Making Grass Silage for Better Returns - Eblex
Making Grass Silage for Better Returns - Eblex
Making Grass Silage for Better Returns - Eblex
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Calculating winter feed rations<br />
14<br />
Work out how much <strong>for</strong>age is available.Then estimate how much is needed to see the animals through<br />
the winter. Fresh weights do not reflect the amount of nutrients in feeds, so focus on dry matter<br />
requirements and availability. Use the following examples to calculate how much silage you have or<br />
need to buy in.<br />
Work out how much silage there is<br />
How big is the clamp?<br />
A B C D E F G<br />
Clamp details (m) Capacity Density<br />
Tonnes<br />
Tonnes<br />
<strong>Silage</strong> type (m3 ) (see<br />
(fresh<br />
DM% (DM)<br />
AxBxC below)<br />
weight) FxG/100<br />
Length Width Height DxE/1000<br />
Eg 1st cut grass 30m 10m 3.5m 1050 615 646 30 194<br />
<strong>Silage</strong> density<br />
DM%<br />
<strong>Grass</strong> <strong>Silage</strong> Maize <strong>Silage</strong><br />
kg Fresh Weight/m<br />
Wholecrop <strong>Silage</strong><br />
3<br />
20 725<br />
25 660 650<br />
30 615 620<br />
35 600 600 605<br />
40 590<br />
45 585<br />
55 565<br />
NB: Density will also depend on chop length, consolidation and depth of silage.<br />
How many tonnes of silage in round bales?<br />
A B C<br />
<strong>Silage</strong> type No. of bales Bale weight (t) DM % Tonnes (DM)<br />
AxBxC/100<br />
Eg 2nd cut grass 400 0.63 30 76<br />
As a guide: 4ft wide round bales = 0.5 tonnes fresh weight. 5ft wide round bales = 0.63 tonnes fresh weight.<br />
How many tonnes of silage are in the field?<br />
A B C<br />
<strong>Silage</strong> type Crop area Expected harvested DM % Tonnes (DM)<br />
(hectares) fresh yield (tonnes/ha) AxBxC/100<br />
Eg 1st cut grass 20 20 25 100
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