The Winter Protein Collapse

#A cow can starve in grass up to her belly

Walk a Highveld camp in July. The grass is standing, pale and thick. There is more bulk in front of the herd than there was in December. And the cows are losing condition anyway — a body condition score in six weeks, and by August the thin ones are the ones that will not get in calf next summer.

Nothing is wrong with the quantity. Everything is wrong with the nitrogen.

Below roughly 7% crude protein, rumen-degradable nitrogen becomes the limiting nutrient. The microbes that actually digest fibre cannot multiply fast enough, fibre breakdown slows, the rumen empties more slowly, and voluntary intake falls (Virbac SA; FAO). Dry-season South African veld runs at 2 to 6% crude protein. So the animal is standing in feed she is physically less and less able to eat.

That is the shape of the thing that matters. It is not that the grass is merely poorer, so she gets a bit less out of each mouthful. It is that she takes fewer mouthfuls as the quality drops — a spiral, not a step down. She cannot eat her way out of it.

#Be honest about where the 7% comes from

The 7% threshold and the 2–6% dry-season range come from industry technical material, not from a South African peer-reviewed measurement. The research behind this course went looking for a published South African crude-protein percentage for winter sourveld specifically and could not find one — an earlier draft carried a "roughly 3%" figure that turned out not to be in the source it was attributed to, and it was withdrawn rather than dressed up.

So treat 7% as the working threshold it is: directionally right, universally taught, and worth exactly one forage analysis of your own veld to replace. A sample from your winter reserve camp gives you the actual number for the actual grass your cows are standing in, which no national figure can.

#The season is shorter than the calendar

The reason this lands harder in South Africa than in most of the material a farmer reads online is sourveld.

Sourveld occurs where rainfall exceeds roughly 650 mm on poor, acidic, leached soils with cold winters, and it is palatable and nutritious only while it is actively growing. Once it matures, it goes to bulk. The published figure is that sourveld supplies adequate nutrition for only about 5 to 7 months of the year — and the same source notes that "in some conditions, sourveld only supply enough nutrients for three months of the year" (Voermol). Sweetveld, in the drier and more fertile parts of the country, holds its value into the dry season and can be grazed year-round without condition loss.

Read that as a budget line, because it is one. On sourveld, five to seven months of your feed year arrives free and the rest is a decision you have to fund. That is the whole reason the next lesson but one builds a month-by-month fodder flow.

#The four classes of lick, and what each one is for

South African lick programmes are built around the seasonal shape of what the veld is short of. Published guidance — manufacturer and provincial extension material, so corroborate it against your own veld analysis and a registered nutritionist — sets the target at the level of class and intake, like this (Voermol; NW DARD; Feedtek):

The pattern is worth saying out loud because it surprises people: phosphorus is the summer problem and protein is the winter problem. Farmers routinely run one all-purpose lick all year and are then puzzled that it neither prevents the winter condition slide nor the summer reproduction failure. It is answering the wrong question for half the year in each direction.

Two timing points do most of the work:

• Start the winter protein lick before condition is lost, not after. By the time the cows look thin, the intake spiral has already been running for weeks and you are now paying to recover ground rather than to hold it.
• Never introduce a urea-containing lick to hungry, unaccustomed cattle. That is the classic South African winter mistake, and it is why the transition lick in February to April exists at all — it is as much about accustoming the rumen as about the phosphorus.

#Salt is the tap

The number nobody tells a new farmer is that a lick's job is half nutrition and half intake control, and salt is the control.

On sourveld, cattle over-consume lick, so salt runs at roughly 40% of the supplement to hold intake down to target. On sweetveld, cattle under-consume, so salt drops to 10–25% to keep them coming to the trough (Voermol).

Get that setting wrong and both failure modes cost money.

• Too little salt on sourveld: the herd eats far past target. The winter bill runs 50 or 100% over budget, and the animals may be taking in far more salt in total than they should — the next lesson deals with the sodium chloride ceiling and why over-consumption is a problem in its own right.
• Too much salt on sweetveld: the herd walks away from the trough. You have bought and budgeted the lick and delivered nothing to the animal. The condition slide happens anyway, and it looks like the product failed.

Which means the single most useful thing you can do with a lick programme costs nothing: weigh what goes out and count the animals. Bags out ÷ head ÷ days = actual grams per head per day. If you are not measuring intake, you are not managing a lick programme, you are buying bags.

#Why this course names a target and never a product

You will notice there is not a single formulation in this lesson, and there will not be one anywhere in this course.

That is a legal position, not a stylistic one. Every lick, dip, dose and stock remedy sold in South Africa carries a registration under the Fertilizers, Farm Feeds, Agricultural Remedies and Stock Remedies Act 36 of 1947, and the label is the legal instruction (SAVA). Prescription veterinary medicines fall under the Medicines and Related Substances Act 101 of 1965 instead, and who may do what is governed by the Veterinary and Para-Veterinary Professions Act 19 of 1982.

The practical version: you should walk into the co-op knowing you want a winter protein lick delivering 180–240 g of protein a day at an intake of 400–600 g, on sourveld, for dry pregnant cows — and let the label and the nutritionist tell you which bag does that.

#The biggest number on the farm

Here is the reason this lesson sits at the front of a module about fodder flow rather than in a nutrition appendix.

The Land Bank's Livestock Enterprise Budget 2023/24 (v2) decomposes a 1 000 LSU extensive beef enterprise — 625 cows, 80% weaning, 240 kg weaners — and the cost structure is not what most farmers expect (Land Bank):

Three-quarters of the variable cost is bought feed, and winter lick alone is 55%. The fencing and water infrastructure farmers argue about at every study group is under 1% as an annual repair line.

That is the argument. Every regenerative practice that genuinely extends the grazing season — a deferred camp carried as standing hay, a late-cut reserve, calving shifted so peak cow demand meets spring growth — attacks the single largest number on the income statement. Not the second largest. The largest, by a factor of four over the next line down.

You do not need a soil carbon claim to justify any of it. You need a calendar and a lick ledger.

Before the next lesson, do one thing: find out what your farm actually spent on lick last winter, divide it by the number of animals that ate it, and write the number down. Almost nobody knows it, and it is the number the rest of this module is trying to move.