Restricted feeding — controlling body weight and uniformity
Restricted feeding means managing how much and when birds eat so they hit a target body weight and the flock stays uniform. It’s used mainly in breeder flocks and in rearing pullets — not in commercial broilers, which are fed ad libitum for maximum growth. We explain who needs it, what the methods are and how to run a programme without harming welfare.
verifiedFrom the team that has organised work on poultry farms for years.
Restricted feeding, also called controlled feeding, means deliberately limiting how much feed birds get or when they get it, so they grow along a target body-weight curve. The point isn’t to save on feed, but to keep birds in the right condition and keep the whole flock uniform. It’s a core tool in rearing breeder flocks and future layers — wherever too-fast growth and excess weight spoil later results.
Who does it apply to, and who not?
Restriction is used mainly in broiler-breeder flocks (parent stock) and in rearing pullets destined to become layers. It does not apply to commercial broilers — those are fed ad libitum, with water always available too, because the goal is maximum growth in a short time. Broiler breeders left to eat freely overeat, get too heavy and lose fertility and lay; that’s exactly why their weight has to be controlled from the start of rearing.
Why restricted feeding exists and how it works
Restriction isn’t starving birds to save money — it’s steering the flock along a target weight curve. It’s done responsibly, with care for uniformity and the birds’ welfare.
Why control body weight
The goal is to hit the target body-weight curve recommended by the breeding-line supplier and keep the flock uniform, that is with a low coefficient of variation (CV%). Birds in target condition develop better, reach sexual maturity evenly and enter lay with a good result. A flock that is too heavy or uneven gives poorer fertility, lay and egg quality.
Why broilers are fed ad libitum
A commercial broiler is meant to grow fast, so it gets feed and water ad libitum — restriction would make no sense here, because the aim is maximum gain in a short time. Controlling feed amount starts only where the bird is meant to live long and go into production: in breeders and future layers. It’s the key distinction the whole feeding programme depends on.
Quantitative restriction
The simplest method is limiting the daily feed ration relative to ad libitum feeding. Birds get a weighed portion that lets them grow along the curve but doesn’t let them overeat. It requires accurate feed weighing and fast, even distribution so that every bird gets its share.
Qualitative restriction
The second approach is lowering feed density — less energy and nutrients per kilogram, sometimes with added fibre that gives a feeling of fullness. The bird can eat more volume yet still not gain excessively. Qualitative methods can be gentler on welfare, because they satisfy appetite better than simply cutting the ration.
Time-based programmes
Breeder rearing also uses programmes based on the rhythm of feeding: every day, every other day (skip-a-day) or schemes like 4/3 or 5/2 — feed on some days of the week, a rest on the others. They spread the ration over time and help even out the flock, but must be run in line with the line’s guidelines and welfare rules.
Weighing and flock uniformity
The programme rests on regularly weighing a sample of birds and comparing it with the target curve. On that basis the ration is adjusted, and an uneven flock is split into weight groups (grading) and fed separately to bring the lighter birds up. Clean water must be available at all times, whatever the feeding programme.
How to run a restricted-feeding programme
- 1
Set the target body-weight curve
Start from the breeding-line supplier’s guidelines for the given flock — they give the target body weight for each week of rearing. The curve is the reference for the whole programme: you compare your measurements against it and set rations by it. Without a clear target it’s hard to judge whether the birds are on the right pace.
- 2
Choose the restriction method
Decide whether you limit amount (the ration), quality (feed density) or use a time-based feeding programme. The choice depends on the species, age, flock type and line recommendations. Approaches are often combined — for example a weighed ration of lower-density feed — as long as the programme is consistent and can be run repeatably.
- 3
Weigh feed accurately and distribute it evenly
The ration has to be weighed precisely, because even a small error across the whole flock translates into bird weight. Just as important is fast, even feed distribution so all birds get their share at once. When feed arrives unevenly, the weaker birds fall behind and the flock spreads out.
- 4
Weigh a sample of birds and track uniformity
Regularly weigh a representative sample of birds and compare the average with the target curve. Look not only at the average but also at the spread (CV%) — that’s what tells you whether the flock is uniform. Record the results, because only a series of measurements shows whether the birds are keeping up with the target or the ration needs adjusting.
- 5
Grade the flock by weight if needed
If the weight spread is too large, split the flock into weight groups and feed them separately: give the lighter ones a little more to bring them up to the curve, the heavier ones less. This grading helps even the flock out before it goes into production. Come back to the assessment after further weighings and adjust the groups.
- 6
Mind welfare and water
Restriction must be run responsibly — hunger is a real welfare concern, so reach for qualitative methods, appetite-satisfying fibre in the feed and good management. Clean water should be available at all times. Stick to the breeding-line guidelines and welfare rules, and watching the birds’ behaviour will tell you whether the programme is set up well.
Frequently asked questions about restricted feeding in poultry
Does restricted feeding apply to broilers?add
No. Commercial broilers are fed ad libitum, because the goal is fast, maximum gain in a short time. Restricted feeding is used in broiler-breeder flocks and in rearing pullets for layers — where birds are meant to live long and go into production, and excess weight would spoil fertility and lay.
Why limit birds’ feed at all?add
To hit a target body weight and keep the flock uniform. Broiler breeders left to eat freely overeat, get too heavy and lose fertility and lay. Controlled feeding steers birds along the weight curve recommended by the breeding-line supplier, so the flock enters production in good condition.
What are the methods of restricted feeding?add
Three main approaches: quantitative (limiting the daily ration), qualitative (lower-density feed, sometimes with fibre that gives fullness) and time-based programmes such as every other day (skip-a-day), 4/3 or 5/2. They’re often combined, always in line with the line’s guidelines and welfare rules.
Doesn’t restriction harm bird welfare?add
Hunger is a real welfare concern, which is why restriction must be run responsibly. Qualitative methods, appetite-satisfying fibre in the feed, good management and constant access to clean water all help. You should follow the breeding-line guidelines and welfare rules, and watch the birds’ behaviour as you go.
Record body weights and feed in DlaFerm.pl
In DlaFerm.pl you note bird weighing results and the amount of feed given next to the flock card — it’s then easier to check whether the flock is following the target weight curve. Create a free account or write to us.
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