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Forage Testing and Ration Balancing

You cannot judge feed by looking at it. A forage test turns hay or silage into numbers, and ration balancing uses those numbers to match feed to what the cattle actually need.

Why test forage at all

Two bales that look the same can differ widely in protein and energy. Cutting date, species, weather and storage all change feeding value. Without a test, producers tend to overfeed good hay and underfeed poor hay, and the cost shows up in cow condition, calf performance or the feed bill.

A test is cheap compared with the feed it describes.

Testing also helps you sell or buy hay on fair terms. A buyer can ask for a test, and a seller who has one can describe the product honestly. Check with your extension office on common practices in your area rather than assuming a standard.

How to take a good sample

A sample is only as good as how it was taken. Use a probe made for the job, take cores from many bales or loads of the same lot, and mix them into one sample. Keep different fields and cuttings separate. Do not grab a handful from the outside of a stack.

Label the sample with the field, cutting and date, seal it as the lab directs and send it promptly. Ask your county extension office which labs they trust and how to submit.

• Sample each lot separately
• Core a good number of bales instead of one or two
• Keep the sample clean and dry
• Record the lot you sampled

Reading the report

A report typically shows moisture, protein, fiber measures and estimates of energy and, sometimes, minerals and nitrate. Different labs name things in different ways, and some values are estimates calculated from others, so ask for help the first time you read one.

Do not focus on one number. A hay can be high in protein but low in energy, or the other way around. The cattle's needs decide which matters.

What cattle need

Requirements depend on class, size, stage of production, weather and body condition. A dry cow in mid-gestation needs far less than the same cow nursing a calf. Growing cattle and young females have different priorities again. Use body condition scoring on the one to nine scale to see how cattle are really doing, and adjust with your nutritionist.

Weather matters as much as stage. Cold, wet or windy conditions raise needs, and so does heavy milk production, so a ration that worked in fall may need an update in midwinter.

Balancing the ration

Ration balancing means combining feeds so the diet meets the animal's needs without waste. A nutritionist or extension specialist can use your test results to estimate how much hay or silage cattle will eat and where gaps in energy, protein or minerals need filling.

Supplements should fill specific gaps, not be added by habit. Follow label directions on every feed and ask for professional guidance on feeds that carry risk, such as those with non-protein nitrogen or additives.

Keep the ration plan simple enough that the person feeding can follow it every day. A perfect plan that nobody can carry out helps no one, so ask your nutritionist to write down amounts in practical terms for your equipment.

Watching for risks

Tests can also flag problems. Nitrate can build up in stressed forage and cause poisoning, and mold or poor fermentation can make feed unsafe. If a report shows a concern, do not decide on your own how to feed it. Talk to your veterinarian and nutritionist before putting it in front of cattle.

Records and common mistakes

Keep reports, feeding plans and cow condition records together so you can see what worked. Common mistakes include testing only once, mixing lots before sampling, relying on smell and color and changing rations suddenly.

Ask your extension specialist how often to retest and what to do when feed changes. Review the plan at every major change in weather, class of cattle or feed source.

• Test every new lot
• Retest silage after opening a new face
• Keep reports with feeding records
• Adjust slowly after any change

More in Nutrition, Forage & Grazing

• Pasture Management Basics
• Rotational Grazing for Beef Cattle
• Grazing Stocking Rates
• Carrying Capacity Calculations
• Stockpiling Forage for Winter
• Grazing Cover Crops