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Calculating silage requirement
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26-07-2012 8:33pm#1Thought this might be of interest to people who are calculating the silage that they require.
Suckler Cows require 13kg of dry matter feed per day.
Weinlings (300kg) require 7kg of dry matter feed per day.
Here's an example.
A farmer with 20 suckler cows.
5 month winter = 150 days.
Each cow will require 1950kg dry matter feed for the winter.
20 cows will need 39000kg of dry matter feed for the 5 months.
Now, how much dry matter is in a bale:
Well the answer is that it will vairy from farmer to farmer - on how they made their bales.
An example:
A bale of silage which was cut with a conditioner mower at 1pm and baled the next day at 1pm with no rain could have a DM of 30%. The bale weighs 700kg (approx).
Therefore, in that bale there would be 210kg of dry matter.
Therefore you would need approximately 185 of these bales to feed 20 cows for 5 months.
A further example:
An unwilted bale - cut with a conditioner mower, damp when cutting and baled within 2 hours of cutting.
Dry matter could be 20%.
Bale weighs 800kg and has 160kg of dry matter in it.
You would need (39000 / 160) approximately 244 bales for the 5 month winter.
Example 3
Cut with a disc mower on day 1, tedded day 2, rowed on day 3. Dry weather.
3/4 in hay or haylege.
DM of 70%. (Hay has a DM of 85% to 90%
Bale weight 500kg
DM per bale 350kg.
111 bales needed for the 20 cows.
You can't really tell if you have enough silage by just counting the bales. You could supplement silage. Meal or straw can be supplimented as DM - both would have a DM of 95% to 98%.
So the question is, how are you fixed for silage?
Hope this helps some people and that you are able to understand how the figures are worked out.
See, I got a lot from this week's discussion group
16
Comments
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Thought this might be of interest to people who are calculating the silage that they require.
Suckler Cows require 13kg of dry matter feed per day.
Weinlings (300kg) require 7kg of dry matter feed per day.
Here's an example.
A farmer with 20 suckler cows.
5 month winter = 150 days.
Each cow will require 1950kg dry matter feed for the winter.
20 cows will need 39000kg of dry matter feed for the 5 months.
Now, how much dry matter is in a bale:
Well the answer is that it will vairy from farmer to farmer - on how they made their bales.
An example:
A bale of silage which was cut with a conditioner mower at 1pm and baled the next day at 1pm with no rain could have a DM of 30%. The bale weighs 700kg (approx).
Therefore, in that bale there would be 210kg of dry matter.
Therefore you would need approximately 185 of these bales to feed 20 cows for 5 months.
A further example:
An unwilted bale - cut with a conditioner mower, damp when cutting and baled within 2 hours of cutting.
Dry matter could be 20%.
Bale weighs 800kg and has 160kg of dry matter in it.
You would need (39000 / 160) approximately 244 bales for the 5 month winter.
Example 3
Cut with a disc mower on day 1, tedded day 2, rowed on day 3. Dry weather.
3/4 in hay or haylege.
DM of 70%. (Hay has a DM of 85% to 90%
Bale weight 500kg
DM per bale 350kg.
111 bales needed for the 20 cows.
You can't really tell if you have enough silage by just counting the bales. You could supplement silage. Meal or straw can be supplimented as DM - both would have a DM of 95% to 98%.
So the question is, how are you fixed for silage?
Hope this helps some people and that you are able to understand how the figures are worked out.
See, I got a lot from this week's discussion group
Well timed post and good info. I was doing my maths just this evening .
Question. Are you assuming in your calculations that the bales in question are chopped?
I have a mix of four foot and five foot bales all chopped. Some quite wet when baled some reasonably well wilted and drying when baled. I'm getting myself confused in doing my sums!!0 -
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It goes by weight of bale and moisture content as opposed to bale size.Atilathehun wrote: »Thought this might be of interest to people who are calculating the silage that they require.
Suckler Cows require 13kg of dry matter feed per day.
Weinlings (300kg) require 7kg of dry matter feed per day.
Here's an example.
A farmer with 20 suckler cows.
5 month winter = 150 days.
Each cow will require 1950kg dry matter feed for the winter.
20 cows will need 39000kg of dry matter feed for the 5 months.
Now, how much dry matter is in a bale:
Well the answer is that it will vairy from farmer to farmer - on how they made their bales.
An example:
A bale of silage which was cut with a conditioner mower at 1pm and baled the next day at 1pm with no rain could have a DM of 30%. The bale weighs 700kg (approx).
Therefore, in that bale there would be 210kg of dry matter.
Therefore you would need approximately 185 of these bales to feed 20 cows for 5 months.
A further example:
An unwilted bale - cut with a conditioner mower, damp when cutting and baled within 2 hours of cutting.
Dry matter could be 20%.
Bale weighs 800kg and has 160kg of dry matter in it.
You would need (39000 / 160) approximately 244 bales for the 5 month winter.
Example 3
Cut with a disc mower on day 1, tedded day 2, rowed on day 3. Dry weather.
3/4 in hay or haylege.
DM of 70%. (Hay has a DM of 85% to 90%
Bale weight 500kg
DM per bale 350kg.
111 bales needed for the 20 cows.
You can't really tell if you have enough silage by just counting the bales. You could supplement silage. Meal or straw can be supplimented as DM - both would have a DM of 95% to 98%.
So the question is, how are you fixed for silage?
Hope this helps some people and that you are able to understand how the figures are worked out.
See, I got a lot from this week's discussion group
Well timed post and good info. I was doing my maths just this evening .
Question. Are you assuming in your calculations that the bales in question are chopped?
I have a mix of four foot and five foot bales all chopped. Some quite wet when baled some reasonably well wilted and drying when baled. I'm getting myself confused in doing my sums!!0 -
-
Thought this might be of interest to people who are calculating the silage that they require.
Suckler Cows require 13kg of dry matter feed per day.
Weinlings (300kg) require 7kg of dry matter feed per day.
Here's an example.
A farmer with 20 suckler cows.
5 month winter = 150 days.
Each cow will require 1950kg dry matter feed for the winter.
20 cows will need 39000kg of dry matter feed for the 5 months.
Now, how much dry matter is in a bale:
Well the answer is that it will vairy from farmer to farmer - on how they made their bales.
An example:
A bale of silage which was cut with a conditioner mower at 1pm and baled the next day at 1pm with no rain could have a DM of 30%. The bale weighs 700kg (approx).
Therefore, in that bale there would be 210kg of dry matter.
Therefore you would need approximately 185 of these bales to feed 20 cows for 5 months.
A further example:
An unwilted bale - cut with a conditioner mower, damp when cutting and baled within 2 hours of cutting.
Dry matter could be 20%.
Bale weighs 800kg and has 160kg of dry matter in it.
You would need (39000 / 160) approximately 244 bales for the 5 month winter.
Example 3
Cut with a disc mower on day 1, tedded day 2, rowed on day 3. Dry weather.
3/4 in hay or haylege.
DM of 70%. (Hay has a DM of 85% to 90%
Bale weight 500kg
DM per bale 350kg.
111 bales needed for the 20 cows.
You can't really tell if you have enough silage by just counting the bales. You could supplement silage. Meal or straw can be supplimented as DM - both would have a DM of 95% to 98%.
So the question is, how are you fixed for silage?
Hope this helps some people and that you are able to understand how the figures are worked out.
See, I got a lot from this week's discussion group
We covered the exact same topic in our discussion group this week !! I found it helpful although we were told 17kg not 13kg but it's great info if accurate. I am very short based on my sums!0 -
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