05/02/2025
VACCINATION OF BIRDS OF DIFFERENT AGES WITH A SINGLE BOTTLE OF VACCINE.
When I first started raising birds, I try to program my vaccination such that even when I have 3 sets of birds of different ages and they are 200 in number; I should be able to use 200 doses of vaccine for them.
While it was wise to do, I didn't give so much consideration to the right timing for their vaccination. Timing wasn't even the big issue as I later discovered but mixing ratio.
The mixing ratio for different birds using one vial or bottle of vaccine is the reason for this post.
It is no longer news that you can not use the complete 500 doses of vaccine for 100 birds and expect everything to remain normal just as you can't use 100 doses of vaccine for 200 birds and expect everything thing to continue normally. It means that vaccines actually have doses either an overdose which can happen through a very high concentration of the mixture or an underdose due to a very light concentration of the mixture. Whichever it is, it is not going to give you the desired result.
That was the problem I had for a long time until I realized what accurate mixing ratio is according to the age of birds.
Let us assume I have 200 broilers of 10 days of age meant for vaccination with 200 doses of vaccine. I will use 0.2L of water per day of age for 100 broiler birds which implies 0.4L per day of age for 200 broiler birds. This implies that I will mix the complete 200 doses with 0.4L/day multiplied by 10 days to give 4L of water for 200 doses of vaccine for 200 broilers.
Suppose I have 100 broilers that are 5 days old and need to be vaccinated with a 100 doses of vaccine, I will need 0.1L/day of age. That will be 0.1L/day × 5 days = 0.5L of water to mix 100 doses vaccina for 100 broilers on their fifth day of age.
Let us now assume that I have the following broiler birds at different ages:
1. 50 broilers at 21 days of age
2. 30 broilers at 15 days of age
3. 110 broilers at 10 days of age
4. 20 broilers at 4 days of age.
Now, they all need to take Lasota vaccine on thesame day. They are 200 in number which means I can buy 200 doses of the vaccine.
Will I use the mixing ratio for the youngest or the mixing ratio for the oldest or the ratio for just a time and share amongst them? Doing so will lead to an overdose in some and an underdose in others. Using the ratio for the youngest will mean that the mixture will not be enough to go round while using the mixing ratio for the oldest birds mean that the mixture will be in excess and too light for the younger birds and by implication, an underdose. That was the problem I had for some time leading to vaccine failure and I wouldn't know where the problem was coming from.
This is what to do. Refer again to the list of birds according to age which gives a total number of 200 birds.
I will first determine the needed quantity of water for each set of birds according to their ages. Refer to my earlier post on mixing ratio.
1. 50 broilers at 21 days need 2.1L of water.
2. 30 broilers at 15 days need 0.9L of water.
3. 110 broilers at 10 days need 2.2L of water.
4. 20 broilers at 4 days need 0.16L of water.
With the above known and the water measured out, I will proceed to my vaccine.
With 200 doses of vaccine, I will use my syringe to measure 20ml of water to mix the vaccine. With a 10ml syringe, I will measure two to mix the vaccine. With a 5ml syringe, I will measure four to mix the vaccine.
I will then proceed to mix like this and be guided by the fact that 20ml is for 200 birds which means 1ml is for 10 birds.
Therefore, for
1. 50 broilers at 21 days, I will take 5ml of vaccine to mix 2.1L of water.
2. 30 broilers at 15 days, I will take 3ml of vaccine to mix 0.9L of water.
3. 110 broilers at 10 days, I will take 11ml of vaccine to mix 2.2L of water.
4. 20 broilers at 4 days, I will take 2ml of vaccine to mix 0.16L of water.
Supposing the 20 broilers at 4 days were not part of the birds, it simply means that the left over 2ml vaccine mixture should be disposed properly.
If you think you can not do all these precise calculations, then just use 200ml of water to mix the 200 doses and share as 1ml to a bird.
Where you have 30 birds, you can take 30ml to mix with their water.
Where you can't calculate the water needed as shown above, you can use ⅓ of their daily water consumption.
The above mix ratio as it pertains to water per day of the age of birds is very precise for broilers that are healthy. Where you have other birds like noilers and layers, you can use their average body weight in a flock compared to the weight a broiler would be and use the age of the broiler to work out the water consumption.
If you keep records of their daily water consumption, you can apply the simple rule of thumb of one-third of their daily water intake at that time.
All the best.