Tools for Performing a Feed Inventory Dan Marzu Agricultural - - PowerPoint PPT Presentation

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Jul 10, 2023 117 likes •229 views

Tools for Performing a Feed Inventory Dan Marzu Agricultural Development Educator Lincoln & Marathon Counties Adapted from Brian Holmes, PhD Professor and Extension Specialist Biological Systems Engineering Department UW-Madison

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AGRICULTURE & NATURAL RESOURCES

Tools for Performing a Feed Inventory

Dan Marzu Agricultural Development Educator Lincoln & Marathon Counties

Adapted from Brian Holmes, PhD Professor and Extension Specialist Biological Systems Engineering Department UW-Madison

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AGRICULTURE & NATURAL RESOURCES

Feed Inventory Is the process of determining how much feed is present at a given time

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AGRICULTURE & NATURAL RESOURCES

Why Do a Feed Inventory

Project future needs
Allocate feeds over the year
How much to sell
How much to buy
What to plant
Planning storage needs

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AGRICULTURE & NATURAL RESOURCES

Projecting Feed Needs

Calculate feed available
Calculate herd daily feed need
Calculate number of days feed will last
Determine days of excess/deficiency
Determine quantity to sell/buy or how to

change rotation

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AGRICULTURE & NATURAL RESOURCES

Top Unloading Tower Silo Example

Depth (ft) Quantity Stored (T DM) 10 12 20 33 30 59 40 89 50 123 60 152 70 182

20 ft diameter silo Filled 60 ft high 20 ft remain Height Removed: 60 – 20 = 40 ft Quantity when filled: 152 T DM Quantity removed: 89 T DM Quantity remaining: 152 – 89 = 63 T DM Quantity remaining: 63 / .35 = 180 T AF (assuming 65% moisture)

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AGRICULTURE & NATURAL RESOURCES

Bottom Unloading Tower Silo Example

Depth (ft) Quantity Stored (T DM) 10 12 20 33 30 59 40 89 50 123 60 152 70 182

20 ft diameter silo Filled 60 ft high 20 ft remain Quantity when filled: 152 T DM Quantity remaining: 33 T DM Quantity removed: 152 – 33 = 119 T DM Quantity remaining: 33 / .35 = 94 T AF (assuming 65% moisture)

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AGRICULTURE & NATURAL RESOURCES

The Truth About Silo Tables

Silo table capacities are estimates.
Research shows as much as 20% more feed

can be placed in a tower silo if a good distribution system is used. “When you have a silo table, you know how much feed you have. When you have more than

ne silo table, you are not so sure.”
Brian Holmes

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AGRICULTURE & NATURAL RESOURCES

Bunker Silos

Average height x width x length (in feet) = ft3 Height: 10 feet Width: 36 feet Length: 100 feet 10 ft x 36 ft x 100 ft = 36,000 ft3

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AGRICULTURE & NATURAL RESOURCES

Bunker Silos

Dry weight in bunker:

– 36,000 ft3 x 14 lbs DM/ft3* = 504,000 lb DM – 504,000 lb DM / 2000 lbs = 252 tons DM

As Fed tons based on 65% moisture:

– 252 tons DM / .35 = 720 tons AF

* 14 lbs DM/ft3 is a typical density of silage

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AGRICULTURE & NATURAL RESOURCES

Silo Bags

Diameter Tons of feed/foot

f bag length *

8 ft 1.0 9 ft 1.2 10 ft 1.5 12 ft 2.2

* Based on 65% moisture & 13 lbs/ft3 density

Diameter: 9 ft Length: 75 ft As Fed tons: 1.5 x 75 = 90 tons Dry Matter Tons: 90 tons AF x .35 = 31.5 tons

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AGRICULTURE & NATURAL RESOURCES

Forage Inventory Spreadsheets

http://dairy.wisc.edu/FIT/
Tower silo inventory spreadsheet
Bunker silo inventory spreadsheet
Bag inventory spreadsheet