The best way to tackle heat stress is to apply cooling strategies like cold water during the heat hours and external cooling effect like fans, water foggers etc. Betaine, Bicarbonates and Vitamin C works within thermoneutral zone. ExternalTemperatures above thermoneutral zones leads to deaths. Decongesting the birds help a lot. Broilers in cages and deep litters are worst hit. Commercial layers survive best in deep litters than in cages. The only problem they have is low performance because of low feed consumption. Here I suggest a deep litter decongesting pen during the heat months. In Nigeria, heat period are from late February to middle May. White coloured layers better survive heat stress. Brown and black heavyweight layers are vulnerable. Black ones are worst vulnerable. The best is the light breed of layers especially the white ones.