Late winter in the Free State is a strange kind of pressure. The veldt looks quiet, but anyone who has been watching the forecasts knows what is building. El Niño affects producers across southern Africa in ways that take time to show up in the books: late rains, shorter growing seasons, pasture that simply does not recover the way it should. By the time the herd is visibly stressed, the margin for correction has already closed.
The smarter response happens now, in the planning phase, before spring planting locks in your forage position for the year.
What El Niño Actually Does to Your Feed Supply
El Niño brings warmer, drier conditions to southern Africa. For dairy producers in KwaZulu-Natal and Mpumalanga, that translates to reduced ryegrass and kikuyu production, shorter silage windows, and maize crops that underperform or fail outright. Pasture-dependent systems take the first hit. Purchased roughage prices follow, because every operator in the region is chasing the same bales at the same time.
The knock-on effect on milk production is well documented. Cows under nutritional stress redirect energy away from lactation. Body condition drops, conception rates fall, and the herd takes months to recover even after feed quality improves. The financial damage from a single poor quarter compounds well into the following season.
What does not get discussed enough is that many of these losses are manageable if the feeding system is tight enough to compensate. That is exactly where a TMR mixer earns its keep.
Why TMR Becomes the Right Tool During Feed Scarcity
When feed is plentiful and cheap, producers can afford a loose approach: good pasture carries the herd, supplementation fills the gaps, and any inefficiency in delivery is hidden by the surplus. Remove that margin and every kilogram of feed has to do more work.
A correctly formulated and consistently delivered total mixed ration does several things that matter more in a drought year than in a normal one. First, it prevents selective eating. Cows offered a mixed ration cannot sort through the trough and reject the roughage in favour of concentrates. Every animal gets the nutrient balance the nutritionist designed, not the one she chose. Second, it stretches lower-quality roughage further. By blending poor-quality dry material with concentrates, minerals, and any available silage, a TMR mixer can produce an acceptable ration from ingredients that would be inadequate on their own. Third, it makes rationing precise. When purchased feed is expensive, knowing exactly how much each group is consuming is not a luxury.
None of that works if the ration separates before it reaches the bunk. The mixing and delivery stages are both part of the same system, and a weak link in either one wastes the effort in the other. There is more on that in this piece on how TMR quality is lost between the mixer and the feed bunk.
Choosing the Right Mixer Capacity for Drought Conditions
Producers who are adding a TMR mixer for the first time often undersize the machine because they calculate against current herd numbers and current ration volumes. That approach ignores two things that drought years make unavoidable: ration density increases when you are compensating for lower-quality roughage, and batch frequency may go up if you are feeding more groups or managing body condition more closely.
Bulk density varies significantly depending on what is in the mix. A ration heavy in long-stem dry material occupies more volume per tonne than one built around silage and concentrates. Size a machine against the lightest ration you expect to run and you will find yourself overfilling when conditions change. The practical guidance on getting that calculation right is covered in detail in this article on choosing the right vertical feed mixer for your operation.
For commercial dairy and feedlot operations running multiple batches per day, a machine with enough capacity to handle peak demand without rushing the mix cycle is what holds ration consistency together. LEO Agriculture’s HD Series runs from 16 to 45 cubic metres and is built specifically for 12 to 18 hour mixing operations where throughput and consistency both matter. The load cells on those machines are rated to 10,000 kg (22,046 lb) each, which matters when you are loading heavy, dense rations under pressure.
Planning Ahead: What the Next 12 Months Look Like
The current El Niño cycle is not a one-season event. Seasonal forecasts suggest that the drier pattern across the summer rainfall regions will persist into the next growing season. Producers who wait for conditions to deteriorate before acting will be ordering equipment into a long queue and paying premium prices for purchased feed at the same time.
The practical steps worth taking now:
- Audit your current roughage inventory and project forward against herd requirements through to next summer’s harvest. Identify the gap before it becomes a crisis.
- Price alternative roughage sources now, including crop residues, distillers’ grains, and any locally available by-products that your nutritionist can work into a ration. A TMR mixer makes those ingredients usable. Without one, most of them are impractical to include consistently.
- If you are supplementing dairy cows through a separate concentrate system rather than a mixed ration, cost out what you are losing to sorting and inconsistent intake. The number is usually larger than expected.
- Consider the lead time on equipment. Machines built in South Africa carry a lead time of around three to four months, which is short relative to many international alternatives. Ordering in late winter puts a unit on-farm before the summer heat and the next silage season.
Nutrients Your Cows Need When Pasture Fails
Dairy cows in early to mid lactation need a ration that holds energy density while maintaining effective fibre for rumen health. When pasture drops out of the system, the energy gap is usually filled with concentrates and the fibre gap with purchased roughage, but the balance is harder to maintain without a mixer. Inconsistent manual feeding means some cows get too much concentrate, some get too little fibre, and rumen acidosis risk climbs.
Protein is the other pressure point. South African drought conditions often coincide with reduced green forage, which removes a significant rumen-degradable protein source. A balanced TMR ration allows the nutritionist to specify bypass protein sources precisely and ensure every cow in the group receives the same formulation.
Minerals and buffers matter more in heat stress conditions too. When ambient temperature climbs and humidity rises, dry matter intake drops and the cow’s acid-base balance shifts. Sodium bicarbonate and other buffers mixed into a TMR ration are distributed evenly across every mouthful. Offered loose, they are ignored by some animals and consumed in excess by others.
The Infrastructure Question
Adding a TMR mixer changes how a dairy farm operates. Feed storage needs to be accessible to the mixer. The feed pad or silage bunker layout matters. Labour patterns shift. None of that is a reason not to proceed, but it is worth working through before the equipment arrives rather than after.
Producers considering the step for the first time should look at what other commercial dairies in their region are running and talk to a dealer who can assess the whole system, not just the mixer in isolation. LEO Agriculture supplies a full vertical feed mixer and manure spreader range through a dealer network that has grown significantly over the past few years, which means local support is more accessible than it was. Details on the full product range are at the LEO Agriculture feed mixer and spreader page.
The underlying point stands regardless of which equipment a producer eventually buys: the operations that come through a drought year with their herd intact and their production numbers defensible are almost always the ones that controlled what they could control. Feed quality is one of those things. In a year when El Niño affects producers from the Free State to the Eastern Cape, that control is worth a great deal.