Supplement When the Cow Needs It, Not When the Calendar Says So

A lot of ranchers feed supplement because it is November and that is what they do in November. That is how you spend money you did not need to spend. Supplement pays when it fixes a real shortage at a time the cow can use it. The rest is cake that does not get you any more pounds. Here is how to think through it, using extension numbers you can check yourself.

The cow's year is not flat

Utah State Extension's winter supplementation article lays out what an 1,100-pound cow needs by stage. Daily energy and protein run about 14.5 and 2.10 pounds early in lactation, drop to about 9.5 and 1.40 in mid-gestation, and climb back to about 11.2 and 1.60 in late gestation. They say those numbers are adapted from older tables and are for illustration. Still, the shape is clear. The middle of pregnancy is cheap, and the end of it and early lactation are not.

So mid-gestation is when you put weight on a thin cow, and it costs less than doing it after she calves. Our guide on hay math helps you work out what she is eating in the meantime.

Why it matters for next year's calf

Missouri Extension's cow nutrition guide says a cow has to rebreed within about 85 days of calving to keep a 365-day calving interval. It reports an average of about 89 days from calving to cycling at body condition score 3, 70 at score 4, 59 at score 5 and 52 at score 6. A thin cow comes back late, or not at all. Supplement that shows up after calving, when she is already behind, buys you less than the same feed in the fall.

Find out what she is short on

Do not guess. Pull a forage test. Missouri says energy is the usual limit on fescue, and dormant fescue rarely runs under 7 percent protein, so protein cake on fescue mostly does not pay. On dormant warm-season grass or poor hay, protein can be the limit. USU says protein shortage cuts digestibility and intake, and that supplying it can lift intake by about 20 percent. If your forage runs about 50 percent TDN or better and the cows are in decent flesh, protein often fixes most of the energy gap too.

Feed protein less often

Here is a real money saver. Cows recycle nitrogen, so protein does not need to go out every day. USU says every other day or three times a week works for mature cows. A cow needing a pound a day can get about 2.3 pounds three times a week. That saves you a lot of trips, fuel and hours. Energy is different. Feed it more regularly, and be careful with young cows and thin cows, who may need more frequent feeding.

Price it by the pound of nutrient

USU runs illustrative prices: delivered alfalfa near 42 cents per pound of protein, a protein block about $1.22 and a molasses tub about $1.83. Those prices will not be yours, but the lesson holds. A feed that costs more per ton can cost less per pound of protein. Add what it costs you to haul and feed it. Missouri says the same thing: compare by nutrient, not by the bag.

Sort your cows

• First-calf heifers need more and compete less at the feeder.
• Thin cows need a separate feeding program, not a bit more of the same.
• Old cows with worn teeth struggle on rough hay.
• Fat cows in good flesh may not need anything extra.

Feeding the whole herd as if they were all thin is how you waste a ton of supplement. Our cutting cost per cow piece has more on where the money goes.

A plan you can run

1. Condition-score cows at weaning and sort off the thin ones.
2. Test hay and pasture before the cold sets in.
3. Feed only what the test says is short.
4. Go to less frequent feeding for protein.
5. Score again before calving and before breeding.

Watch the cow, not the bag

Body condition is the report card. Walk through the herd every few weeks and look at ribs, hooks and pins. If the cows are holding flesh, you are feeding enough and might be feeding too much. If they are slipping, move early, because it takes far more feed to put weight back on a cow than to keep it on her. A tape and a scoring chart from your extension office will keep you honest about what you see.

Do not skimp on this

Keep minerals out. They are cheap compared with a cow that does not rebreed. The USU article says phosphorus, the big cost in loose mineral, ranges from 4 to 12 percent of the mix, with the higher end for poor hay and dormant range. Read the tag. Farm.fm's page on optimizing feed formulation has more, and agriculture.directory can get you to your extension office. Numbers vary by region and year, so check your own, and watch body condition, which is the best report card you have.