Why 25 Heifers Beat 10: Rethinking Replacement Strategy For African Herds
On a cool June morning in Gokwe North, a small herd of heifers drifts through the grass, noses down, tails flicking at flies. Their owner, Mai Ncube, has already made her choice: three neat, big-framed heifers will stay as future breeding cows. The rest will be sold to pay school fees and buy fertiliser. She made that decision at weaning – by eye, by habit, and by guesswork.
Across the world in Missouri, extension specialist Wesley Tucker is asking cattle producers to break that habit. His argument, published by Farm Progress in the United States, is simple but powerful: if you need 10 replacement heifers, you’re better off starting with 25 “heifer candidates” and letting selection pressure – not guesswork – decide which ones stay.
His logic travels well. From commercial beef operations in the American Midwest to communal and A2 farmers in Zimbabwe and across Africa, the principle is the same: you shape the future of your herd by how you pick, and when you cull, your heifers.
Why The Future Of Your Herd Starts With Heifers
Beef cow slaughter in the United States has fallen sharply as producers hold on to older cows for “one more calf”, while selling younger, better-bred heifers because market prices are tempting. Tucker warns that keeping old genetics in less productive cows and selling off the best young animals will eventually drag down herd productivity.
Zimbabwean producers know the pattern. In districts like Nkayi, Mwenezi, and Chiredzi, many families cling to aged cows as a store of wealth, while cashing in younger heifers to cover emergencies. Over time, those decisions quietly shape the herd: smaller frames, weaker fertility, poorer milk for calves.
So the question becomes: if you decide to retain heifers, how do you make sure you are keeping the right ones?
FFA Explainer:
Replacement heifers are young females kept to join or grow the breeding herd. Their genetics, fertility, and longevity determine how productive and profitable the herd will be over the next decade or more.
The Old Way: Picking 10 At Weaning
The conventional approach is familiar on both sides of the Atlantic. A producer decides they need 10 heifer replacements. At weaning, they look over the calves and pick 10 or 11 “nice-looking” heifers – often the biggest and smoothest – to keep.
They then develop a feeding programme to reach a breeding weight that will give good conception rates. The extra one heifer is insurance in case one doesn’t breed. It usually works, but it often means investing heavily in all 10 or 11 from the start.
What it doesn’t answer is the key question: were those really the best heifers for your herd, or just the best on that one day?
Choosing replacements only once, at weaning, is like picking a football team after warm-up and never watching who actually performs during the match.
The New Mindset: 25 Heifer Candidates, Many Off-Ramps
Tucker suggests a mindset shift. If you need 10 replacements, don’t keep 10 or 11. Keep 25 heifer candidates.
“Heifer development should be viewed as an enterprise with multiple off-ramps where candidates are continually scrutinised and culled,” he argues, citing advice from his colleague Jordan Thomas, a beef reproductive physiologist at the University of Missouri.
Instead of betting everything on weaning-day impressions, heifer candidates are evaluated at five critical phases:
- Weaning,
- Pre-breeding reproductive tract scoring,
- Bull turn-in (the breeding period),
- Pregnancy diagnosis, and
- Just before calving.
At each phase, you apply selection pressure. Weak performers exit as sale animals; strong performers move on.
FFA Explainer:
Selection pressure means keeping more candidates than you need, then culling hard based on clear performance criteria. Over time this raises the average quality of your herd, because only the most fertile, best-growing, and soundest animals stay.
Short Breeding Seasons: Let Nature Help You Select
Most herds in the US work with 60- to 90-day breeding seasons for heifers. Tucker recommends something much tighter: 30 days, or even less. That sounds harsh – until you see what it does.
Heifers that conceive in a short breeding window tend to be more fertile and better adapted to your environment. Those that don’t get in calf quickly are sending you a message: they’re less likely to be long-lived, productive cows.
For producers in Zimbabwe and the region, where bulls often run with cows year-round and calving is scattered, the idea of a defined, short breeding season is still new. Yet the benefits are clear: a concentrated calving period, easier management, more uniform calves – and, if applied to heifers, a powerful fertility test.
Why 50% Conception Can Still Be A Win
At a recent heifer retention workshop, Tucker asked producers what conception rate they wanted in their heifer groups. Most said 90% or better. One said 100%.
He then surprised them: he’d be content with only 50% – under the right conditions.
Why? If you’ve kept development costs low and run a tight, 30-day breeding season, a 50% conception rate means nature has done tough selection for you. Half of the heifers proved they can conceive quickly under your management and environmental conditions. Those are gold.
The open heifers are not failures if they can be sold at a profit. They become part of a separate business: growing feeder heifers or finished animals for market.
FFA Explainer:
The key metric is whether value of gain (what the market pays for extra weight) is higher than cost of gain (feed, health, labour). If an open heifer sells for more than her feed and care cost, she has still contributed positively to the business, even if she doesn’t stay in the breeding herd.
Zimbabwe Anchor: How This Could Work In Matabeleland
In Matabeleland South, many communal and small-scale commercial farmers already “over-keep” heifers because they see cattle as savings. But selection tends to be based on colour, docility, or family attachment, not hard performance data.
Imagine a producer in Plumtree who needs five new replacement heifers each year to maintain herd size. Instead of picking those five at weaning, she earmarks 15 heifer calves as candidates. With support from a local veterinary extension officer, she:
- Weighs and scores them at weaning – the lightest or structurally weak heifers are sold early.
- Checks body condition and basic reproductive indicators before the breeding season; any with chronic problems exit.
- Exposes the remaining group to a quality bull for just one cycle (about 21–30 days).
- Sells open heifers at good weights into the feeder market, when prices in Bulawayo or Plumtree are strong.
- Keeps only the early-conceiving, structurally sound heifers as replacements.
Over a few years, her herd becomes younger, more fertile, and better adapted. Calving spreads tighten, calf crops become more uniform, and her marketing options widen. It’s the same principle Tucker describes, tuned to Zimbabwean realities.
Multiple Marketing Off-Ramps, Not One Big Bet
A central part of Tucker’s message is to view heifer development as its own enterprise, with “multiple off-ramps” – each one a chance either to upgrade your herd or to make money.
He points out that spring-born calves weaned in the US autumn often face lower prices during heavy weaner runs. Later in the marketing year, heavy feeder heifers can fetch better prices, especially around August when 845kg open heifers often sell at the yearly high for heavyweight feeders in his market.
The details differ in Zimbabwe, but the pattern is similar. Weaner prices dip when many farmers sell after the main rainy season; heavier, well-grown heifers and steers can command better prices later in the year, especially when feedlots and butcheries are short of stock.
By planning several potential sale points – just after weaning, post-breeding, pre-calving – a farmer can stay flexible. Some heifers will become mothers. Others will pay their way as beef.
Five Critical Checkpoints For Heifer Candidates
Based on Tucker’s framework, heifer candidates should face selection at five stages:
- Weaning: Cull for poor growth, serious structural defects, or health problems. Keep a broad base of sound, functional heifers.
- Pre-breeding assessment: Work with a vet or experienced technician to evaluate reproductive development where possible, and check body condition. Remove obvious late-developers or problem animals.
- Bull turn-in: Use a short breeding season. Heifers that cycle and stand for service early show stronger fertility.
- Pregnancy diagnosis: Any open heifers or very late-conceiving ones leave as sale animals. Early-conceiving heifers move up the list of preferred replacements.
- Pre-calving: Check feet, udders, and temperament. Heifers that have struggled to maintain condition or show structural issues can still be marketed before calving, rather than retained as long-term problems.
Each step is a filter. The more candidates you start with, the more aggressive you can be in culling – and the fitter your final replacements will be.
Costs, Cash Flow, And NDS1
For African producers, the barrier is often cash. Keeping 25 heifer candidates sounds unrealistic when feed is short and capital is tight. Tucker’s point is not to keep more mouths forever, but to think of those animals as a rolling investment, not a static cost.
If every off-ramp is planned, with clear weight and price targets, the system can pay its own way. This aligns with Zimbabwe’s National Development Strategy 1, which calls for more productive, commercialised livestock systems and better use of rangeland and feed resources.
Women and youth, who are increasingly managing small herds or joint ventures, can benefit especially from a more structured system. It turns what is often seen as “luck” – whether a heifer turns out well – into a series of deliberate, measurable decisions.
Simple record-keeping tools and basic heifer nutrition plans can help farmers track growth, breeding dates, and outcomes so that each season improves on the last.
From Missouri To Matobo: The Principle Holds
Wesley Tucker is writing for American ranchers, with American prices and seasons in mind. Yet his core message carries weight in every district where cattle matter more than bank accounts.
Don’t gamble the future of your herd on one look at a weaner pen. Start with more heifer candidates than you think you need. Give them several chances to prove themselves. Let nature, and your own culling discipline, decide who stays.
On that morning in Gokwe, Mai Ncube’s three chosen heifers still look like good bets. But if she had started with 15 candidates and culled steadily based on who bred early, grew well, and stayed healthy, her confidence – and her herd’s future – would rest on more than a glance across the kraal.
That shift, from guessing to guided selection, is where the next generation of Africa’s beef herds will be built.
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