Frequently we experience very challenging years in terms of hay harvesting and corn silage production. Not only are yields down but the quality of the forage are low for the most part. Many years livestock producers will ask, “Will I have enough forage this year for my livestock?”
This page helps you find the answer to that question.
First you need to determine how much forage you will need this year. This depends on the type of livestock you keep, number of head, age, weight, level of production, etc. Then you need to determine how much forage you have on hand. You need to know the volume of your storage and the density of the forage.
These tables detail forage needs on a hay equivalent basis of 88-90% dry matter; conversion to 35% dry matter silage can be done by multiplying the table contents by 2.6 (90% dry matter hay/35% dry matter silage). Please note Table 1 details TONS of forage required per month and accounts for feeding losses in dry matter. Table 2 details POUNDS of hay per day / month / number of bales per month. An additional 5-15% loss in forage dry matter will occur during storage depending on forage management.
|Table 1. Average Amount of Forage Needed Per Month for Dairy Cows
(Ave. 1,350 lbs.)
0.47 – 0.54 Mcal/lb.
0.55 – 0.59 Mcal/lb.
Over 60 Mcal/lb.
|Forage Needed (Tons)|
|Lbs. 3.5 Fat Corrected Milk|
|Birth – 6 months||0.08||0.09||0.1|
|6 – 14 months||0.19||0.21||0.22|
|14 – 24 months||0.29||0.31||0.33|
|Av./ Heifer / month||0.2||0.22||0.23|
|Source: 1992 Interactive Television Dairy Nutrition Course Notebook, UMCE.|
|Table 2. Approximate Amount of Hay Needed By Animal Unit for all Other Livestock|
|Animal Unit||Pounds of Hay per Day||Pounds of Hay per Month||No. of 40 pound bales per month|
|Table 3. Animal Units
It is assumed that one mature cow represents an animal unit or 1,000 pounds. The comparative feed consumption of other age groups or species of animals determines the proportion of an animal unit that they represent.
|Type of Livestock||Animal Unit|
|Cow, with or without unweaned calf at side||1.0|
|Heifer, 2 years old or older||1.0|
|Bull, 2 years old or older||1.3|
|Young Cattle, 1 to 2 years||0.8|
|Weaned calves to yearling||0.6|
|Light Horse, mature||1.3|
|Light Horse, yearling||1.0|
|Weanling colt or filly||0.75|
|5 Mature ewes, with or without lambs at side||1.0|
|5 Rams, 2 years old or older||1.3|
|5 Weaned lambs or yearlings||0.6|
|Source: Feeds and Nutrition, M.E. Ensminger, J.E. Oldfield, W.W. Heinemann, Ensminger Publishing Co., 1990.|
|Table 4. Hay Shed Capacity
With 20’ High Sidewalls
|Width, Feet||Baled Hay (Tons/Foot of Length)|
|Cu. Ft./ Ton||Lbs./ Cu. Ft.|
|Alfalfa||200 – 330||6 – 10|
|Non-legume||250 - 330||6 – 8|
|Straw||400 – 500||4 – 5|
|Source: Dairy Housing Handbook, MWPS – 7|
|Table 5. Bunker Silo Capacities|
|Average Width||Average Depth of Silage in Bunker|
|8 ft.||12 ft.||16 ft.||20 ft.|
|Tons Dry Matter per One Foot of Length|
|Source: Managing Dairy Feed Inventory, University of Wisconsin, W. T. Howard, V. Wagner, and H. Larsen.|
|Table 6. Round Bale vs. Square Bale|
|Size of Round Bale||Equivalent Number of Square Bales|
|40 lb. Bale||50 lb. Bale||60 lb. Bale|
|4’ Diameter (600 lb.)||15||12||10|
|5’ Diameter (1,000 lb.)||25||20||16-2/3|
|6’ Diameter (1,400 lb.)||35||28||23 -1/3|
|Note: Losses due to weathering can vary from 11% to 44% for round bales left outside|
|Table 7. Approximate Dry Matter Capacities of Tower Silos (Tons)|
|Silo Height (ft)||Silo Diameter (ft)|
|*Capacities allow one foot unused depth for settling in silo up to 30 ft high, and one additional foot for each 10 ft beyond 30 ft height.|
|Source: ASAE (1985) as presented in, Silage and Hay Preservation, NRAES – 5.|
Plan for this Year:
Plan for Next Year:
Prepared by Donna R. Coffin, Extension Educator and Gary Anderson, Extension Specialist, University of Maine Cooperative Extension.
Reviewed by Rick Kersbergen, Extension Educator, Gary Anderson, Extension Specialist and David Marcinkowski, Extension Specialist.
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